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Artykuły w czasopismach na temat „Flow simulation”

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Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 19 lutego 2022

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1

Bando, Kiyoshi, i Kenkichi Ohba. "Numerical Simulation of Flow around LDV-Sensor for Measuring Blood Flow Velocities(Cardiovascular flow Simulation)". Proceedings of the Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2004.1 (2004): 55–56. http://dx.doi.org/10.1299/jsmeapbio.2004.1.55.

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2

Liu, Youjun, Wei Huang, Haiwen Zhu, Song Gao i Yue Diao. "SIMULATION OF HEMODYNAMICS IN ABDOMINAL AORTA(Cardiovascular flow Simulation)". Proceedings of the Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2004.1 (2004): 49–50. http://dx.doi.org/10.1299/jsmeapbio.2004.1.49.

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3

Janajreh, Isam, Syed Shabbar Raza i Khadije El Kadi. "Greenhouse Microclimate Flow Simulation: Influence of Inlet Flow Conditions". International Journal of Thermal and Environmental Engineering 17, nr 1 (1.12.2018): 11–18. http://dx.doi.org/10.5383/ijtee.17.01.002.

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4

Wintterle, Thomas, i Eckart Laurien. "ICONE15-10409 NUMERICAL SIMULATION OF FLOW REVERSAL IN COUNTERCURRENT HORIZONTAL STRATIFEID FLOWS". Proceedings of the International Conference on Nuclear Engineering (ICONE) 2007.15 (2007): _ICONE1510. http://dx.doi.org/10.1299/jsmeicone.2007.15._icone1510_212.

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5

Minato, Akihiko, Nobuyuki Nakajima i Takahide Nagahara. "SIMULATION OF FREE SURFACE FLOW BY SP-VOF MODEL(Numerical Simulation)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 717–20. http://dx.doi.org/10.1299/jsmeicjwsf.2005.717.

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6

Li, Yongxing, Hongfei Jia, Ya-Nan Zhou i Lili Yang. "Simulation research on pedestrian counter flow subconscious behavior". International Journal of Modern Physics C 28, nr 02 (luty 2017): 1750025. http://dx.doi.org/10.1142/s0129183117500255.

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Analyzing the pedestrian subconscious behavior and walking environment in the passage, right-moving preference subconscious strength and overtaking subconscious strength are introduced into the pedestrian simulation model which is based on lattice gas model. Two pedestrian subconscious behavior simulation models, which are distinguished by whether considering pedestrian flow ratio of two directions or not, are established respectively. With the platform of MATLAB software, the simulations of pedestrian counter flow subconscious behavior are realized. The simulations indicate that compared with the pedestrian subconscious behavior simulation model without considering the pedestrian flow ratio of two directions, the model that considers the pedestrian flow ratio of two directions is better in simulating the pedestrian subconscious behavior.

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7

YI, H. H., L. J. FAN i Y. Y. CHEN. "LATTICE BOLTZMANN SIMULATION OF THE MOTION OF SPHERICAL PARTICLES IN STEADY POISEUILLE FLOW". International Journal of Modern Physics C 20, nr 06 (czerwiec 2009): 831–46. http://dx.doi.org/10.1142/s0129183109014035.

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A technique, based on the stress-integration method, for the evaluation of hydrodynamic forces on solid boundaries is proposed to simulate the solid-fluid flow systems in three dimensions in lattice Boltzmann simulations. The accuracy of the scheme is demonstrated by simulating the sphere migrating in a pressure-driven Newtonian fluid flow in a cylindrical tube. The numerical simulation results recover the Segré–Silberberg effect. Using this scheme, we investigate the behavior of a pair of spheres in a tube Poiseuille flow. Oscillatory states are observed for two spheres with different radii placed on opposite sides. The simulation results show that the present model is an effective and efficient direct numerical simulation method for simulating particle motions in fluid flows at finite Reynolds numbers in three dimensions.

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8

Fořt, J., J. Fürst, J. Halama i K. Kozel. "Numerical simulation of 3D transonic flow through cascades". Mathematica Bohemica 126, nr 2 (2001): 353–61. http://dx.doi.org/10.21136/mb.2001.134021.

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9

VELKOVA, Cvetelina. "NUMERICAL 3D TRANSONIC FLOW SIMULATION OVER A WING". Review of the Air Force Academy 15, nr 3 (14.12.2017): 5–14. http://dx.doi.org/10.19062/1842-9238.2017.15.3.1.

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10

Mäkipere, Krista, i Piroz Zamankhan. "Simulation of Fiber Suspensions—A Multiscale Approach". Journal of Fluids Engineering 129, nr 4 (18.08.2006): 446–56. http://dx.doi.org/10.1115/1.2567952.

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The present effort is the development of a multiscale modeling, simulation methodology for investigating complex phenomena arising from flowing fiber suspensions. The present approach is capable of coupling behaviors from the Kolmogorov turbulence scale through the full-scale system in which a fiber suspension is flowing. Here the key aspect is adaptive hierarchical modeling. Numerical results are presented for which focus is on fiber floc formation and destruction by hydrodynamic forces in turbulent flows. Specific consideration was given to dynamic simulations of viscoelastic fibers in which the fluid flow is predicted by a method that is a hybrid between direct numerical simulations and large eddy simulation techniques and fluid fibrous structure interactions will be taken into account. Dynamics of simple fiber networks in a shearing flow of water in a channel flow illustrate that the shear-induced bending of the fiber network is enhanced near the walls. Fiber-fiber interaction in straight ducts is also investigated and results show that deformations would be expected during the collision when the surfaces of flocs will be at contact. Smaller velocity magnitudes of the separated fibers compare to the velocity before collision implies the occurrence of an inelastic collision. In addition because of separation of vortices, interference flows around two flocs become very complicated. The results obtained may elucidate the physics behind the breakup of a fiber floc, opening the possibility for developing a meaningful numerical model of the fiber flow at the continuum level where an Eulerian multiphase flow model can be developed for industrial use.

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11

Hornung, Hans, Chihyung Wen i Patrick Germain. "Hypervelocity Flow Simulation". Applied Mechanics Reviews 47, nr 6S (1.06.1994): S14—S19. http://dx.doi.org/10.1115/1.3124393.

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Many of the flow problems associated with flight vehicles designed to reach or return from space can not be solved computationally. It is essential to address them by experiment, in particular, by ground simulation of the flow. The requirements and most successful simulation techniques are described, and their important limitations are discussed. Two selected examples are then presented from the free-piston reflected shock tunnel T5 at Caltech: Dissociating flow over spheres and transition from laminar to turbulent flow on a slender cone.

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12

Oh, Nam-Sun, Ik-Chang Choi, Dae-Geun Kim i Shin-Taek Jeong. "The Simulation of Upwelling Flow Using FLOW-3D". Journal of Korean Society of Coastal and Ocean Engineers 23, nr 6 (30.12.2011): 451–57. http://dx.doi.org/10.9765/kscoe.2011.23.6.451.

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13

Masuda, Koji, Hiroshi Suzuki, Yoshiyuki Komoda i Ruri Hidema. "Numerical Simulation of Particle Dispersion in Flow between Coaxial Cylinders under Unsteady Flow Conditions". Nihon Reoroji Gakkaishi 43, nr 3_4 (2015): 85–92. http://dx.doi.org/10.1678/rheology.43.85.

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14

Moore, Stephen, i Tim David. "3D Time-Dependent Models of Blood Flow in the Cerebro-vasculature(Cardiovascular flow Simulation)". Proceedings of the Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2004.1 (2004): 51–52. http://dx.doi.org/10.1299/jsmeapbio.2004.1.51.

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15

Kimmel-Klotzkin, Shari J., i Fadi P. Deek. "Large Eddy Simulation of Rotating Finite Source Convection". Journal of Applied Mechanics 73, nr 1 (16.05.2005): 79–87. http://dx.doi.org/10.1115/1.1991859.

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Numerical simulations of turbulent convection under the influence of rotation will help understand mixing in oceanic flows. Though direct numerical simulations (DNS) can accurately model rotating convective flows, this method is limited to small scale and low speed flows. A large eddy simulation (LES) with the Smagorinsky subgrid scale model is used to compute the time evolution of a rotating convection flow generated by a buoyancy source of finite size at a relatively high Rayleigh number. Large eddy simulations with eddy viscosity models have been used successfully for other rotating convective flows, so the Smagorinsky model is a reasonable starting point. These results demonstrate that a LES can be used to model larger scale rotating flows, and the resulting flow structure is in good agreement with DNS and experimental results. These results also demonstrate that the qualitative behavior of vorticies which form under the source depend on the geometry of the flow. For source diameters that are small compared to the size of the domain, the vortices propagate away from the source. On the other hand, if the ratio of source diameter to domain size is relatively large, the vortices are constrained beneath the source. Though the results are qualitatively similar to a direct numerical simulation (DNS) and other LES, in this simulation the flow remains laminar much longer than the DNS predicts. This particular flow is complicated by the turbulence transition between the convective plume and the quiescent ambient fluid, and an eddy viscosity model is inadequate to accurately model this type of flow. In addition, the Smagorinsky model is not consistent in a noninertial reference frame. Thus the Smagorinsky model is not the optimal choice for this type of flow. In particular, the estimation model has demonstrated better results for other types of rotating flows and is the recommended subgrid scale model for future work.

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16

Parsa, M. H., A. M. A. Pazooki i M. Nili Ahmadabadi. "Flow-forming and flow formability simulation". International Journal of Advanced Manufacturing Technology 42, nr 5-6 (24.07.2008): 463–73. http://dx.doi.org/10.1007/s00170-008-1624-0.

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17

Zhang, S., Y. Liu, J. Zhang i Y. Liu. "Simulation study of anisotropic flow resistance of farmland vegetation". Soil and Water Research 12, No. 4 (9.10.2017): 220–28. http://dx.doi.org/10.17221/50/2016-swr.

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Farmland vegetation is commonly cultivated with uniform planting spacing and heights. The effect of these features on resistance to hydraulic erosion is unclear. Hydraulic model experiments with the angle between the crop rows and the water flow direction set at 15°, 30°, 45° or 90° were conducted to analyze variation in the law of water flow resistance under partial or complete submergence of the crop. Cultivation can impact the flow resistance on slopes and this effect was greater when the crop was partially submerged. When planting spacing, slope, and water depth were constant, the change of the water flow Darcy-Weisbach resistance coefficient f with crop row-water flow angle was f<sub>15</sub>° > f<sub>30</sub>° > f<sub>45</sub>° > f<sub>90</sub>°. This suggests that flow resistance of farmland vegetation is anisotropic. The water flow resistance coefficient of crops that were partly submerged increased with water depth, but decreased with water depth when the crop was completely submerged. At the critical change from partial submergence to complete submergence, the water flow resistance coefficient was the highest when water depth was equal to crop height. These results may be useful for optimizing farmland planting and soil and water conservation.

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18

Jeong. "Rheological Characteristics and Debris Flow Simulation of Waste Materials". Journal of the Korean Society of Civil Engineers 34, nr 4 (2014): 1227. http://dx.doi.org/10.12652/ksce.2014.34.4.1227.

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19

Domagała, Mariusz, Hassan Momeni, Joanna Fabis-Domagała, Mariusz Krawczyk, Grzegorz Filo i Saeed Bikass. "Numerical Simulation of Fluid Flow inside the Flow Control Valve". Quality Production Improvement - QPI 1, nr 1 (1.07.2019): 394–99. http://dx.doi.org/10.2478/cqpi-2019-0053.

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Abstract Hydraulic valves are widely used in many branches and they are still developed and improved. Due to the problem with verification of flow phenomena which appears during valves operation numerical simulations methods are tools which allows to improved valves design. This paper presents numerical simulation of fluid flow inside flow control valve.

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20

Lee, Han Na, i Gi Hong Kim. "Flow-R Simulation of Debris Flow on Mt. Woomyeon". Journal of Korean Society for Geospatial Information Science 27, nr 6 (30.11.2019): 61–71. http://dx.doi.org/10.7319/kogsis.2019.27.6.061.

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21

Di Staso, G., H. J. H. Clercx, S. Succi i F. Toschi. "Lattice Boltzmann accelerated direct simulation Monte Carlo for dilute gas flow simulations". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, nr 2080 (13.11.2016): 20160226. http://dx.doi.org/10.1098/rsta.2016.0226.

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Hybrid particle–continuum computational frameworks permit the simulation of gas flows by locally adjusting the resolution to the degree of non-equilibrium displayed by the flow in different regions of space and time. In this work, we present a new scheme that couples the direct simulation Monte Carlo (DSMC) with the lattice Boltzmann (LB) method in the limit of isothermal flows. The former handles strong non-equilibrium effects, as they typically occur in the vicinity of solid boundaries, whereas the latter is in charge of the bulk flow, where non-equilibrium can be dealt with perturbatively, i.e. according to Navier–Stokes hydrodynamics. The proposed concurrent multiscale method is applied to the dilute gas Couette flow, showing major computational gains when compared with the full DSMC scenarios. In addition, it is shown that the coupling with LB in the bulk flow can speed up the DSMC treatment of the Knudsen layer with respect to the full DSMC case. In other words, LB acts as a DSMC accelerator. This article is part of the themed issue ‘Multiscale modelling at the physics–chemistry–biology interface’.

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22

Lo, Ming-Chung, Cheng-Chin Su, Jong-Shinn Wu i Kun-Chang Tseng. "Modelling Rarefied Hypersonic Reactive Flows Using the Direct Simulation Monte Carlo Method". Communications in Computational Physics 18, nr 4 (październik 2015): 1095–121. http://dx.doi.org/10.4208/cicp.080115.010515s.

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AbstractThis paper presents the implementation, validation and application of TCE (total collision energy) model for simulating hypersonic reactive flows in a parallel direct simulation Monte Carlo code, named PDSC++, using an unstructured grid. A series of benchmarking test cases, which include reproduction of theoretical rate constants in a single cell, 2D hypersonic flow past a cylinder and 2D-axisymmetric hypersonic flow past a sphere, were performed to validate the implementation. Finally, detailed aerothermodynamics of the flown reentry Apollo 6 Command Module at 105 km is simulated to demonstrate the powerful capability of the PDSC++in treating realistic hypersonic reactive flow at high altitude.

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23

Hannon, L., G. C. Lie i E. Clementi. "Molecular dynamics simulation simulation of channel flow". Physics Letters A 119, nr 4 (grudzień 1986): 174–77. http://dx.doi.org/10.1016/0375-9601(86)90440-8.

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24

Matúšová, Miriam. "Material Flow Design Supported by Simulation Methods". Applied Mechanics and Materials 474 (styczeń 2014): 91–96. http://dx.doi.org/10.4028/www.scientific.net/amm.474.91.

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Design solution of material flows planning in manufacturing systems belongs to key aspects that the project engineers must resolute. The conception and technical material flow realisation considerable define the dependability, promptness, consistence and next needed flows of work in the material flow. These necessary material flow functions influence the production quality, the amounts of production costs and the producer profitability. Follow up is starting to use the simulation methods at material flow designs and innovations. These methods are used in verification of new designs of material flows or in validation of just realised material flows. There is possibility of verification and validation usage by software Witness. Witness software simulation offers an optimal solution of problems by means. It enables to simulate working environment as well as material flows. The result is the higher efficiency of whole process and elimination of problems.

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25

Ge, Liang, Hwa-Liang Leo, Fotis Sotiropoulos i Ajit P. Yoganathan. "Flow in a Mechanical Bileaflet Heart Valve at Laminar and Near-Peak Systole Flow Rates: CFD Simulations and Experiments". Journal of Biomechanical Engineering 127, nr 5 (31.03.2005): 782–97. http://dx.doi.org/10.1115/1.1993665.

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Time-accurate, fully 3D numerical simulations and particle image velocity laboratory experiments are carried out for flow through a fully open bileaflet mechanical heart valve under steady (nonpulsatile) inflow conditions. Flows at two different Reynolds numbers, one in the laminar regime and the other turbulent (near-peak systole flow rate), are investigated. A direct numerical simulation is carried out for the laminar flow case while the turbulent flow is investigated with two different unsteady statistical turbulence modeling approaches, unsteady Reynolds-averaged Navier-Stokes (URANS) and detached-eddy simulation (DES) approach. For both the laminar and turbulent cases the computed mean velocity profiles are in good overall agreement with the measurements. For the turbulent simulations, however, the comparisons with the measurements demonstrate clearly the superiority of the DES approach and underscore its potential as a powerful modeling tool of cardiovascular flows at physiological conditions. The study reveals numerous previously unknown features of the flow.

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26

Guchenko, E., i E. Vasilev. "Flow simulation textual information". Актуальные направления научных исследований XXI века: теория и практика 3, nr 5 (6.11.2015): 196–99. http://dx.doi.org/10.12737/14487.

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Charbel, Fady, Jianjun Shi, Francis Quek, Meide Zhao i Mukesh Misra. "Neurovascular flow simulation review". Neurological Research 20, nr 2 (marzec 1998): 107–15. http://dx.doi.org/10.1080/01616412.1998.11740491.

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28

Hoseinzadeh, Morteza. "Flow-Based Simulation Methodology". IEEE Computer Architecture Letters 17, nr 1 (1.01.2018): 51–54. http://dx.doi.org/10.1109/lca.2017.2756051.

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29

Kronjäger, Winfried, i Peter Konhäuser. "Applied Traffic Flow Simulation". IFAC Proceedings Volumes 30, nr 8 (czerwiec 1997): 777–80. http://dx.doi.org/10.1016/s1474-6670(17)43916-4.

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30

Asami, Naoya, Yoichi Yamazaki i Yoshimi Kamiyama. "Blood Flow Simulation during Flow-Mediated Dilation". IEEJ Transactions on Electronics, Information and Systems 138, nr 3 (2018): 221–27. http://dx.doi.org/10.1541/ieejeiss.138.221.

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Asami, Naoya, Yoichi Yamazaki i Yoshimi Kamiyama. "Blood flow simulation during flow-mediated dilation". Electronics and Communications in Japan 101, nr 8 (25.06.2018): 19–26. http://dx.doi.org/10.1002/ecj.12083.

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32

Chau, K. T., i K. H. Lo. "Hazard assessment of debris flows for Leung King Estateof Hong Kong by incorporating GIS with numericalsimulations". Natural Hazards and Earth System Sciences 4, nr 1 (9.03.2004): 103–16. http://dx.doi.org/10.5194/nhess-4-103-2004.

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Abstract. As over seventy percent of the land of Hong Kong is mountainous, rainfall-induced debris flows are not uncommon in Hong Kong. The objective of this study is to incorporate numerical simulations of debris flows with GIS to identify potential debris flow hazard areas. To illustrate this approach, the proposed methodology is applied to Leung King Estate in Tuen Mun. A Digital Elevation Model (DEM) of the terrain and the potential debris-flow sources were generated by using GIS to provide the required terrain and flow source data for the numerical simulations. A theoretical model by Takahashi et al. (1992) improved by incorporating a new erosion initiation criterion was used for simulating the runout distances of debris flows. The well-documented 1990 Tsing Shan debris flow, which occurred not too far from Leung King Estate, was used to calibrate most of the flow parameters needed for computer simulations. Based on the simulation results, a potential hazard zone was identified and presented by using GIS. Our proposed hazard map was thus determined by flow dynamics and a deposition mechanism through computer simulations without using any so- called expert opinions, which are bounded to be subjective and biased.

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33

Horng, Horng-Chyi, i Kuo-Kai Chien. "A Simulation Study on the Flow Effectiveness of DBR Scheduling". International Journal of Materials, Mechanics and Manufacturing 6, nr 2 (kwiecień 2018): 109–13. http://dx.doi.org/10.18178/ijmmm.2018.6.2.357.

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LEE, Mi Young, Tetuya KAWAMURA i Kunio KUWAHARA. "Numerical Simulation of Shock Wave in a Vortex Dominant Flow". Proceedings of the JSME annual meeting 2004.2 (2004): 19–20. http://dx.doi.org/10.1299/jsmemecjo.2004.2.0_19.

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Tatsuya, Yasuda, Kawahara Genta i Goto Susumu. "1184 Large-eddy simulation of turbulent hyperbolic-stagnation-point flow". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013): _1184–1_—_1184–5_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1184-1_.

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De Stefano, G., i O. V. Vasilyev. "A fully adaptive wavelet-based approach to homogeneous turbulence simulation". Journal of Fluid Mechanics 695 (8.02.2012): 149–72. http://dx.doi.org/10.1017/jfm.2012.6.

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AbstractThe ability of wavelet multi-resolution analysis to detect and track the energy-containing motions that govern the dynamics of a fluid flow offers a unique hierarchical framework for modelling and simulating turbulence. In this paper, the role of the wavelet thresholding level in wavelet-based modelling and simulation of turbulent flows is systematically examined. The thresholding level controls the relative importance of resolved energetic structures and residual unresolved background flow and, thus, the achieved turbulence resolution. A fully adaptive eddy capturing approach is developed that allows variable-fidelity numerical simulations of turbulence to be performed. The new method is based on wavelet filtering with time-varying thresholding. The thresholding level automatically adapts to the desired turbulence resolution during the simulation. The filtered governing equations supplemented by a localized dynamic energy-based closure model are solved numerically using the adaptive wavelet collocation method. The approach is successfully tested in the numerical simulation of both linearly forced and freely decaying homogeneous turbulence.

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Adamczyk, J. J., M. L. Celestina i Jen Ping Chen. "Wake-Induced Unsteady Flows: Their Impact on Rotor Performance and Wake Rectification". Journal of Turbomachinery 118, nr 1 (1.01.1996): 88–95. http://dx.doi.org/10.1115/1.2836611.

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The impact of wake-induced unsteady flows on blade row performance and the wake rectification process is examined by means of numerical simulation. The passage of a stator wake through a downstream rotor is first simulated using a three-dimensional unsteady viscous flow code. The results from this simulation are used to define two steady-state inlet conditions for a three-dimensional viscous flow simulation of a rotor operating in isolation. The results obtained from these numerical simulations are then compared to those obtained from the unsteady simulation both to quantify the impact of the wake-induced unsteady flow field on rotor performance and to identify the flow processes which impact wake rectification. Finally, the results from this comparison study are related to an existing model, which attempts to account for the impact of wake-induced unsteady flows on the performance of multistage turbomachinery.

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Feng, Yixiang, Shigeo Wada, Ken-ichi Tsubota i Takami Yamaguchi. "A Computer Simulation on the Growth of Intracranial Aneurysms Arising From a Straight Artery(Cardiovascular flow Simulation)". Proceedings of the Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2004.1 (2004): 47–48. http://dx.doi.org/10.1299/jsmeapbio.2004.1.47.

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Oliveira, T. F., R. B. Miserda i F. R. Cunha. "Dynamical Simulation and Statistical Analysis of Velocity Fluctuations of a Turbulent Flow behind a Cube". Mathematical Problems in Engineering 2007 (2007): 1–28. http://dx.doi.org/10.1155/2007/24627.

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A statistical approach for the treatment of turbulence data generated by computer simulations is presented. A model for compressible flows at large Reynolds numbers and low Mach numbers is used for simulating a backward-facing step airflow. A scaling analysis has justified the commonly used assumption that the internal energy transport due to turbulent velocity fluctuations and the work done by the pressure field are the only relevant mechanisms needed to model subgrid-scale flows. From the numerical simulations, the temporal series of velocities are collected for ten different positions in the flow domain, and are statistically treated. The statistical approach is based on probability averages of the flow quantities evaluated over several realizations of the simulated flow. We look at how long of a time average is necessary to obtain well-converged statistical results. For this end, we evaluate the mean-square difference between the time average and an ensemble average as the measure of convergence. This is an interesting question since the validity of the ergodic hypothesis is implicitly assumed in every turbulent flow simulation and its analysis. The ergodicity deviations from the numerical simulations are compared with theoretical predictions given by scaling arguments. A very good agreement is observed. Results for velocity fluctuations, normalized autocorrelation functions, power spectra, probability density distributions, as well as skewness and flatness coefficients are also presented.

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40

ZHOU, Mingzheng, Ruichang ZHAO, Liuli SUN i Huanran FAN. "ICONE23-1352 SIMULATION ANALYSIS OF INLET FLOW FIELD FOR AIR FLOW PATH OF PASSIVE CONTAINMENT COOLING SYSTEM". Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–1—_ICONE23–1. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-1_163.

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Degawa, Tomohiro, i Tomomi Uchiyama. "NUMERICAL SIMULATION OF THE BUBBLY FLOW AROUND A RECTANGULAR CYLINDER BY VORTEX IN CELL METHOD(Multiphase Flow)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 235–40. http://dx.doi.org/10.1299/jsmeicjwsf.2005.235.

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TANAKA, Masa-aki, Satoshi MURAKAMI, Hideki HIBARA i Kozo SUDO. "NUMERICAL SIMULATION OF THE FLOW CHARACTERISTICS IN T-JUNCTION WITH TURBULENCE PROMOTER(T-junction and Cross Flow)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 623–27. http://dx.doi.org/10.1299/jsmeicjwsf.2005.623.

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Hong, Renkai, Zhenhua Xia, Yipeng Shi, Zuoli Xiao i Shiyi Chen. "Constrained Large-Eddy Simulation of Compressible Flow Past a Circular Cylinder". Communications in Computational Physics 15, nr 2 (luty 2014): 388–421. http://dx.doi.org/10.4208/cicp.050513.270513a.

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AbstractCompressible flow past a circular cylinder at an inflow Reynolds number of 2x105is numerically investigated by using a constrained large-eddy simulation (CLES) technique. Numerical simulation with adiabatic wall boundary condition and at a free-stream Mach number of 0.75 is conducted to validate and verify the performance of the present CLES method in predicting separated flows. Some typical and characteristic physical quantities, such as the drag coefficient, the root-mean-square lift fluctuations, the Strouhal number, the pressure and skin friction distributions around the cylinder,etc.are calculated and compared with previously reported experimental data, finer-grid large-eddy simulation (LES) data and those obtained in the present LES and detached-eddy simulation (DES) on coarse grids. It turns out that CLES is superior to DES in predicting such separated flow and that CLES can mimic the intricate shock wave dynamics quite well. Then, the effects of Mach number on the flow patterns and parameters such as the pressure, skin friction and drag coefficients, and the cylinder surface temperature are studied, with Mach number varying from 0.1 to 0.95. Non-monotonic behaviors of the pressure and skin friction distributions are observed with increasing Mach number and the minimum mean separation angle occurs at a subcritical Mach number of between 0.3 and 0.5. Additionally, the wall temperature effects on the thermodynamic and aerodynamic quantities are explored in a series of simulations using isothermal wall boundary conditions at three different wall temperatures. It is found that the flow separates earlier from the cylinder surface with a longer recirculation length in the wake and a higher pressure coefficient at the rear stagnation point for higher wall temperature. Moreover, the influences of different thermal wall boundary conditions on the flow field are gradually magnified from the front stagnation point to the rear stagnation point. Moreover, the influences of different thermal wall boundary conditions on the flow field are graduallymagnified from the front stagnation point to the rear stagnation point. It is inferred that the CLES approach in its current version is a useful and effective tool for simulating wall-bounded compressible turbulent flows with massive separations.

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Zhao, Hu, i Julia Kowalski. "Topographic uncertainty quantification for flow-like landslide models via stochastic simulations". Natural Hazards and Earth System Sciences 20, nr 5 (26.05.2020): 1441–61. http://dx.doi.org/10.5194/nhess-20-1441-2020.

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Abstract. Digital elevation models (DEMs) representing topography are an essential input for computational models capable of simulating the run-out of flow-like landslides. Yet, DEMs are often subject to error, a fact that is mostly overlooked in landslide modeling. We address this research gap and investigate the impact of topographic uncertainty on landslide run-out models. In particular, we will describe two different approaches to account for DEM uncertainty, namely unconditional and conditional stochastic simulation methods. We investigate and discuss their feasibility, as well as whether DEM uncertainty represented by stochastic simulations critically affects landslide run-out simulations. Based upon a historic flow-like landslide event in Hong Kong, we present a series of computational scenarios to compare both methods using our modular Python-based workflow. Our results show that DEM uncertainty can significantly affect simulation-based landslide run-out analyses, depending on how well the underlying flow path is captured by the DEM, as well as on further topographic characteristics and the DEM error's variability. We further find that, in the absence of systematic bias in the DEM, a performant root-mean-square-error-based unconditional stochastic simulation yields similar results to a computationally intensive conditional stochastic simulation that takes actual DEM error values at reference locations into account. In all other cases the unconditional stochastic simulation overestimates the variability in the DEM error, which leads to an increase in the potential hazard area as well as extreme values of dynamic flow properties.

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ALAM, M., i N. D. SANDHAM. "Direct numerical simulation of ‘short’ laminar separation bubbles with turbulent reattachment". Journal of Fluid Mechanics 403 (25.01.2000): 223–50. http://dx.doi.org/10.1017/s0022112099007119.

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Direct numerical simulation of the incompressible Navier-Stokes equations is used to study flows where laminar boundary-layer separation is followed by turbulent reattachment forming a closed region known as a laminar separation bubble. In the simulations a laminar boundary layer is forced to separate by the action of a suction profile applied as the upper boundary condition. The separated shear layer undergoes transition via oblique modes and Λ-vortex-induced breakdown and reattaches as turbulent flow, slowly recovering to an equilibrium turbulent boundary layer. Compared with classical experiments the computed bubbles may be classified as ‘short’, as the external potential flow is only affected in the immediate vicinity of the bubble. Near reattachment budgets of turbulence kinetic energy are dominated by turbulence events away from the wall. Characteristics of near-wall turbulence only develop several bubble lengths downstream of reattachment. Comparisons are made with two-dimensional simulations which fail to capture many of the detailed features of the full three-dimensional simulations. Stability characteristics of mean flow profiles are computed in the separated flow region for a family of velocity profiles generated using simulation data. Absolute instability is shown to require reverse flows of the order of 15–20%. The three-dimensional bubbles with turbulent reattachment have maximum reverse flows of less than 8% and it is concluded that for these bubbles the basic instability is convective in nature.

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Krishtop, Ihor, Victor German, Alexander Gusak, Svitlana Lugova i Alexey Kochevsky. "Numerical Approach for Simulation of Fluid Flow in Torque Flow Pumps". Applied Mechanics and Materials 630 (wrzesień 2014): 43–51. http://dx.doi.org/10.4028/www.scientific.net/amm.630.43.

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Torque flow pumps are widely used for pumping of fluids with high content of solid and fibrous inclusions and gas bubbles, in particular, for pumping of sewage and wastes. Fluid flow in these pumps is featured with strong vortex patterns, making it difficult to predict reliably their performance curves numerically. The paper is devoted to selection of a numerical approach for simulation of fluid flow in a torque flow pump of “Turo” type and its influence on simulation results. In particular, influence of geometrical configuration of the rotor-stator interface as well as numerical grid fineness is demonstrated. For one geometric configuration, the fluid flow is simulated with different turbulent models, with a steady state as well as transient approach. The simulations were performed using the software product ANSYS CFX. The simulation results are compared with the experimental measurements in the torque flow pump of “Turo” type. The experimental research included probing of fluid flow in three cross-sections of the stator domain, visualizing of streamlines along the rotating and stationary walls, as well as obtaining of performance curves. A good agreement between the numerical and experimental results is obtained as the rotor-stator interface is located at some distance off the rotating parts. Influence of choice of the turbulence model on the simulation results is demonstrated. Conclusions and recommendations are made concerning the choice of initial and boundary conditions, geometrical configuration of the rotor-stator interface, and parameters of turbulence models that affect both the flow pattern in the pump and its performance curves as well as the numerical solution time and required computational resources.

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Kareeri, A. A., H. D. Zughbi i H. H. Al-Ali. "Simulation of Flow Distribution in Radial Flow Reactors". Industrial & Engineering Chemistry Research 45, nr 8 (kwiecień 2006): 2862–74. http://dx.doi.org/10.1021/ie050027x.

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Bayatian, Majid, Mohammad Reza Ashouri i Rouhallah Mahmoudkhani. "Flow Behavior Simulation with Computational Fluid Dynamics in Spray Tower Scrubber". International Journal of Environmental Science and Development 7, nr 3 (2016): 181–84. http://dx.doi.org/10.7763/ijesd.2016.v7.764.

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ZHOU, Chunliang, Haihui QIU, Hongtao ZHENG i Xiande PAN. "B206 NUMERICAL SIMULATION OF LI/SF_6 COMBUSTION FLOW FIELD(Combustion-5)". Proceedings of the International Conference on Power Engineering (ICOPE) 2009.2 (2009): _2–111_—_2–116_. http://dx.doi.org/10.1299/jsmeicope.2009.2._2-111_.

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Zhang, Fu Lun, Song Sheng Deng i Wei Xing Hua. "Numerical Simulation for Flow Field in Hydrocyclone". Advanced Materials Research 335-336 (wrzesień 2011): 683–87. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.683.

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According to the RNG model and the Euler method, the flow field inside hydrocyclone is simulated by the CFD. The results show that: the internal flow field of the hydrocyclone is quite complicated, which means that the fluid flow parameters in the same location vary widely within different directions, such as track, velocity, separation and so on. The flows of cylindrical section and conical section are very different, at the same time, the main separation process is completed in the conical section. In the hydrocyclone with single entry, the center of the flow field is not in the position of geometric center; which will influence the stability of the flow field and the separation.

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