Journal articles: 'FLOTRAN'

1

Yan, Shi Lin, Yong Jing Lee, De Quan Lee, Fei Yan, and Jun Xia Wang. "The Transverse Permeability’s Simulation of Fiber Tow by FLOTRAN." Advanced Materials Research 1004-1005 (August 2014): 1336–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.1336.

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This paper uses FLOTRAN to estimate the resin flow permeability of fiber tow in RTM. Nine models of different fractions varies from 0.4~0.75 have been built, and the random process of the fiber’s distribution is realized by APDL code. The results show that the dispersion of fiber determines the fluid flow channels, which effect the pressure and velocity’s distribution; the FLOTRAN can be used to estimate the transverse permeability of the fiber bundles.

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Palko, Milan. "Double-Skin Façade in Flotran CFD." Advanced Materials Research 855 (December 2013): 154–59. http://dx.doi.org/10.4028/www.scientific.net/amr.855.154.

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The Aerodynamic simulation with CFD (Computational Fluid Dynamics). Double skin façade as a new segment of modern facades. The fluid flow problem is defined by the laws of conservation of mass, momentum, and energy. Geometrical parameters of element FLUID 141. Aerodynamic mode of double skin façade. Simulation model for inlet and outlet channel of double skin façade. To estimate aerodynamic entrances for inlet and outlet channel of the intermediate space for double skin facades. Aerodynamic and geometrical boundary conditions of the model. Simplified modelling of net for insect with support of real constant.

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Wang, Gang. "Finite Element Simulations of Free Surface Flows With Surface Tension in Complex Geometries." Journal of Fluids Engineering 124, no. 3 (August 19, 2002): 584–94. http://dx.doi.org/10.1115/1.1466458.

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The finite-element program, ANSYS/FLOTRAN, has been enhanced at Release 5.7 to predict free surface flows with surface tension in complex geometries. The two-dimensional incompressible Navier-Stokes and energy equations are solved in both Cartesian and axisymmetric coordinate systems. At Release 5.6, the free surface capabilities have been incorporated into ANSYS/FLOTRAN using the CLEAR-VOF algorithm. The main contribution of this work is to implement a surface tension model into ANSYS/FLOTRAN to study free surface flows with surface tension in complex geometries. Both normal and tangential components of surface tension forces are modeled at the interface through a continuum surface force (CSF) model. This new algorithm is first validated with two model problems: a droplet in equilibrium and an oscillating droplet. For the first problem, the computed pressure value is compared with the theoretical value, whereas for the second problem, the oscillation frequency is compared with both the analytical solution and experimental data. The computer program is then applied to thermocapillary flows in two types of trapezoidal cavities to investigate the interesting flow and heat transfer characteristics. Systematic calculations are performed to study the influence of Marangoni number, capillary number and static contact angle on Marangoni convection.

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马, 月月. "The Liquid Analysis of Deduster Dehydration by ANSYS/FLOTRAN." Mechanical Engineering and Technology 02, no. 04 (2013): 129–33. http://dx.doi.org/10.12677/met.2013.24025.

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Ma, Zhen Yu. "Calculation for Flow Field and Motion of the Missile Capsule in Launching Tube." Applied Mechanics and Materials 52-54 (March 2011): 232–37. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.232.

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Based on interior trajectory calculation of the missile capsule in underwater launching tube，the hydrodynamic pressure distributions of the capsule surface at different moments are simulated carefully by using Flotran module in Ansys software. The results provide some theoretical basis for main body structure design and performance optimization of the underwater capsule.

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An, Xiao Wei, Shu Ping Zheng, and Yu Jie Ji. "Study on Aerodynamic Properties of Impact Plate." Applied Mechanics and Materials 157-158 (February 2012): 970–75. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.970.

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An aero dynamical finite element model on rotary hammering test stand was established in this paper. The external flow field of the model was analyzed by CFD module of ANASYS-FLOTRAN. The distribution of flow velocity and that of flow pressure were obtained, which were analyzed to provide theoretical references for optimum design of impact plate.

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Jin, Jie, Xin Bai, and Fang Yin Ning. "Flow of Finite Element Analysis of Metal Powder in Medal Injection Mold Runner." Advanced Materials Research 189-193 (February 2011): 2255–58. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2255.

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Based on the continuum theory, combined with the characteristics of metal injection molding, constructs assumptions and control equation in the die filling process of MIM.With the FLOTRAN hydro-analysis module of ANSYS software, the melt’s velocity ,temperature and pressure fields during injection molding were simulated and compared for different sizes of circular section runners,and discussed the influences between different diameter runners and injection pressure on the flow behavior of melt. The simulation provided theoretical guidance for the design and selection of mold runner in the production.

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Jin, Jie, and Fang Yan Ning. "Computer Simulation of Melt Flow in Different Gate System for Metal Injection Molding Connecting Shaft." Advanced Materials Research 154-155 (October 2010): 964–68. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.964.

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On the basis of continuous medium theory, computer simulation analysis of metal-powder injection molding was carried out with the help of FLOTRAN hydro-analysis module of ANSYS software. The effects of the gates with different dimension and location were testified. The impact of gate system on the filling process is discussed. The dynamic display of the flow leading edge in the cavity, and temperature field of the melt were researched. A result was obtained that we can modify the design of runner system if we make a full use of existing equipment resource.

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Zhou, Ying, Ming Hui Huang, Da Heng Mao, and Tao Liang. "3-D Coupled Fluid-Thermal Finite Element Analysis of 3C-Style Nozzle’s Fluid Field of Al Roll-Casting." Materials Science Forum 546-549 (May 2007): 741–44. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.741.

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Three-dimensional FEM simulations of fluid-thermal analysis of the fluid fields including the front-box and the 3C-style nozzle of aluminum roll-casting was performed by using FLOTRAN module of ANSYS. The advanced result analysis based on post-processing of ANSYS was conducted by MATLAB. According to the allowable inhomogeneity and its application of velocity and temperature at outlet, the most possible broken regions of aluminum sheets at outlet could be predicted in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet during roll casting.

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MIYATA, Satoshi. "FEM for Researchers and Engineers. Application of CFD to Engineering Problems using FLOTRAN." Journal of the Japan Society for Precision Engineering 62, no. 10 (1996): 1394–97. http://dx.doi.org/10.2493/jjspe.62.1394.

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Ji, Ming Ming, Lin Hua Piao, and Bai Hua Li. "Three-Dimensional Modeling and Simulation for Airflow Inclination Sensor." Advanced Materials Research 268-270 (July 2011): 640–44. http://dx.doi.org/10.4028/www.scientific.net/amr.268-270.640.

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Using ANSYS-FLOTRAN CFD program, the finite element simulation is conducted by a series of procedures, such as three-dimensional model building of airflow inclination sensor, network modifying, loads applying and equation solving. The flow field caused by the two heats in three-dimensional hermetic chamber of sensitive element of airflow level posture sensor is Calculated, FEM analysis has been obtained. The numerical results show that compared with two-dimensional modeling, the simulation result of three-dimensional modeling are more comprehensive and accurate, which provides more reliable basis for practical research of the airflow inclination sensor.

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Yang, Qi Rui, Lin Hua Piao, and Wen Jie Tian. "Research of Micro Airstream Gyroscope Sensitive Mechanism." Advanced Materials Research 889-890 (February 2014): 821–24. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.821.

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The sensitive mechanism of micro airstream gyroscope was explained by calculating the distributing of stream field in the sense organ. According to the real size of micro airstream gyro-scope, ANSYS-FLOTRAN CFD was used to create models and work out the gas flow field and distributing in the two-dimensional chamber with different angular velocities. The results show that while the gyroscope in a static state the gas velocities at both hot-wires are equal as well as the current, and the output voltage is zero. On inputting an angular rate the gas velocities differ and a voltage signal proportional to the input angular rate is achieved.

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Mei, Chuan Zhi, Lin Hua Piao, Quan Gang Yu, Bao Li Zhang, Xia Ding, and Xing Wang. "Study on Improving Resolution of Fluidic Gyroscope." Advanced Materials Research 542-543 (June 2012): 731–34. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.731.

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This paper presents a comparative study to improve the resolution of the fluidic gyro. Using ANSYS-FLOTRAN-CFD software, the finite element simulation has been conducted by series of procedures, such as model building, meshing, loads applying and equation solving, the flow distribution in the sensitive element of the single nozzle and nozzle array fluidic gyro was calculated separately. The results show that the air outlet flow gradient of the array type nozzle increases by 1.1%, the flow velocity difference of symmetrically heat resistance wires in sensitive element increases by 14.3%; the nozzle array structure can effectively improve the resolution of the fluidic gyroscope.

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Zhou, Ying, and Ya Xi Tan. "Simulation of Nine-Spacer Nozzle’s Flow Field of Al Roll-Casting Using Coupled Fluid-Thermal Finite Element Analysis." Advanced Materials Research 159 (December 2010): 697–702. http://dx.doi.org/10.4028/www.scientific.net/amr.159.697.

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A three-dimensional coupled fluid-thermal finite element simulation model has been developed to provide analyzing distribution of velocity and temperature of nine-spacer nozzle by using FEM simulation of FLOTRAN module in ANSYS 6.0. To explore fluid-thermal analysis of the flow fields of nine-spacer nozzle of aluminum roll-casting, stricter analysis of postprocessing result was conducted by MATLAB. It was concluded that flow field of nine-spacer nozzle was able to match cooling capacity of cast rollers, but nine-spacer nozzle’s geometric flaw didn’t suit for working in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet during roll casting.

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Yang, Qi Rui, Lin Hua Piao, and Wen Jie Tian. "Modeling and Simulation of Airflow Level Posture Sensor." Advanced Materials Research 889-890 (February 2014): 838–41. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.838.

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Modeling technology and simulation for micro-mechanical gas-flow level-gesture sensor is explained. Through ANSYS-FLOTRAN CFD program and by means of a series of procedures, such as 3d-modeling, network modifying, loads applying and equation solving, FEM analysis has been obtained. In order to analyze more conveniently and feasibly, By setting up several rational mechanics model schemes and using the method of cutting partial volume modeling, it has saved the massive time and the energy; The skills such as meshed times without number and the key-line meshed in even advanced the veracity and the calculation progress of simulation results.3d-modeling provides a more effective road for optimization of gas-flow level-gesture sensor.

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Zhang, Bao Li, Lin Hua Piao, Quan Gang Yu, Chuan Zhi Mei, Xia Ding, and Xing Wang. "Study on the Improvement of Measurement Range of Fluidic Gyroscope." Advanced Materials Research 542-543 (June 2012): 1065–68. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.1065.

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In this paper we have a comparative study to improve the measurement range of the fluidic gyroscope. Using ANSYS-FLOTRAN CFD software, finite element simulation was conducted by a series of procedures, such as two-dimensional model building, meshing, applied loads and equation solving, we calculated the flow distribution in the sensitive component of fluidic gyroscope with single nozzle and nozzle array. The results show that the upper limit measurement of fluidic gyroscope is the input angular velocity when fluidic column axis deflects to the position of thermistors, and using nozzle array can change the airflow distribution in the sensitive component and achieve the purpose of improving the measurement range of fluidic gyroscope.

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Zhou, Ying, Ci Jun Shuai, and Pei Feng. "A Finite Element Analysis Simulation Model of one-Spacer Nozzle’s Flow Field of Al Roll-Casting Using Coupled Fluid-Thermal Analysis." Advanced Materials Research 159 (December 2010): 691–96. http://dx.doi.org/10.4028/www.scientific.net/amr.159.691.

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To explore fluid-thermal analysis of the flow fields of front-box and One-spacer nozzle of aluminum roll-casting, a three-dimensional finite element simulation model has been developed to provide analyzing distribution of velocity and temperature of outlet of nozzle, by using coupled fluid-thermal FEM simulation of FLOTRAN module in ANSYS 6.0. Stricter analysis of postprocessing result was conducted by MATLAB. It was concluded that flow field of one-spacer nozzle was able to match cooling capacity of cast rollers, and one-spacer nozzle could be optimized to work in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet during roll casting.

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Holder, Anthony W., Philip B. Bedient, and Clint N. Dawson. "FLOTRAN, a three-dimensional ground water model, with comparisons to analytical solutions and other models." Advances in Water Resources 23, no. 5 (February 2000): 517–30. http://dx.doi.org/10.1016/s0309-1708(99)00040-8.

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Ji, Ming Ming, Lin Hua Piao, and Bai Hua Li. "Three-Dimensional FEM Analysis of the Gas Pendulum Characteristic for Airflow Level Posture Sensor." Advanced Materials Research 271-273 (July 2011): 216–19. http://dx.doi.org/10.4028/www.scientific.net/amr.271-273.216.

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Using ANSYS-FLOTRAN CFD program, the finite element simulation is conducted by a series of procedures, such as three-dimensional model building of airflow inclination sensor, network modifying, loads applying and equation solving. The flow field in three-dimensional hermetic chamber of sensitive element of airflow level posture sensor is calculated, FEM analysis has been obtained. The numerical results show that under the buoyancy lift affecting, the direction of nature convection gas always keeps the vertical upward in two-dimensional enclosure, nature convection gas has the pendulum characteristic, and when the dimensional enclosure is inclined, temperature distribution at the several points in dimensional enclosure will change with the tilt angle. The pendulum characteristic can be utilized to measure the level posture by the airflow level posture sensor.

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Ji, Ming Ming, Lin Hua Piao, and Bai Hua Li. "Three-Dimensional FEM Analysis of Effect of Acceleration on Airflow Level Posture Sensor." Advanced Materials Research 271-273 (July 2011): 220–24. http://dx.doi.org/10.4028/www.scientific.net/amr.271-273.220.

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Using ANSYS-FLOTRAN CFD program, the finite element simulation is conducted by means of a series of procedures, such as three-dimensional model building of airflow level posture sensor, network modifying, loads applying equation solving, the flow field in three-dimensional hermetic chamber of sensitive element of airflow level posture sensor in different acceleration and inclination is Calculated, The numerical results show that for the sensor of airflow level posture sensor, the effect of acceleration and inclination is similar. Both of them can change the flow field of sensor, and will output a corresponding voltage. The simulation result of three-dimensional modeling is more comprehensive and accurate, which provides more reliable basis for practical research of the airflow level posture sensor.

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Fracassi da Silva, J. A., R. Furlan, E. W. Simões, M. L. P. Da Silva, and M. T. Pereira. "Simulations of Silicon Microstructure for Preconcentration of Metallic Ions." Journal of Integrated Circuits and Systems 1, no. 2 (November 17, 2004): 13–16. http://dx.doi.org/10.29292/jics.v1i2.258.

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This work presents the simulation results of the fluid flow behavior inside a preconcentrator microstructure. The preconcentrator was implemented in silicon using reactive ion etching, SF6 based, to define the channels and anodic bonding between silicon and borosilicate glass for sealing. The preconcentrator design takes in account the enhancement of surface to area ratio, by dividing the flow until it reaches 50 um channels. The internal flow was analyzed using the commercial package ANSYS/FLOTRAN. Vortex formation was not observed under the simulation conditions and resolution, for water flow of 100 μl/min. The flow is essentially laminar and velocity changes (variations) can be observed, that can influence the residence time of the species inside the microstructure and, consequently, the diffusion/adsorption mechanisms.

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Gendelis, Staņislavs, and Andris Jakovičs. "APPLICATION OF MATHEMATICAL MODELS FOR THE SIMULATION OF THERMAL COMFORT CONDITIONS IN A LIVING ROOM." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (June 18, 2005): 11. http://dx.doi.org/10.17770/etr2005vol1.2124.

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The paper deals with the distributions of temperature and averaged turbulent airflows in living rooms in 2D and 3D approximations using Ansys/Flotran and Ansys/CFX software respectively. The distributions are calculated depending on the placement and temperature of heaters, heat transfer coefficients of the building structures and ventilation conditions. The authors analyse the influence of these factors on the air circulation and the related heat flows through building structures. The thermal balance of a room and its dependence on various external factors is also considered. As thermal comfort conditions’ parameters are analysed, the airflow velocities and indoor temperatures with its gradients. It is shown that it is possible to save heating consumption, at the same time maintaining the conditions of thermal comfort in the room.

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Chen, Jing Bo, Lin Hua Piao, and Pan Pan Yang. "Influence of Thermal Wires Spacing on Fluidic Gyroscope." Advanced Materials Research 753-755 (August 2013): 2700–2703. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2700.

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In this paper, research the influence on spacing thermal wires in the sensitive element of fluidic gyroscope. Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of fluidic gyroscope, meshing, loads applying and equation solving. The two-dimensional airflow distributions of different distances between two thermal wires in sensitive element of fluidic gyroscope are calculated. The results show that, when the angular velocity ωi<20o/s, and the distance between two thermal wires d=4mm, the structure can reduce the velocity of vortex in sensitive element, and increase the thermal wires variation, thus it will increase bridge output voltage, and improve the sensitivity of fluidic gyroscope.

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Chen, Jing Bo, Lin Hua Piao, and Jin Tang. "Finite Element Analysis of Flow Distribution on Nozzle Array Fluidic Gyroscope Performance." Advanced Materials Research 756-759 (September 2013): 4353–56. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4353.

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In this paper, the flow distribution in sensitive element of nozzle array structure gyroscope is analyzed. Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of fluidic gyroscope, mesh, load applying and equation solving. The two-dimensional airflow distributions of nozzle array structure and normal structure gyroscopes are calculated. The results show that the highest velocity of nozzle array structure fluidic gyroscope is 0.71455m/s at the outlet, which is 47.6% of the nozzle velocity, and velocity is increased by 19.5% than the normal nozzle structure. By using nozzle array structure which can reduce velocity of vortex in sensitive cavity, promote airflow movement, increase temperatures changes and improve the sensitivity of fluidic gyroscope.

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Kumar Sinha, Anjani, Eriki Ananda Kumar, and A. Johnrajan. "Flutter Analysis of an Aircraft Wing Using Computational Fluid Dynamics." Applied Mechanics and Materials 754-755 (April 2015): 817–27. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.817.

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In today’s aviation world, the design of aircraft wing becomes a challenging one for aeronautical engineers, in order to meet the aero elastic phenomenon such as flutter, wing divergence in both aerodynamics and structural aspects. There are so many FEM packages available for both flow and structural analysis such as ANSYS, NASTRAN, ALGOR, NISA, ADINA, COSMOS, etc. The paper presents the application of computational aero-elasticity (CA) methods to analyze the wing in both aerodynamic and structural aspects, using ANSYS-FLOTRAN; 2-D typical aerofoil sections were analyzed and validated with experimental results. Also the vibration behavior of wing section is analyzed under MODAL, HARMONIC, TRANSIENT and SPECTRUM analysis under the aerodynamic lift force and moments. The support reaction forces and moments at the fuselage-wing intersection are developed in this research.

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Chen, Jing Bo, Lin Hua Piao, Jing Jing Zhao, and Xia Ding. "Finite Element Analysis of Different Outlet Diameter on Fluidic Gyroscope Performance." Advanced Materials Research 945-949 (June 2014): 1920–23. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.1920.

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In this paper, airflow of two different outlet diameters are analyzed contrastively of fluidic gyroscope. Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of gyroscope, meshing, loads applying and equation solving, and two dimensional airflow distribution of different outlet diameters in sensitive element are calculated. The results show that, velocity at the outlet Vsum=0.53872m/s which diameter of outlet d=3mm, and which is 35.9% of velocity of the inlet, airflow velocity in the outlet increases by 7.4% than d=4mm at the outlet. It accelerates velocity of fluidic beam without any vortex increases in sensitive cavity when d=3mm, and it also increases thermal wires temperature changes and improves the sensitivity of fluidic gyroscope.

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Chen, Jing Bo, Lin Hua Piao, Jing Jing Zhao, and Xia Ding. "Influence of Temperature and Pressure on Nozzle Array Fluidic Gyroscope." Advanced Materials Research 945-949 (June 2014): 2195–98. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.2195.

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In this paper, the temperature and pressure distribution in sensitive element of nozzle array structure gyroscope is analyzed. Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of fluidic gyroscope, mesh, load applying and equation solving. The temperature and pressure distributions of nozzle array structure fluidic gyroscopes are calculated. The results show that the thermal wires heat temperature of the surrounding gas which place at 1.5mm from the outlet, and which produce internal temperature gradient in sensitive cavity, temperature changes symmetry of the cavity center. The pressure near the outlet is higher than any other position in the cavity, and which is 0.21109Pa. In this paper, the structure optimization of nozzle array gyroscope which provides effective theoretical basis for improving its performance.

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Zhang, Bao Li, Lin Hua Piao, Quan Gang Yu, Chuan Zhi Mei, Xia Ding, and Xing Wang. "Influence of the Outlet Aperture of Sensitive Chamber on the Stability of Fluidic Gyroscope." Advanced Materials Research 542-543 (June 2012): 1096–99. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.1096.

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In this paper, influence of the outlet aperture of sensitive chamber on the stability of fluidic gyroscope has been studied. Using ANSYS-FLOTRAN CFD software, the finite element simulation was conducted by a series of procedures, such as two-dimensional model building of fluidic gyro, meshing, loads applying and equation solving, we calculated the airflow distribution in sensitive chamber of fluidic gyro with different outlet apertures. The results show that the airflow would decay and diffuse after it injects into the chamber through nozzle, the bigger the outlet aperture, the smaller the pressure in the outlet-side and the airflow velocity discharged from the outlet, and the more seriously the airflow decay and spread. An effective way to improve the stability and structural optimization of the fluidic gyro output has been studied in this paper.

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Mei, Chuan Zhi, Lin Hua Piao, Quan Gang Yu, Bao Li Zhang, Xia Ding, and Xing Wang. "Study on the Pendulum Characteristic of Nature Convection in Dimensional Enclosure." Advanced Materials Research 542-543 (June 2012): 1120–23. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.1120.

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In this paper, the pendulum characteristic of nature convection gas in dimensional enclosure is analyzed by FEM. Using ANSYS-FLOTRAN CFD program, the stream field and the temperature field caused by the point heat source, when the two-dimensional enclosure is inclined, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving. The results are as follow: (1)Under the buoyancy lift affecting, the direction of nature convection gas always keeps the vertical upward in two-dimensional enclosure, nature convection gas has the pendulum characteristic. (2)When the dimensional enclosure is inclined, temperature distribution at the several points in dimensional enclosure will change with the tilt angle. The pendulum characteristic can be utilized to measure the tilt angle by the gas pendulum tilt sensor.

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Yu, Quan Gang, Lin Hua Piao, and Xing Wang. "FEM Analysis of the Pendulum Characteristic of Nature Convection in Dimensional Enclosure." Advanced Materials Research 505 (April 2012): 195–98. http://dx.doi.org/10.4028/www.scientific.net/amr.505.195.

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In this paper, the pendulum characteristic of nature convection gas in dimensional enclosure is analyzed by FEM. Using ANSYS-FLOTRAN CFD program, the stream field and the temperature field caused by the point heat source, when the two-dimensional enclosure is inclined, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving. The results are as follow: (1)Under the buoyancy lift affecting, the direction of nature convection gas always keeps the vertical upward in two-dimensional enclosure, nature convection gas has the pendulum characteristic. (2)When the dimensional enclosure is inclined, temperature distribution at the several points in dimensional enclosure will change with the tilt angle. The pendulum characteristic can be utilized to measure the tilt angle by the gas pendulum tilt sensor.

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Hao, Hui Di, Tian Qi Cheng, Yong Fang Zhang, Na Zhu, Jian Yong Lei, and Tian Zhai. "Flow Field Analysis of PVC Polymerizer." Advanced Materials Research 884-885 (January 2014): 68–72. http://dx.doi.org/10.4028/www.scientific.net/amr.884-885.68.

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Stirred tank reactor is one of the three typical chemical machinery equipments and widely used in petroleum, chemical, pharmaceutical and other industrial fields .It is the basis of understanding the flow of fluid in stirred tank for optimizing design of reactor. This paper aims at the process of suspension polymerization of polyvinyl chloride (PVC) which is an important raw material of chemical production, and uses conventional design method to design the PVC stirred tank of 50m3 from the structure design. According to the fluid dynamics theory, standard K-E turbulent calculation model is established under the function of impeller, the corresponding boundary conditions are listed, and the grid is carried out successfully. And finally the FLOTRAN CFD software is used to simulate the complex flow field and flow pattern according to the multiple reference frame method.

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Li, Yan Jie, and Lin Hua Piao. "Analysis of the Airflow Tilt Sensor’s Mechanism by Three-Dimensional Finite Element Method." Applied Mechanics and Materials 20-23 (January 2010): 570–74. http://dx.doi.org/10.4028/www.scientific.net/amm.20-23.570.

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The sensitive mechanism of the airflow tilt sensor was analyzed by finite element method. The streamfield caused by heat source, when the three-dimensional enclosure inclining, has been obtained by a series of procedure,such as model building, meshing, loads applying and equation solving. In the process, ANSYS-FLOTRAN CFD program is employed. In horizontal status, the velocity of gas flow is equal at the two thermistor wires; therefore the current of both wires are also equal and the output of the bridge circuit is zero. In tilting status, the velocity difference of gas flow at the two thermistor wires will change with the tilt angle; therefore lead to changing of the current difference of both wires, the bridge outputs avoltage signal corresponding to the tilt angle. This calculation method provides a new approach to optimization of airflow tilt sensors.

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Liu, De Hui, Li Wen Liu, Gang Tang, Hong Min Wen, Ming Xiang Xie, and Quan Guo Lu. "The Numerical Analysis and Simulation of Ni-Ti/Si Shape Memory Alloy Micro Valveless Pump." Applied Mechanics and Materials 496-500 (January 2014): 311–16. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.311.

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In this paper, the characteristics of shape memory alloy (SMA) valveless micro-pump and its work principles are introduced at first. Based on the flow property of diffusion and shrinkage elements, the theory analysis is developed for a valveless micropump, and the flow distribution and pressure variation curve are then achieved with Matlab. Meanwhile, the finite model of the valveless micropump is built by using the ANSYS/FLOTRAN CFD finite element software, and coupled-field simulation analysis is carried out. The effects of different geometry parameters of diffusion and shrinkage elements on the pump performance are simulated and analyzed. The results show the valveless micropump working principle is mainly based on the flow difference of diffusion and shrinkage elements and its output characteristics are related to the geometry parameters. These results are helpful to design the optimal valveless micropump.

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Chen, Jing Bo, Lin Hua Piao, and Jin Tang. "Finite Element Analysis of Nozzle Dimension Influence on Fluidic Gyroscope Performance." Advanced Materials Research 756-759 (September 2013): 4690–93. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4690.

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In this paper, research the influence on nozzle dimension in the sensitive element of fluidic gyroscope. Airflow of two different nozzle dimensions is analyzed contrastively in the sensitive element of fluidic gyroscope. Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of fluidic gyroscope, meshing, loads applying and equation solving. The two dimensional airflow distributions of different nozzle diameters in sensitive element of fluidic gyroscope are calculated. The results show that, compared with large diameter and small diameter nozzle of fluidic gyroscope, airflow velocity in the outlet increases by 10.1%, and 31.3% of velocity in the nozzle in large diameter nozzle. It promotes airflow circulation and reduces airflow accumulation in the sensitive cavity without any vortex increase in large nozzle, it increases thermal wires temperature changes and improves the resolution and sensitivity of fluidic gyroscope.

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Huertas, José Ignacio, and Juan Manuel Caro. "Optimización de los sublimadores de azufre Usados en la industria floricultora mediante simulación numérica en ansys/flotran cfd." Revista de Ingeniería, no. 16 (January 2002): 37–41. http://dx.doi.org/10.16924/revinge.16.5.

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Zhou, Ying. "Coupled Fluid-Thermal Finite Element Analysis of Droplike-Shape-Spacer Nozzle’s Fluid Field of Al Roll-Casting." Advanced Materials Research 129-131 (August 2010): 640–44. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.640.

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A three-dimensional finite element simulation model of fluid field including front-box and droplike-shape-spacer nozzle of aluminum roll-casting has been developed to provide analyzing distribution of velocity and temperature of outlet of nozzle. The computation was performed by using coupled fluid-thermal FEM simulation of FLOTRAN module in ANSYS 6.0. The boundary conditions of the roll-casting model of fluid and thermal fields, were loaded on front-box and nozzle. Based on the data from postprocessing function of ANSYS, the strict result analysis was conducted by MATLAB. Results based on the allowable inhomogeneity of velocity and temperature of outlet show the most possible broken regions of outlet could be predicted in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet. Droplike-shape-spacer nozzle in this example only applied to normal speed, and must be optimized to be appropriate in high roll cast speed.

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Wang, Ya Xuan, Jing Ji, and Shu Zhang. "The Laminar Flow Simulation of Variable Diameter GFRP Pipe with Transition Region." Advanced Materials Research 366 (October 2011): 68–71. http://dx.doi.org/10.4028/www.scientific.net/amr.366.68.

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To investigate the variation rule of fluidic speed in variable diameter GFRP pipe with transition region when the liquid flows through the pipe, the FLOTRAN CFD module of the ANSYS finite element software is adopted to take the laminar flow analysis on 4 diversion pipes with transition region in this paper. The finite element analysis process is introduced in detail, and the velocity vector distribution of the 4 diversion pipes is got. As can be seen from the graph, the velocity of the liquid begins to become quick before the liquid reaches transition region, the velocity of the central liquid is the fastest when the fluid passes the transition zone, the closer the distance is away the wall, the slower the liquid flows, and the distribution is conical basically. 37 degree is recommended in the transition region and it can provide the reference for the turbulent analysis of variable diameter GFRP pipe with transition region.

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Rodrigues, Roberto Jacobe, and Rogério Furlan. "Time-of-Flight Flow Microsensor using Free-Standing Microfilaments." Journal of Integrated Circuits and Systems 4, no. 2 (November 21, 2009): 84–88. http://dx.doi.org/10.29292/jics.v4i2.303.

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In this work we present the processing conditions and the characterization results of a time-of-flight (TOF) flow microsensor implemented using polysilicon microfilaments. Numerical simulation (ANSYS®/FLOTRAN®) and experimental results for analysis with air flow and nitrogen are compared considering different heater to sensor distances and flows. A good agreement was observed between experimental and simulated results. However, experimental TOF values resulted ever consistently higher than the simulated ones due to delays introduced by the circuitry and the data acquisition system and also in the thermal response of the microfilament. Analysis of the heater microfilament reveal that temperatures of the order of 100 °C (that is low enough to not affect the gas flow) can be obtained with a power dissipation of tens of mW. The time-of-flight measurements show that the proposed structure is suitable for the detection of low volumetric flows (tens of SCCM) and presents a response time of the order of milliseconds.

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Chen, Jing Bo, Lin Hua Piao, and Zhi Wei Fan. "Finite Element Analysis of Nozzle Position on Nozzle Array Fluidic Gyroscope Performance." Advanced Materials Research 753-755 (August 2013): 2713–16. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2713.

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In this paper, research the influence on position of vice nozzle in the sensitive element of nozzle array fluidic gyroscope. Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of fluidic gyroscope, meshing, loads applying and equation solving. The two dimensional airflow distributions of different distances between vice nozzle and main nozzle in sensitive element of nozzle array fluidic gyroscope are calculated. The results show that, the distance between vice nozzle and main nozzle l=1.1mm, velocity of airflow at the outlet VSUM=0.71455m/s, and it is 47.6% of the velocity at the inlet, which increases by 1.75% than the distance l=0.5mm. The larger distance between vice nozzle and main nozzle has better convergence trend, it reduces the decay which causes by the airflow propagation, promotes airflow movement and increases temperatures changes without any vortex increase in sensitive cavity, so it can improve the sensitive of fluidic gyroscope.

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Tang, Jin, Lin Hua Piao, Bao Li Zhang, and Jing Bo Chen. "The Comparative Study on Flow Field in Sensitive Element of Fluidic Gyroscope." Advanced Materials Research 756-759 (September 2013): 1455–58. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.1455.

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In this paper, the airflow of two different chamber structures is analyzed contrastively in the sensitive element of fluidic gyroscopes. Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of fluidic gyroscope, meshing, loads applying and equation solving, we calculate the two dimensional airflow distribution of rectangle chamber and streamline chamber in sensitive element of fluidic gyroscope. The results show that the airflow velocity of the exit section in the streamline chamber which is 28.87% of the nozzle velocity is higher than that in the rectangle chamber structure, so the streamline chamber structure brings airflow together to a certain extent, and it also reduces the airflow accumulation in the chamber and smoothes airflow within the loop channel, lastly velocity gradient change in the streamline chamber is greater than that in the rectangle chamber, and the resolution of fluidic gyroscope is better than that with rectangle chamber.

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Zhou, Ying. "Effect of Velocity of Fluid Field of 3-Spacer Nozzle in Roll-Casting Models Using Coupled Fluid-Thermal Finite Element Analysis." Applied Mechanics and Materials 29-32 (August 2010): 1481–87. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1481.

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A finite element model of fluid field of front-box and 3-spacer nozzle of aluminum roll-casting has been developed to provide a comparison of analyzing distribution of velocity and temperature of outlet of nozzle with variable velocity. The computation is performed by using coupled fluid-thermal FEM simulation of FLOTRAN module in ANSYS 6.0. The boundary conditions of the roll-casting model of fluid and thermal fields, were loaded on front-box and nozzle. Based on the postprocessing function of ANSYS, the strict result analysis was conducted by MATLAB. Results based on the allowable inhomogeneity of velocity and temperature of outlet show the most possible broken regions of outlet could be predicted in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet. The profile parameters of the nozzle including distribution, shapes and sizes of the nozzle spacers, and shapes of inner nozzle must be optimized to be appropriate in high roll cast speed.

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Liu, Yong Gang, Xiao Yang Zhang, Jing Yang Zheng, and Jin Fa Xie. "Analyses of Flow Field and Heat Exchange about Limestone Grain in the Preheater." Advanced Materials Research 915-916 (April 2014): 974–77. http://dx.doi.org/10.4028/www.scientific.net/amr.915-916.974.

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According to the structural features of the vertical preheater, the 2-dimention finite element models are set up for the section of the preheater with different arrangement and diameters for the limestone grains. The situation of gas-solid two-phase flow between the limestone grains and the hot air in the preheater is simulated by the discrete particle model. Based on the heat transfer theory, the convection heat transfer coefficient between the limestone grains and the hot air is deduced by means of the experimental correlation of the air cross-flow tube bundles. On the simulation of the 2-dimention finite element model of the vertical preheater based on the FLOTRAN module of ANSYS, the temperature field, pressure field and velocity field of the limestone grains are obtained. The results show that there is a little change of convection heat transfer coefficient by varying the arrangement of limestone grains. The convection heat transfer coefficient is improved by employing the limestone grains with little diameter. The larger the gap between the grains is, the larger the convection heat transfer coefficient is.

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Piao, L. H., Qi Rui Yang, and J. J. Zhao. "Research on Structure of the Airflow Level Posture Sensor." Applied Mechanics and Materials 635-637 (September 2014): 742–45. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.742.

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In this paper, three wire structure of the airflow level posture sensor is described. Using ANSYS-FLOTRAN CFD program, the temperature field and the stream field in sensing element of three wire structure and two wire structure under the effect of the different tilt state, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving. The results are as follow: In tilt status, the airflow rate difference of three wire structure is nearly five times bigger than two wire structure in the two heat sources. Three wire structure makes heating wire separated from detection wire, solves the contradiction between operating current and output sensitivity, and decrease operating current. The test results show: The compare between three wire structure of the airflow level posture sensor and two wire structure of the airflow level posture sensor is that the sensitivity increases from 10 mV /° to 18mV/°,response time decreases from 100mS to 40mS,operating current decreases from 80mA to 40mA, so three wire structure is better than two wire structure.

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Akoz, M. Sami, and M. Salih Kirkgoz. "NUMERICAL AND EXPERIMENTAL ANALYSES OF THE FLOW AROUND A HORIZONTAL WALL-MOUNTED CIRCULAR CYLINDER." Transactions of the Canadian Society for Mechanical Engineering 33, no. 2 (June 2009): 189–215. http://dx.doi.org/10.1139/tcsme-2009-0017.

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The numerical modeling of two-dimensional turbulent flow around a horizontal wall-mounted circular cylinder at Reynolds numbers in the range of 1000≤ReD≤7000 is investigated. Ansys® 10.0-FLOTRAN program package is used to solve the governing equations by finite element method, and the performance of the standard k-ε, standard k-ω and SST turbulence models are examined. A sensitivity study for the three turbulence models is carried out on eight computational meshes with different densities and structures. The computational velocity fields from the present simulations are compared with the experimental results obtained from particle image velocimetry (PIV) measurements for validation purposes. The point of the boundary layer detachment from the cylinder surface and the lengths of primary and secondary separation regions occurring around the cylinder are determined numerically and compared with those obtained experimentally. From these comparisons it is found that the numerical modeling using either of k-ω and SST turbulence models is reasonably successful. Using the results of numerical solutions, the drag and lift coefficients, Cd and Cl, are also calculated and compared with the measured values.

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45

Su, Li Zheng, Le Hua Qi, Ji Ming Zhou, Yu Shan Wang, and Fang Yang. "Numerical Simulation of Heat and Mass Transfer of the Infiltration in Liquid Infiltration Extrusion Process." Materials Science Forum 532-533 (December 2006): 953–56. http://dx.doi.org/10.4028/www.scientific.net/msf.532-533.953.

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The pressure infiltration process of porous preforms by molten metals was investigated numerically in this paper. The finite element model of heat and mass transfer of the infiltration in liquid infiltration extrusion process was founded by the introduction of a new continuum model of fluid in porous medium and a distribution resistance concept. The proposed model can describe the transient flow behavior of semisolid materials qualitatively. Numerical simulations were developed in particular for non-isothermal infiltrations which take into account the thermal aspects (the mould, the fibres and the metal are initially preheated at different temperatures). The temperature distribution, infiltration front and infiltration depth in the infiltration area were gained by the simulation of ANSYS／FLOTRAN code. It is shown that the fiber volume fraction and initial temperature have a strong effect on the infiltration process. The simulation results of axisymmetric infiltration have a good agreement with their experimental ones. In addition, the infiltration time was predicted to get the effective infiltration depth based on the simulation results.

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Rahi, Abbas, Mortaza Shahravi, and Darvish Ahmadi. "The Effects of Airfoil Camber on Flutter Suppression Regarding Timoshenko Beam Theory." Applied Mechanics and Materials 110-116 (October 2011): 1531–38. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.1531.

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The application of Timoshenko beam theory is presented, thereby the effects of airfoil camber can be investigated analytically and numerically by considering rotary inertia and shear deformation in addition to moment of inertia, aerodynamic loading and bending/torsion coupling. Regarding a tuned blisk, the analysis is simplified to a single blade with plunge and pitch DOF. Pressure distribution of the airfoil surfaces and the resulting aerodynamic forces are calculated with ‘ANSYS/FLOTRAN’ during one-cycle time marching at several reduced frequencies. A parametric relation is then achieved by Roger’s approximation including quasi-inertia, quasi-damping, quasi-elastic and lag terms. The final aeroelastic equations are established by bending-torsion and aerodynamics-structure coupling which is solved by state space approach. This procedure is repeated at several free stream velocities until the real component of an eigenvalue equals zero. The latest velocity is the flutter speed. Following this procedure, flutter characteristics of two similar aeroleastic cases are determined considering only one difference in blade configuration; one with cambered and the other with uncambered airfoil. Comparison of these two cases shows the considerable suppression effect of airfoil camber on flutter.

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Khader, S. M. Abdul, Raghuvir Pai, Ganesh Kamath, Mohammed Zuber, and V. R. K. Rao. "Haemodynamic study of Flow in concentric and eccentric stenosed carotid Artery." MATEC Web of Conferences 144 (2018): 01024. http://dx.doi.org/10.1051/matecconf/201814401024.

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Study of flow through arteries is gaining importance in the recent times due to onset of several cardio-vascular diseases like atherosclerosis (block in artery), aneurysms (bulging of artery), hypertension etc. The application of CFD will be useful in demonstrating the underlying mechanism of flow past the diseased arteries. In the present study, initially an approximate eccentric and concentric 50% stenosed carotid model is generated in ANSYS 12.0 based on patient data obtained from ultrasound Doppler scan. Later the percentage of stenosis is increased to 60%, 70%, 80% and 90% in both the cases. A transient analysis has been performed for several pulse cycles in ANSYS FLOTRAN for various percentage cases. The results obtained from ECN and CCN cases are compared to observe the changes in flow behavior in the downstream of stenosis as compared with normal case. The formation of vortices and flow separation zone in downstream in eccentric case is higher than in concentric case. Comparison of results concludes that, with the increase in severity of stenosis, the flow changes abruptly causing an increase in velocity and WSS at throat region. The simulation results obtained agree well with clinically observed data and available literature.

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Ye, Xijun, Zhuo Sun, Xu Cai, and Liu Mei. "An Improved Step-Type Liquid Level Sensing System for Bridge Structural Dynamic Deflection Monitoring." Sensors 19, no. 9 (May 9, 2019): 2155. http://dx.doi.org/10.3390/s19092155.

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Real-time and accurate monitoring of dynamic deflection is of great significance for health monitoring and condition assessment of bridge structures. This paper proposes an improved step-type liquid level sensing system (LLSS) for dynamic deflection monitoring. Layout of straight-line-type pipeline is replaced by step-type pipeline in this improved deflection monitoring system, which can remove the interference of the inclination angle on the measurement accuracy and is applicable for dynamic deflection monitoring. Fluid dynamics are first analyzed to demonstrate that measurement accuracy is interfered with by the fluid velocity induced by structural vibration, and ANSYS-FLOTRAN is applied for analyzing the influence range caused by the turbulent flow. Finally, a step-type LLSS model is designed and experimented with to verify the influence of the three key parameters (initial displacement excitation, step height, and distance from the measurement point to the elbow) on the measurement accuracy, and the reasonable placement scheme for the measurement point is determined. The results show that the measurement accuracy mainly depends on the turbulent flow caused by step height. The measurement error gets smaller after about 1.0 m distance from the elbow. To ensure that the measurement error is less than 6%, the distance between the measurement point and the elbow should be larger than 1.0 m.

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Acevedo-Peñaloza, Carlos Humberto. "Estudio de un modelo de ventilación para un tunel de flujo vehicular." Respuestas 3, no. 1 (June 18, 2016): 7–15. http://dx.doi.org/10.22463/0122820x.661.

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El objetivo principal del estudio es determinar si el modelo de ventilacion axial sin introduccion de aire fresco es adecuado para mantener los niveles decontaminacion en el tunel dentro de los limites permisibles para el ser humano ,para un caso critico de flujo vehicular.Para realizar el estudio se utilizan dos modelos, uno computacional y uno experimental a escala .Para el modelo computacional se utiliza el software de elementos finitos ANSYS-FLOTRAN con el cual se simula tanto el tunel real como el prototipo . El modelo experimental es construido cumpliendo la similitud geometrica ;para el caso de la similitud dinamica se lleva el flujo a regimen turbulento para observar el comportamiento de este cualitativamente y compararlo con el modelo experimental. Los resultados obtenidos con los modelos muestran que , en cada tramo de ventilacion , se presenta recirculacion local cerca del ventilador .En cada zona de recirculacion se presentan dos puntos de estancamiento en los cuales los trazadores utilizados se acumulan. Segun el alcance de las pruebas realizadas se concluye que el sistema de ventilacion propuesto es cualitatvamente bueno, sin embargo amerita un estudio profundo para analizar cuantitativamente el impacto de la recirculacion en la concentracion de contaminantes.Palabras clave: Simulación, contaminación, elementos finitos, túnel.

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Miner, Steven M. "3-D Viscous Flow Analysis of a Mixed Flow Pump Impeller." International Journal of Rotating Machinery 7, no. 1 (2001): 53–63. http://dx.doi.org/10.1155/s1023621x01000057.

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This paper presents the results of a study using a coarse grid to analyze the flow in the impeller of a mixed flow pump. A commercial computational fluid dynamics code (FLOTRAN) is used to solve the 3-D Reynolds Averaged Navier Stokes equations in a rotating cylindrical coordinate system. The standardk-εturbulence model is used. The mesh for this study uses 26,000 nodes and the model is run on a SPARCstation 20. This is in contrast to typical analyses using in excess of 100,000 nodes that are run on a super computer platform. The smaller mesh size has advantages in the design environment. Stage design parameters are, rotational speed 1185 rpm, flow coefficientφ=0.116, head coefficientψ=0.094, and specific speed 2.01 (5475 US). Results for the model include circumferentially averaged results at the leading and trailing edges of the impeller, and analysis of the flow field within the impeller passage. Circumferentially averaged results include axial and tangential velocities, static pressure, and total pressure. Within the impeller passage the static pressure and velocity results are presented on surfaces from the leading edge to the trailing edge, the hub to the shroud, and the pressure surface to the suction surface. Results of this study are consistent with the expected flow characteristics of mixed flow impellers, indicating that small CFD models can be used to evaluate impeller performance in the design environment.

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Journal articles on the topic 'FLOTRAN'

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