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Journal articles on the topic 'CFD study'

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Author: Grafiati

Published: 4 June 2021

Last updated: 10 March 2023

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1

A., Aswandi, B. L. Syaefullah, D. A. Iyai, and M. Jen Wajo. "UTILIZATION OF CARBOHYDRATE POTENTIAL IN VARIOUS KINDS OF BANANA COB FLOUR BANANA IN KACANG GOATS." IRAQI JOURNAL OF AGRICULTURAL SCIENCES 53, no. 4 (August 30, 2022): 732–42. http://dx.doi.org/10.36103/ijas.v53i4.1583.

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The objective of this research was to observe the productivity in kacang goats which were given a complete feed containing flour of various types of banana plant weevils. The material studied in this study was six complete types of feed. Complete feed containing weevil flour from 5 banana plant varieties. Complete feed is prepared with a complete feed composition. The cattle used were 18 male bean goats, mean initial body weight, 15.42 ± 1.98 kg (CV: 13.73%) aged 10-15 months. Livestock is given complete feed containing banana weevil flour for 60 days. The cage is 12 m x 6m in size, construction has a floor platform as high as 140 cm, the enclosure is 1 x 1 m in size and 130 cm in height, equipped with a drinking area. The treatment was in the form of 6 complete types of feed with different formulations, consisting of CF0, CF1, CF2, CF3, CF4, and CF5 containing banana weevil flour with different varieties and control treatment (CF0). The research design used was a completely randomized design with five treatments of complete feed formulas containing hump flour of various banana varieties.The results of the research that the complete feed formulation containing Batu banana hump flour (CF2) and Kapok (CF3) produced the best productivity and performance response of Kacang goat. compared to treatment; CF0 CF1; CF4 and CF5.

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Scheer, Justin K., Jessica Tang, Johnny Eguizabal, Azadeh Farin, Jenni M. Buckley, Vedat Deviren, R. Trigg McClellan, and Christopher P. Ames. "Optimal reconstruction technique after C-2 corpectomy and spondylectomy: a biomechanical analysis." Journal of Neurosurgery: Spine 12, no. 5 (May 2010): 517–24. http://dx.doi.org/10.3171/2009.11.spine09480.

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Object Primary spine tumors frequently involve the C-2 vertebra. Complete resection of the lesion may require total removal of the C-2 vertebral body, pedicles, and dens process. Authors of this biomechanical study are the first to evaluate a comprehensive set of reconstruction methods after C-2 resection to determine the optimal configuration depending on the degree of excision required. Methods Eight human heads (from the skull to C-6) from 4 males and 4 females with a mean age of 68 ± 18 years at death were cleaned of tissue, while leaving ligaments and discs intact. Nondestructive flexion and extension (FE), lateral bending (LB), and axial rotation (AR) tests were conducted using a nonconstraining, pure moment loading apparatus, and relative motion across the fusion site (C1–3) was measured using a 3D motion tracking system. Specimens were tested up to 1.5 Nm at 0.25-Nm intervals for 45 seconds each. The spines were instrumented using 3.5-mm titanium rods with a midline occipitocervical plate (4.0 × 12–mm screws) and lateral mass screws (excluding C-2) at the C-1 (3.0 × 40 mm) and C3–5 levels (3.0 × 16 mm). Testing was repeated for the following configurations: Configuration 1 (CF1), instrumentation only from occiput to C-5; CF2, C-2 corpectomy leaving the dens; CF3, titanium mesh cage (16-mm diameter) from C-3 to C-1 ring and dens; CF4, removal of cage, C-1 ring, and dens; CF5, titanium mesh cage from C-3 to clivus (16-mm diameter); CF6, removal of C-2 posterior elements leaving the C3–clivus cage (spondylectomy); CF7, titanium mesh cage from C-3 to clivus (16-mm diameter) with 2 titanium mesh cages from C-3 to C-1 lateral masses (12-mm diameter); and CF8, removal of all 3 cages. A crosslink was added connecting the posterior rods for CF1, CF6, and CF8. Range-of-motion (ROM) differences between all groups were compared via repeated-measures ANOVA with paired comparisons using the Student t-test with a Tukey post hoc adjustment. A p < 0.05 indicated significance. Results The addition of a central cage significantly increased FE rigidity compared with posterior instrumentation alone but had less of an effect in AR and LB. The addition of lateral cages did not significantly improve rigidity in any bending direction (CF6 vs CF7, p > 0.05). With posterior instrumentation alone (CF1 and CF2), C-2 corpectomy reduced bending rigidity in only the FE direction (p < 0.05). The removal of C-2 posterior elements in the presence of a C3–clivus cage did not affect the ROM in any bending mode (CF5 vs CF6, p > 0.05). A crosslink addition in CF1, CF6, and CF8 did not significantly affect primary or off-axis ROM (p > 0.05). Conclusions Study results indicated that posterior instrumentation alone with 3.5-mm rods is insufficient for stability restoration after a C-2 corpectomy. Either C3–1 or C3–clivus cages can correct instability introduced by C-2 removal in the presence of posterior instrumentation. The addition of lateral cages to a C3–clivus fusion construct may be unnecessary since it does not significantly improve rigidity in any direction.

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3

Wichangarm, Mana, Anirut Matthujak, Thanarath Sriveerakul, Sedthawatt Sucharitpwatskul, and Sutthisak Phongthanapanich. "Simulation Study of LPG Cooking Burner." International Journal of Engineering & Technology 7, no. 3.7 (July 4, 2018): 142. http://dx.doi.org/10.14419/ijet.v7i3.7.16257.

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The objective of this paper is to numerically study the flow feature and combustion phenomena of an energy-saving cooking burner using three-dimensional computational fluid dynamics (CFD). Combustion temperatures were experimentally and numerically investigated in order to not only validate the CFD model, but also describe the combustion phenomena. From the temperature comparison, the CFD model was good agreement with the experiment, having the error of less than 5.86%. Based upon the insight from the CFD model, the high temperature of 1,286 K occurred at the middle of the burner. The high intensive vortex of the flow being enhanced the combustion intensity and the heat transfer coefficient is obvious observed near the burner head inside the ring. Therefore, it is concluded that the burner ring is the major part since it controls flame structure, high temperature region, intensive combustion region, heat loss and suitable flow feature. However, heat transfer to the vessel should be further clarified by the CFD model.

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4

Li, Tingwen, and Chris Guenther. "A CFD study of gas-solid jet in a CFB riser flow." AIChE Journal 58, no. 3 (May 16, 2011): 756–69. http://dx.doi.org/10.1002/aic.12619.

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5

Jørgensen, Rasmus Thy, Gunvor Rossen Tonnesen, Matthias Mandø, and Simon Pedersen. "Comparative Study of CFD and LedaFlow Models for Riser-Induced Slug Flow." Energies 13, no. 14 (July 20, 2020): 3733. http://dx.doi.org/10.3390/en13143733.

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The goal of this study is to compare mainstream Computational Fluid Dynamics (CFD) with the widely used 1D transient model LedaFlow in their ability to predict riser induced slug flow and to determine if it is relevant for the offshore oil and gas industry to consider making the switch from LedaFlow to CFD. Presently, the industry use relatively simple 1D-models, such as LedaFlow, to predict flow patterns in pipelines. The reduction in cost of computational power in recent years have made it relevant to compare the performance of these codes with high fidelity CFD simulations. A laboratory test facility was used to obtain data for pressure and mass flow rates for the two-phase flow of air and water. A benchmark case of slug flow served for evaluation of the numerical models. A 3D unsteady CFD simulation was performed based on Reynolds-Averaged Navier-Stokes (RANS) formulation and the Volume of Fluid (VOF) model using the open-source CFD code OpenFOAM. Unsteady simulations using the commercial 1D LedaFlow solver were performed using the same boundary conditions and fluid properties as the CFD simulation. Both the CFD and LedaFlow model underpredicted the experimentally determined slug frequency by 22% and 16% respectively. Both models predicted a classical blowout, in which the riser is completely evacuated of water, while only a partial evacuation of the riser was observed experimentally. The CFD model had a runtime of 57 h while the LedaFlow model had a runtime of 13 min. It can be concluded that the prediction capabilities of the CFD and LedaFlow models are similar for riser-induced slug flow while the CFD model is much more computational intensive.

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Wu, Yuan Ze, Yi Sun, Hai Tao Shi, and Bai Feng Ji. "Study on Downburst Wind Load under Characteristic Topography." Applied Mechanics and Materials 580-583 (July 2014): 2958–61. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.2958.

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Gemorphological type is the important factor influencing the downburst wind profile. In this thesis, firstly we determine four categories of landform types under the criteria of roughness. The CFD pre-processing software GAMBIT was used to build considering the landscape type's downburst CFD computational model. Then, the established CFD computational model was imported to the calculated hydrodynamics software FLUENT to take the numerical simulation of the downburst under different landforms. Finally, in allusion to the numerical simulation result, make the research of the wind characteristics.

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Al-Yasiri, Mortatha Al-Yasiri, Amthal Al-Gailan Al-Gailan, and Dongsheng Wen Wen. "CFD Study of Cuttings Transport through Vertical Wellbore." Journal of Petroleum Research and Studies 8, no. 3 (May 6, 2021): 158–78. http://dx.doi.org/10.52716/jprs.v8i3.279.

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Cuttings transportation from the bit up the annulus to the surface is one the essentialfunctions that are performed by drilling fluid. Predication of drilling fluid efficiency totransport cuttings in the annulus is very complicated due to numerous parameters that haveaffected drilling operations. Computational Fluid Dynamics (CFD) is widely used as anumerical technique in handling complex multiphase flow problems in differentoperational conditions.The present work has taken the advancement of CFD to computationally analyse theinfluence of the effects of various parameters like drilling fluid rheology, flow rate, piperotation, cuttings density, shape, concentration and drilling fluid- cuttings particle couplingregimes on the cuttings transport in a vertical wellbore. The CFD simulation was carriedout by using transient solver of ANSYS-FLUENT CFD commercial code.The dense discrete phase model (DDPM) is suggested in this work to overcome themain shortcomings of Eulerian–Eulerian and CFD-DEM approaches in simulating drillingfluid-cuttings flow. Also, some of the experimental investigations were involved indetermining the fluid physical properties and essential input data to perform the CFDsimulations. Regarding the results validation and verification, well agreement has beenachieved between results obtained in this study with those reported in other studies

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8

Wang, Chenye, Caifei Ding, Zhoujia Hua, Chunyue Chen, and Jia Yu. "Cangfudaotan Decoction Alleviates Insulin Resistance and Improves Follicular Development in Rats with Polycystic Ovary Syndrome via IGF-1-PI3K/Akt-Bax/Bcl-2 Pathway." Mediators of Inflammation 2020 (November 24, 2020): 1–16. http://dx.doi.org/10.1155/2020/8865647.

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Polycystic ovary syndrome (PCOS) is the most common endocrine and metabolic disorder prevalent in females of reproductive age; insulin resistance (IR) is the major pathogenic driver. Pharmacology is a basic option for PCOS therapy; traditional Chinese medicine (TCM), as a significant part of complementary and alternative medicine, has a long history in the clinical management of PCOS. Cangfudaotan decoction (CFD) has been used clinically for gynaecological diseases especially PCOS. In this study, first, chemical components in CFD were clarified using UPLC-Q/TOF-MS analysis. Then, an animal model of PCOS was established, granular cells were also isolated from the rats with PCOS, and CFD was administrated at different dosages in PCOS rats and granular cells, to investigate the therapeutic effect and mechanisms of CFD for PCOS treatment. The result showed that CFD treatment is effective in PCOS rats and granulosa cells. CFD was able to improve IR, restore the serum hormone levels, inhibit the inflammatory cytokines in PCOS rat, and alleviate ovary morphological injury and apoptosis in PCOS rats. In granulosa cells of PCOS, the result showed that the cell viability was improved, and cell apoptosis was inhibited after CFD administration. Further experiments suggested that CDF improves IR, follicular development, cell apoptosis, and inflammatory microenvironment, and this was associated to the regulation of IGF-1-PI3K/Akt-Bax/Bcl-2 pathway-mediated gene expression. Given that CFD sufficiently suppresses insulin resistance and improves follicular development in this study, exploring these mechanisms might help to optimize the therapeutic treatment of CFD in PCOS patients.

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Kumar, Gaurav, Rohit Kumar, Sagar Dagar, and Raj Kumar Singh. "Comparative Study of Different Missile Shapes using Computational Fluid Dynamics." International Journal of Advance Research and Innovation 8, no. 3 (2020): 72–83. http://dx.doi.org/10.51976/ijari.832012.

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Aerodynamics study using computational fluid dynamics is very famous among the engineers and scientists, because it not only reduces the cost of the entire project but also saves a lot more time. The results of the CFD simulations needed to validate through experiments. So, we can say that CFD simulation studies reduce the no. Of experiments taken, if it cannot eliminate. In this research paper, we made four different aerodynamics missiles shapes CAD models in solid works by using underlying principles, mathematical equations of different curves and engineering judgement, one of them is a missile of standard basic shape. We have analysed and compared them with basic shape of missile. Here, in this study, Volume is taken a constant parameter. Drag Coefficient is the main parameter which is evaluated and studied at different Mach no’s and at a constant angle of attack. Reasons behind the magnificent drop in drag coefficient explained in discussion section.

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10

Masubuchi, Masahiro. "Comparative Study of Mixing Tank Flow between the Continuum CFD and Particle method CFD." Proceedings of The Computational Mechanics Conference 2016.29 (2016): 4_158. http://dx.doi.org/10.1299/jsmecmd.2016.29.4_158.

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11

Ismail, Mohd Azmi, and Mohd Sabri Che Jamil. "CFD HVAC Study of Modular Badminton Hall." CFD Letters 12, no. 7 (July 30, 2020): 90–99. http://dx.doi.org/10.37934/cfdl.12.7.9099.

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12

Macfarlan, Luke H., A. Frank Seibert, Mikey T. Phan, and R. Bruce Eldridge. "CFD-based study on structured packing geometry." Chemical Engineering Science 243 (November 2021): 116767. http://dx.doi.org/10.1016/j.ces.2021.116767.

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Karimpour, A., N. B. Kaye, and A. A. Khan. "CFD Study of Merging Turbulent Plane Jets." Journal of Hydraulic Engineering 137, no. 3 (March 2011): 381–85. http://dx.doi.org/10.1061/(asce)hy.1943-7900.0000308.

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14

Dan, BARBUT, and NEGRUS Eugen Mihai. "CFD analysis for road vehicles - case study." INCAS BULLETIN 3, no. 3 (September 16, 2011): 15–22. http://dx.doi.org/10.13111/2066-8201.2011.3.3.2.

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15

Wee, Siaw Khur, and Yung Jian Yap. "CFD study of sand erosion in pipeline." Journal of Petroleum Science and Engineering 176 (May 2019): 269–78. http://dx.doi.org/10.1016/j.petrol.2019.01.001.

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16

Lo, Sy-Wei, Kuo-Cheng Huang, and Ming-Chai Zhou. "CFD Study on Oil-in-Water Emulsions." Tribology Transactions 52, no. 1 (December 22, 2008): 66–72. http://dx.doi.org/10.1080/10402000802163025.

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Pathak, Vimal Kumar, and Sumit Gupta. "Study of Nozzle Injector Performance Using CFD." International Journal of Recent advances in Mechanical Engineering 4, no. 3 (August 31, 2015): 153–60. http://dx.doi.org/10.14810/ijmech.2015.4312.

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18

Omar, Muhammed Arslan. "COMBI-BOILERS: A COMPARATIVE AND CFD STUDY." Environmental Engineering and Management Journal 21, no. 12 (2022): 2031–42. http://dx.doi.org/10.30638/eemj.2022.179.

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19

Scurtu, I. L., and M. I. Gheres. "Numerical evaluation of vehicles aerodynamics in platoon using CFD simulation." IOP Conference Series: Materials Science and Engineering 1220, no. 1 (January 1, 2022): 012024. http://dx.doi.org/10.1088/1757-899x/1220/1/012024.

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Abstract Due to increased traffic and new technologies developed to improve road safety, a new vehicle driving technique is being studied. The vehicles’ platooning driving method has as objective to minimize the aerodynamic drag and therefore the fuel consumption. The aim of this study is to evaluate the distance between platoon traveling vehicles and to propose an optimal travel distance. The CFD evaluation is performed for two categories of vehicles at a given velocity and distance between them for two cases: in the first simulation scenario, a tractor-trailer is represented, followed by a SUV positioned at a given distance from the rear of the vehicle combination; in the second simulation, two tractor-trailers at the same boundary condition as for the first case are simulated. The vehicles models are made by using a CAD modelling environment, respecting the overall dimensions of an existing vehicle. The numerical evaluation of a distance between vehicle models is performed using the CFD method based on the Navier-Stokes equations averaging. The last part of the paper presents the interpretation of CDF simulation results, establishing the recommended travel distance between vehicles and conclusions of this study.

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Sheng, Ke, Dian Wang, and Li Peng Wang. "The Study on Turbulence Intensity Based on CFD in the Wind Farm." Advanced Materials Research 1008-1009 (August 2014): 144–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.144.

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The turbulence intensity is an important parameter in wind energy resource assessment, and is the main basis of the wind turbine design and equipment shaping. This paper introduces the methods of turbulence intensity calculation, especially the method based on turbulence transport models in CFD. The CFD method of Meteodyn WT is applied to calculate turbulence intensity of wind farm site in complex terrain of some area, and the simulation is compared with measured date by the mast and the simulation based on the line model. The results show that CFD method of Meteodyn WT provides good results of turbulence intensity. It is significant that the CFD method is applied in wind resource assessment and micrositing of wind farm.

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Ridzuan, Nurfairunnajiha, Uznir Ujang, Suhaibah Azri, and Izham Mohamad Yusoff. "Computational Fluid Dynamics of Wind Flow and Air Pollution Modelling: A Review on 3D Building Model Standards." IOP Conference Series: Earth and Environmental Science 1064, no. 1 (July 1, 2022): 012051. http://dx.doi.org/10.1088/1755-1315/1064/1/012051.

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Abstract Computational Fluid Dynamics (CFD) simulations are used to monitor air pollution events supported by real-world conditions digitally. Besides, wind flow that has a close relationship with air pollutants dispersion also can be visualized by using CFD simulation. The presence of a building, especially in terms of the building’s geometry, impacts the air pollution dispersion and wind flow that occur around a building or in a specific research area. As there is an involvement of building models in the simulation, some of the standards for the building modelling: Computer-Aided Design (CAD), City Geographic Markup Language (CityGML), and Building Information Modelling (BIM), are being utilized in this type of study. Many types of research have been conducted to study the pollutants and wind flow using the CFD technique of these three standards. Hence, this review paper is used to presents several pieces of research on this related topic. Through this review paper, some of the drawbacks of the study were identified, such as the detailing of the building’s geometry and the compatibility of each standard to be implemented in the CFD simulation.

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22

van Driel, Michael R. "Cardioplegia heat exchanger design modelling using computational fluid dynamics." Perfusion 15, no. 6 (December 2000): 541–48. http://dx.doi.org/10.1177/026765910001500611.

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A new cardioplegia heat exchanger has been developed by Sorin Biomedica. A three-dimensional computer-aided design (CAD) model was optimized using computational fluid dynamics (CFD) modelling. CFD optimization techniques have commonly been applied to velocity flow field analysis, but CFD analysis was also used in this study to predict the heat exchange performance of the design before prototype fabrication. The iterative results of the optimization and the actual heat exchange performance of the final configuration are presented in this paper. Based on the behaviour of this model, both the water and blood fluid flow paths of the heat exchanger were optimized. The simulation predicted superior heat exchange performance using an optimal amount of energy exchange surface area, reducing the total contact surface area, the device priming volume and the material costs. Experimental results confirm the empirical results predicted by the CFD analysis.

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Li, Ruige, Yanru Wang, Hongjian Lin, Hai Du, Chunling Wang, Xiaosu Chen, and Mingfeng Huang. "A Mesoscale CFD Simulation Study of Basic Wind Pressure in Complex Terrain—A Case Study of Taizhou City." Applied Sciences 12, no. 20 (October 17, 2022): 10481. http://dx.doi.org/10.3390/app122010481.

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The basic wind pressure or the reference wind pressure for structural design varies greatly across complex terrain. Since only a few meteorological stations can provide adequate extreme wind speed records, it is very difficult to appropriately determine the basic wind pressure for a specific site without a long history of meteorological records. To solve this problem, a mesoscale CFD model was developed and optimized based on geographic information data for Taizhou and suitable turbulence models were selected for CFD simulation. The mean extreme wind speed and the corresponding direction at five main weather stations with long observation histories in Taizhou were used as the verification conditions to perform the CFD simulation of the extreme wind field. The maximum wind speeds of the rural areas, cities, and streets of Taizhou were obtained from the results of the mesoscale CFD simulations. Then, the 50-year return period reference wind pressures were calculated and could be used for the wind-resistant structural design of buildings for sites without a long history of meteorological records. The reliability of the results was verified by comparing the simulation results with the observation data at five main stations with a long history.

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24

Gonzales, Howell B., John Tatarko, Mark E. Casada, Ronaldo G. Maghirang, Lawrence J. Hagen, and Charles J. Barden. "Computational Fluid Dynamics Simulation of Airflow through Standing Vegetation." Transactions of the ASABE 62, no. 6 (2019): 1713–22. http://dx.doi.org/10.13031/trans.13449.

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Abstract. Maintaining vegetative cover on the soil surface is the most widely used method for control of soil loss by wind erosion. We numerically modeled airflow through artificial standing vegetation (i.e., simulated wheat plants) using computational fluid dynamics (CFD). A solver (simpleFoam within the OpenFOAM software architecture) was used to simulate airflow through various three-dimensional (3D) canopy structures in a wind tunnel, which were created using another open-source CAD geometry software (Salomé ver. 7.2). This study focused on two specific objectives: (1) model airflow through standing vegetation using CFD, and (2) compare the results of a previous wind tunnel study with various artificial vegetation configurations to the results of the CFD model. Wind speeds measured in the wind tunnel experiment differed slightly from the numerical simulation using CFD, especially near positions where simulated vegetation was present. Effective drag coefficients computed using wind profiles did not differ significantly (p <0.05) between the experimental and simulated results. Results of this study will provide information for research into other types of simulated stubble or sparse vegetation during wind erosion events.HighlightsMeasured airflow through a simulated canopy was successfully modeled using CFD software.Effective drag coefficients did not differ between the experimental and simulated results.Results of this study provide 3-D simulation data of wind flow through a plant canopy. Keywords: 3-D canopy structure, OpenFOAM, Wind erosion, Wind tunnel studies.

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Park, Donggeun, and Jong-Hyeon Lee. "Feasibility Evaluation of Computational Fluid Dynamics Approach for Inhalation Exposure Assessment: Case Study for Biocide Spray." Applied Sciences 11, no. 2 (January 11, 2021): 634. http://dx.doi.org/10.3390/app11020634.

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Consumer products contain chemical substances that threaten human health. The zero-dimensional modeling methods and experimental methods have been used to estimate the inhalation exposure concentration of consumer products. The model and measurement methods have a spatial property problem and time/cost-consuming problem, respectively. For solving the problems due to the conventional methodology, this study investigated the feasibility of applying computational fluid dynamics (CFD) for the evaluation of inhalation exposure by comparing the experiment results and the zero-dimensional results with CFD results. To calculate the aerosol concentration, the CFD was performed by combined the 3D Reynolds averaged Navier–Stokes equations and a discrete phased model using ANSYS FLUENT. As a result of comparing the three methodologies performed under the same simulation/experimental conditions, we found that the zero-dimensional spray model shows an approximately five times underestimated inhalation exposure concentration when compared with the CFD results and measurement results in near field. Additionally, the results of the measured concentration of aerosols at five locations and the CFD results at the same location were compared to show the possibility of evaluating inhalation exposure at various locations using CFD instead of the experimental method. The CFD results according to measurement positions can rationally predict the measurement results with low error. In conclusion, in the field of exposure science, a guideline for exposure evaluation using CFD, was found that complements the shortcomings of the conventional methodology, the zero-dimensional spray model and measurement method.

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Park, Donggeun, and Jong-Hyeon Lee. "Feasibility Evaluation of Computational Fluid Dynamics Approach for Inhalation Exposure Assessment: Case Study for Biocide Spray." Applied Sciences 11, no. 2 (January 11, 2021): 634. http://dx.doi.org/10.3390/app11020634.

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Consumer products contain chemical substances that threaten human health. The zero-dimensional modeling methods and experimental methods have been used to estimate the inhalation exposure concentration of consumer products. The model and measurement methods have a spatial property problem and time/cost-consuming problem, respectively. For solving the problems due to the conventional methodology, this study investigated the feasibility of applying computational fluid dynamics (CFD) for the evaluation of inhalation exposure by comparing the experiment results and the zero-dimensional results with CFD results. To calculate the aerosol concentration, the CFD was performed by combined the 3D Reynolds averaged Navier–Stokes equations and a discrete phased model using ANSYS FLUENT. As a result of comparing the three methodologies performed under the same simulation/experimental conditions, we found that the zero-dimensional spray model shows an approximately five times underestimated inhalation exposure concentration when compared with the CFD results and measurement results in near field. Additionally, the results of the measured concentration of aerosols at five locations and the CFD results at the same location were compared to show the possibility of evaluating inhalation exposure at various locations using CFD instead of the experimental method. The CFD results according to measurement positions can rationally predict the measurement results with low error. In conclusion, in the field of exposure science, a guideline for exposure evaluation using CFD, was found that complements the shortcomings of the conventional methodology, the zero-dimensional spray model and measurement method.

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27

Aqilah, Farah, Mazharul Islam, Franjo Juretic, Joel Guerrero, David Wood, and Farid Nasir Ani. "STUDY OF MESH QUALITY IMPROVEMENT FOR CFD ANALYSIS OF AN AIRFOIL." IIUM Engineering Journal 19, no. 2 (December 1, 2018): 203–12. http://dx.doi.org/10.31436/iiumej.v19i2.905.

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ABSTRACT: Airfoils generate lift in engineering applications such as for airplanes, wind turbines, automotive spoilers, etc. For accurate CFD analysis of airfoils, the quality of the mesh is of paramount importance, especially when dealing with turbulent flows commonly encountered in real life applications. Currently there are different tools that are available to improve the quality of the mesh required for CFD studies. This paper describes a study to assess the significant of the quality of the mesh on CFD analyses of NACA 23012 airfoil by using selected open source tools. The turbulence is modeled using the well-known k-Ï‰ Shear Stress Transport model. For validation, results have been compared with experimental datasets which were obtained from â€œTAG Stuttgart #1â€ tunnel. ABSTRAK: Sayap pesawat dapat menghasilkan daya angkat dalam aplikasi kejuruteraan seperti kapal terbang, turbin angin, spoiler automotif, dan sebagainya. Kualiti pada jaringan adalah amat penting bagi mendapatkan analisa CFD yang tepat pada sayap pesawat, terutamanya apabila berhadapan situasi aliran turbulen sebenar. Pada masa ini terdapat pelbagai perisian bagi meningkatkan mutu jaringan dalam kajian CFD. Kertas kerja ini membentangkan satu kajian bagi menilai kepentingan kualiti jaringan pada analisis CFD bagi sayap pesawat NACA 23012 dengan menggunakan sumber terpilih perisian terbuka. Model turbulen dibangunkan mengguna pakai model k-Ï‰ Shear Stress Transport (SST) yang terkenal. Bagi pengesahan, keputusan uji kaji telah dibandingkan dengan set data yang diperoleh dari terowong "TAG Stuttgart #1â€."

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Lin, Chen-Jiann, Tseng-Hsiang Tse, Liu-Cheng Che, and Liang-Ming Tsai. "Computer aided design and analysis on distributors in DAC columns." MATEC Web of Conferences 185 (2018): 00024. http://dx.doi.org/10.1051/matecconf/201818500024.

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Dynamic axial compression (DAC) columns are key elements in simulated moving bed, which is a chromatography process in drug industry and chemical engineering. In this study, rules for designing distributors are proposed based on mass conservation and validated by experiments, the computer aided design (CAD) and the computational fluid dynamics (CFD). Experimental works are conducted to choose feasible numerical parameters for simulations. In CFD, the transient laminar flow fields are governed by the momentum and species transport equations with Darcy's law to model the porous zone in the packed bed. Results show that CFD combined with CAD solid modelling is a good approach to explore detailed flow fields in DAC columns and carry out parameter analysis for innovative designs. For further testing and evaluation, a new model of compound distributor is designed, 3D printed and processed in factory for practical applications in preparative chromatography.

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Wang, Fei Yue, Yi Shun Zhang, Chang Liang Shi, Yuan Yang Liu, and Ling Zhang. "The Numerical Simulation Study of the Cone Hindered Settling Hydro-Sizer Based on CFD." Advanced Materials Research 807-809 (September 2013): 2340–44. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.2340.

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This paper use CFD software for geometric modeling and structural mesh for the Cone Hindered Settling Hydro-sizer and then apply the Fluent software for three-dimensional CFD simulation. Using RNG K-ε two-equation turbulence model and Swirl Dominated Flow model respectively, and the top speed of different feeding liquid two-phase flow of water under medium CFD numerical simulation results grader internal flow field characteristics.

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Xiong, Xuan, Xiao Ming Ye, and Kai Wang. "An Experimental Flow Study of the Pitching Oscillating Airfoil Using the PIV Technique." Applied Mechanics and Materials 733 (February 2015): 562–65. http://dx.doi.org/10.4028/www.scientific.net/amm.733.562.

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A wind tunnel experiment is carried out employing 2D-PIV technique to visualize the qualitative flow field and to obtain the quantitative velocity profile respectively in the wake of 1 Hz pitching oscillating airfoil of 6 degrees amplitude. In order to validate the experiment for future’s study, the experimental velocity data are compared to relative CFD ones. The CFD results are obtained from a code called Map Flow that is able to deal with the flow around pitching and plunging oscillating airfoil. From the vortices maps it is shown that the experimental results and CFD ones are well compared with respect to the size and the shape of the vortices patterns. Quantitatively, the differences between experiment and CFD with respect to the velocity profile are acceptable.

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Ghasemzadeh, Kamran, Milad Mohammad Alinejad, Milad Ghahremani, Rahman Zeynali, and Amin Pourgholi. "Theoretical Study of Palladium Membrane Reactor Performance During Propane Dehydrogenation Using CFD Method." Indonesian Journal of Chemistry 17, no. 1 (April 1, 2017): 113. http://dx.doi.org/10.22146/ijc.23625.

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This study presents a 2D-axisymmetric computational fluid dynamic (CFD) model to investigate the performance Pd membrane reactor (MR) during propane dehydrogenation process for hydrogen production. The proposed CFD model provided the local information of temperature and component concentration for the driving force analysis. After investigation of mesh independency of CFD model, the validation of CFD model results was carried out by other modeling data and a good agreement between CFD model results and theoretical data was achieved. Indeed, in the present model, a tubular reactor with length of 150 mm was considered, in which the Pt-Sn-K/Al2O3 as catalyst were filled in reaction zone. Hence, the effects of the important operating parameter (reaction temperature) on the performances of membrane reactor (MR) were studied in terms of propane conversion and hydrogen yield. The CFD results showed that the suggested MR system during propane dehydrogenation reaction presents higher performance with respect to once obtained in the conventional reactor (CR). In particular, by applying Pd membrane, was found that propane conversion can be increased from 41% to 49%. Moreover, the highest value of propane conversion (X = 91%) was reached in case of Pd-Ag MR. It was also established that the feed flow rate of the MR is to be the one of the most important factors defining efficiency of the propane dehydrogenation process.

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Lindstrøm, Erika Kristina, Jakob Schreiner, Geir Andre Ringstad, Victor Haughton, Per Kristian Eide, and Kent-Andre Mardal. "Comparison of phase-contrast MR and flow simulations for the study of CSF dynamics in the cervical spine." Neuroradiology Journal 31, no. 3 (February 21, 2018): 292–98. http://dx.doi.org/10.1177/1971400918759812.

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Background Investigators use phase-contrast magnetic resonance (PC-MR) and computational fluid dynamics (CFD) to assess cerebrospinal fluid dynamics. We compared qualitative and quantitative results from the two methods. Methods Four volunteers were imaged with a heavily T2-weighted volume gradient echo scan of the brain and cervical spine at 3T and with PC-MR. Velocities were calculated from PC-MR for each phase in the cardiac cycle. Mean pressure gradients in the PC-MR acquisition through the cardiac cycle were calculated with the Navier-Stokes equations. Volumetric MR images of the brain and upper spine were segmented and converted to meshes. Models of the subarachnoid space were created from volume images with the Vascular Modeling Toolkit. CFD simulations were performed with a previously verified flow solver. The flow patterns, velocities and pressures were compared in PC-MR and CFD flow images. Results PC-MR images consistently revealed more inhomogeneous flow patterns than CFD, especially in the anterolateral subarachnoid space where spinal nerve roots are located. On average, peak systolic and diastolic velocities in PC-MR exceeded those in CFD by 31% and 41%, respectively. On average, systolic and diastolic pressure gradients calculated from PC-MR exceeded those of CFD by 11% and 39%, respectively. Conclusions PC-MR shows local flow disturbances that are not evident in typical CFD. The velocities and pressure gradients calculated from PC-MR are systematically larger than those calculated from CFD.

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Gudi, Abhay, and Vijaykumar Hindasageri. "Experimental and Numerical Heat Transfer Study of Swirling Air Jet Impingement." International Journal of Heat and Technology 40, no. 4 (August 31, 2022): 1001–12. http://dx.doi.org/10.18280/ijht.400418.

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Experimental and numerical study has been performed to study effect of swirl on heat transfer. A twisted swirl tape with twist ratio (T. R)=2 is used to generate swirl and effect of parameters like z/d=2 to 8 and Re varying between 3000 to 9000 are studied experimentally. Experiments show heat transfer dependency on Reynolds number. This study is further extended numerically using commercial CFD code ANSYS Fluent for much higher Reynolds number flow up to 20000. It is seen that CFD centerline peak Nu profile matches pretty well with experiments conducted. A relation between peak Nu and Re is established numerically for the conditions mentioned above. Further, effect of multiple swirl jet impingement (two jets separated by distance 1.5D, 2D and 3D) on Peak Nu is explained through CFD studies. CFD results show that jet distance of 1.5D is more effective in achieving higher heat transfer compared to 2D and 3D distances.

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Kim, Sangyoon, Changgu Kim, Byungha Kim, Hyunjun Jang, Incheol Kim, and Young-Ho Lee. "A Study Comparing the Subsurface Vortex Characteristics in Pump Sumps." Energies 15, no. 14 (July 11, 2022): 5049. http://dx.doi.org/10.3390/en15145049.

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The vortex generated around the suction region of the pump sump causes problems such as damage to the pump, increased maintenance costs, and failure to supply coolant smoothly. Therefore, analyzing vortices is essential in pump sump design. However, the CFD analysis alone is insufficient in pump sumps vortex analysis since the reliability of the results is doubtful in scaled model tests. This study conducted the model test to validate a suitable CFD simulation method by identifying the Type 2 vortex among the three types of subsurface vortices. The dye test and PIV technology were used to visualize the Type 2 subsurface vortices, whereas the PIV vorticity results were then compared to the CFD results. The average vorticity of 60.2 (1/s) was identified as the reference level of Type 2 subsurface vortices formation by mapping the dye test results with the PIV vorticity results. Furthermore, the average vorticities of 84.63 (1/s) and 85.15 (1/s) were recorded in the presence of Type 2 subsurface vortices in PIV and CFD, respectively, and these values can be applied to the designing of pump sumps.

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Mohd Adib, Mohd Azrul Hisham, Lim Sheh Hong, Mohd Shafie Abdullah, Radhiana Hassan, and Shigeo Wada. "A perspective review: Technical study of combining phase contrast magnetic resonance imaging and computational fluid dynamics for blood flow on carotid bifurcation artery." Journal of Mechanical Engineering and Sciences 14, no. 4 (December 27, 2020): 7609–21. http://dx.doi.org/10.15282/jmes.14.4.2020.25.0599.

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Nowadays, the knowledge of precise blood flow patterns in human blood vessels, especially focusing on Carotid Bifurcations Artery (CBA) area by using computational and modern techniques are very important to develop our understanding regarding to human diseases for both essential research and clinical treatment. This paper tends to discuss the progress regarding to the integration between Phase Contrast Magnetic Resonance Imaging (PC-MRI) and Computational Fluid Dynamics (CFD), specifically to the human diseases. We technically define the model geometry reconstruction, review both PC-MRI and CFD methods to create mesh models, obtain boundary conditions, define the governing equations in CFD, define the material properties, and assumptions used in running the CFD simulations. Detailed information on PC-MRI and CFD is provided in tables, such as the MRI setup, software used, CFD model setup, measurement parameter, and summary of the result contribution from each reviewed article. Numerous fusions between PC-MRI and CFD are specified by summarizing the investigation carried out by significant group’s research, reviewing the important outcomes, and discussing the techniques, drawbacks and possibilities for further study. We hope that this perspective analysis will encourage a fusion of PC-MRI and CFD research contributing to continuous advancement of human health with close cooperation and collaboration among clinicians and engineers.

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AlizadehAttar, Alireza, Mojtaba Pourmahdian, and Baghar Anvaripour. "Experimental Study and CFD Simulation of Pool Fires." International Journal of Computer Applications 70, no. 11 (May 17, 2013): 9–15. http://dx.doi.org/10.5120/12004-5790.

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AKHIL, YUVARAJ MANDA, KUMAR RAJU VYSYARAJU SASHANK, VURAKARANAM NIKHIL, and CHANDU KONDAPALLI SAI. "COMPARATIVE STUDY ON STEPPED HEAT PIPE USING CFD." i-manager's Journal on Mechanical Engineering 10, no. 4 (2020): 8. http://dx.doi.org/10.26634/jme.10.4.17470.

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Rajavathsavai, D., A. Khapre, and B. Munshi. "Study of mixing behavior of cstr using CFD." Brazilian Journal of Chemical Engineering 31, no. 1 (March 2014): 119–29. http://dx.doi.org/10.1590/s0104-66322014000100012.

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Cao, Wei, Ying Fang, and De Xiang Li. "Study of CFD Modeling of Performance for Classification." Advanced Materials Research 516-517 (May 2012): 784–89. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.784.

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The numerical simulation in the classification has been used in ANSYS CFX 10.0. We described the different flow fields within the classification in accordance with the one-phase simulation experiment, which provided a new theoretical perspective for optimized design on classification. At the same time, the classification efficiency was predicted by simulation for two phase particle trajectory. This will lay a foundation for improving classification efficiency.

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Brito, Pedro M., Almerindo D. Ferreira, and Antonio C. M. Sousa. "A CFD study on the Irwin probe flows." Journal of Wind Engineering and Industrial Aerodynamics 219 (December 2021): 104808. http://dx.doi.org/10.1016/j.jweia.2021.104808.

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Lin, Qinjie, Peitang Wei, Huaiju Liu, Jiazan Zhu, Caichao Zhu, and Jizhan Wu. "A CFD-FEM numerical study on shot peening." International Journal of Mechanical Sciences 223 (June 2022): 107259. http://dx.doi.org/10.1016/j.ijmecsci.2022.107259.

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Joppolo, Cesare Maria, Davide Bertolina, Michela Palazzo, and Luca Marocco. "Preserving Leonardo’s Last Supper: A CFD case study." Journal of Cultural Heritage 51 (September 2021): 194–200. http://dx.doi.org/10.1016/j.culher.2021.08.011.

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Dimitris, Fidaros, Baxevanou Catherine, Tsagrasoulis Aris, Bartzanas Thomas, and Kittas Constantinos. "CFD Study of Thermal Comfort in Urban Area." Energy and Environmental Engineering 5, no. 1 (February 2017): 8–18. http://dx.doi.org/10.13189/eee.2017.050102.

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Saha, Soumyajit, and Debasis Chakraborty. "Hypersonic Intake Starting Characteristics–A CFD Validation Study." Defence Science Journal 62, no. 3 (May 3, 2012): 147–52. http://dx.doi.org/10.14429/dsj.62.1340.

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Fidaros, Dimitris, Catherine Baxevanou, Aris Tsangrassoulis, Thomas Bartzanas, and Constantinos Kittas. "Bioclimatic Reformation of Urban Area – A CFD Study." Procedia Environmental Sciences 38 (2017): 586–94. http://dx.doi.org/10.1016/j.proenv.2017.03.132.

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Misiulia, Dzmitry, Sergiy Antonyuk, Anders Gustav Andersson, and Tord Staffan Lundström. "High-efficiency industrial cyclone separator: A CFD study." Powder Technology 364 (March 2020): 943–53. http://dx.doi.org/10.1016/j.powtec.2019.10.064.

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Akhil Yuvaraj, Manda, and Geeri Satish. "Comparative study of different pipe geometries using CFD." Materials Today: Proceedings 33 (2020): 5384–91. http://dx.doi.org/10.1016/j.matpr.2020.03.120.

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Taghinia, Javad, Mizanur Rahman, Tim K. T. Tse, and Timo Siikonen. "CFD modeling of homogenizer valve: A comparative study." Chemical Engineering Research and Design 106 (February 2016): 327–36. http://dx.doi.org/10.1016/j.cherd.2015.12.014.

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Budiyanto, Muhammad Arif, Takeshi Shinoda, and Nasruddin. "Study on the CFD simulation of refrigerated container." IOP Conference Series: Materials Science and Engineering 257 (October 2017): 012042. http://dx.doi.org/10.1088/1757-899x/257/1/012042.

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Park, Byungsung, Sungwoo Woo, Sungwon Park, Jinhee Min, Woonyoung Lee, Sunam You, and Gabjin Jun. "Simulation study of DAF flotation basin using CFD." Journal of Korean Society of Water and Wastewater 27, no. 2 (April 15, 2013): 261–72. http://dx.doi.org/10.11001/jksww.2013.27.2.261.

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