Search results

CFD simulation on circulation within the liquid slug under Gas-Liquid Taylor flow in circular capillary Yunfeng Xie1,a, Xubin Zhang1,b, Yan Wang1c, Wangfeng Cai1,d School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China ayunfeng_xie@126.com, btjzxb@tju.edu.cn, cjoywy@126.com, dwfcai@tju.edu.cn Keywords: CFD simulation; circulation; Taylor flow; capillary.
Abstract: Computational Fluid Dynamics (CFD) was used to simulate the circulation within the liquid slug on gas-liquid Taylor flow in circular capillaries.
In this paper, the CFD simulation was adopted to study the circulation inside liquid slug during gas-liquid Taylor flow.
A finite volume based commercial CFD package, FLUENT, was adopted to carry out simulation.
CFD simulation performed under a coordinate system moving with the same velocity of gas bubble vb.

CFD simulation of capillary network radiation heating comfort Bin Sun1, a, Jiuling Zhang2,b 1 Northeast Dianli University, Jilin, Jilin,China 2 Northeast Dianli University, Jilin, Jilin,China aemail: sunbin@mail.nedu.edu.cn bemail:805737552@qq.com Keywords: capillary network radiation heating,comfort,CFD simulation.
According to the Airpak software,we perform a bedroom thermal environment CFD simulation when capillary network is in three different locations, from which,we get the temperature field, the velocity field and the PMV images.
Fig. 1 Physical model Mathematical models Turbulence models.In CFD technology, fluid flow to be governed by the law of the physical conservation, conservation law basically includes: the law of mass conservation, momentum conservation law, the law of conservation of energy and component conservation equation.
In CFD technology, fluid flow is governed by the physical conservation law, basic conservation law includes: mass conservation law, momentum conservation law, energy conservation law and component conservation equation.
[10] J.M.Diao,The CFD study of Capillary radiation air-conditioning system [D].

The sampling inlet was conducted using the CFD to perform a flow simulation.
It is suggested that CFD simulation can be useful for improving the optimum a shrouded aerosol sampling inlet.
Results and discussions A computational fluid dynamics (CFD) program, FLUENT 14.0 (ANSYS Inc.), was used to optimize aerosol sampling inlet design[8].
Conclusion A shrouded aerosol sampling inlet has been simulation for use on aircraft.
ANSYS ICEM CFD grid division technology and its examples.

Maximization of Solar Gains of an Air Collector by Simulations Ondrej Sikula1, a, Vit Merka1,b , Jiri Hirs1,c and Josef Plasek1,d 1Brno University of Technology, Faculty of Civil Engineering, Institute of Building Services, Veveri 331/95, Brno 602 00, Czech Republic asikula.o@fce.vutbr.cz, bvit@merka.eu, chirs.j@fce.vutbr.cz, dplasek.j@fce.vutbr.cz Keywords: solar air collector; solar gains; CFD simulation; numerical simulation; optimizing.
The firs one is Computational Fluid Dynamics (CFD) simulations of flow and heat transfer by convection, conduction and radiation in software ANSYS Fluent.
There were performed the full-year numerical simulations in these parts.
Solved geometry of solar air collector – concepts (A, B and C) Solution results and conclusions In Fig. 4 are shown the temperature and velocity fields, as the outputs of CFD simulation (see [3], [4]) of selected variants (based on Fig. 3 – the last geometrical concept) in software ANSYS Fluent.
Results of CFD simulation – concept B Conclusions A comparison of the studied variants follows that the highest performance and also the optimum pressure losses were obtained for variant C with perforations.

Results of CFD method match well with the engineering estimations, which provide a reliable and practical numerical simulation method for hydrodynamic characteristics simulation of UUVs in the future.
Simulation Method The authors have demonstrated that a computational fluid dynamics (CFD) technique can be a useful tool to estimate the hydrodynamic forces acting on the underwater glider.
And the grid quality will have an impact on feasibility, convergence and accuracy of numerical simulation directly.
Conclusions are as follows: (1) As demonstrated by results from CFD calculations compared with the engineering estimates, CFD methods can forecast the hydrodynamic characteristics of underwater gliding UUV more accurately.
CFD numerical simulation method enables detailed visualization of the flow field, including velocity and pressure distribution.

Numerical Simulation of Performance of Steam Ejector Influenced by the Distance between Nozzle Outlet and Mixing Chamber Inlet Dai Xiao-chuna, Liao Guo-jinb Liaoning University of Technology,Liaoning Jinzhou 121001,China adxiaoch@sohu.com bliaoguojin@163.com Keywords: Steam ejector; FLUENT; CFD; numerical simulation; distance; nozzle outlet Abstract.
CFD model Gambit 2.1 and FLUENT 6.2 were used as the grid generator and the CFD solver.
The numerical simulation results of 2-D model was very closed to the 3-D model[2].
During the simulation, the primary fluid saturated temperature was 130.
It is obvious that the CFD results agree well with actual value.

CFD Simulations of Natural Ventilation Effect: A Case Study of New Administrative Building of the Guanyin Township An-Shik Yang1,a, Jen-Hao Wu2 , Yu-Hsuan Juan3 and Ying-Ming Su4,b 1, 2, 3 Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei, Taiwan 4 Department of Architecture, National Taipei University of Technology, Taipei, Taiwan a asyang@ntut.edu.tw, b ymsu@ntut.edu.tw Keywords: Ventilation, performance simulator, wind environment, CFD Abstract.
In order to study the relationship between air pollution dispersal and ventilation for the Arena Stadium in Amsterdam, Blocken et al. [2] made the simulations of the wind across the urban for determining the natural ventilation rate.
To evaluate the ventilation effectiveness by ACH in Eq. 1, the simulation results indicated that the flowfield attained in Case C showed much better ventilation performance.
Carmeliet, ‘’CFD simulation of the atmospheric boundary layer: wall function problems,’’ Atmospheric Environment, vol. 41, no. 2, 2007, pp 238-252
Hanby, ‘‘CFD modelling of natural displacement ventilation inan enclosure connected to an atrium,’’ Building and Environment, vol. 42(3), 2007, pp. 1158–1172

Multi algorithm in CFD software and its application to Numerical simulation of 2D regular wave Li Hanwu,Yang Tao Luoyang Institute of Science & Technology E-mail: lihanwuly2012@126.com Abstract.
Fluent is a popular CFD software package now, it can model complicated fluxion question from incondensability to the highly condensability.
The simulation results well reflect the characteristics of the regular waves, agreed well with theoretical value.
Introduction Computational Fluid Dynamics CFD software is a strong international field of study, Fluent software is most popular commercial software used at home and abroad.
Simulation framework Figure2.

Numerical Simulation of the Odor Spreading in a Factory Cui cheng xun1, a 1 College of Engineering, Yanbian University, Yanji Jilin 133002，China acuichx@126.com Keywords: LCD, Coater Room, Bleed duct, CFDS Abstract.
One of the best tools to evaluate smoke management system performance more accurately for large-volume spaces involves computer simulations based on Computational Fluid Dynamics (CFD).
Simulation The actual combustion process is not as important as predicting the effects of smoke and heat in the space and how to best manage it.
Fig.1 shows the full scale 3D CFD domain with boundary conditions.
Simulations were done to study the effect of each duct independently and it was found that for cases III & IV (Table1) gave better performance in bleeding out hydrocarbon gas.

High Speed Photography and 3-D CFD Simulation of Pulsed Anti-riots Water Cannon Launch Process Yunhui Ao Department of Military traffic and Transportation, Engineering University of Armed Police Force of China, Xi’an, 710086, China ayh6221205@yahoo.com.cn Keywords: pulsed anti-riots water cannon, high speed photography, CFD simulation, second spray, first atomization.
Federico Montanariet [1] used the turbulence model of CFD software, gives a numerical study on piston-driven water cannon to analyze the movement of the piston.
The three-dimensional CFD simulation in the process of the Pulsed Anti-riots Water Cannon 2.1 Computational model and parameter settings Numerical simulation of turbulence includes Directed Numerical Simulation(DNS), Reynolds-average Navier-Stokes(RANS) and Large Eddy simulation(LES ) [8].
References [1] Federico Montanarietal: Exploratory CFD Analyses of the Fluid Dynamics of a Water Cannon.
[9] Xi Yu, Hongyuan Wei: Large Eddy Simulation for Large Eddy Simulation of Horizontal Pipe.