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The paper studies on the variation of the gas flow pressure and velocity through the converter by the computational fluid dynamics (CFD) methods.
There are many CFD commercial software such as PHOENICS, CFX, STAR-CD, FIDIP and FLUENT, etc..
The pressure simulation results and analysis.
Conclusion This paper studies the gas flow pressure and velocity characteristics of the porous material by CFD method.  
Song CFD simulation of the effect of upstream flow distribution on the light-off performance of a catalytic converter Energy Convers.

China, 250061 aanyantao@163.com, b meywang@sdu.edu.cn, cwjg_mrn@sina.cn Keywords: control valve; blocking fault; Flow Field; CFD Abstract.
Establish interior flow field model of the control valves under the blocking fault, using the CFD simulation and analysis the internal flow field of the control valve under the blocking and the trouble-free.
These conclusions show that the simulation results can be more accurate and reliable.
Opening 40 Flow Field Simulations When the relative openings is 40%, given a set of differential pressure 100kPa, 200kPa, 300kPa, 400kPa, 500kPa, 600kPa, 700kPa, 800kPa, 900kPa, 1000kPa, numerical simulation and obtain the flow value of trouble-free and the blocking, which is shown in Fig.15.
Fig. 15 Differential pressure –flow Fig.16 Differential pressure-the relative flow Conclusions Establish interior flow field model of the control valves under the blocking fault, using the CFD simulation and analysis the internal flow field of the control valve under the blocking and the trouble-free.

Cfd simulation Three Simulation Cases of Planning and Design. 1) Case of the Existing Planning and Design This existing planning and design case (Hereinafter referred to as case-1) consists of three rows multiply four lines prefab houses (12 in total).
The CFD simulations use standard k–ε 3-dimensional turbulent flow model.
These sections’ facet average wind velocities (v) which reflect the natural ventilation below 2.8m height above ground were extracted from the CFD simulation results of 3 cases respectively.
That indicates the improved building is a key to the significant improvement in ventilation environment. 4) In our CFD simulation researches we only take wind pressure into account.
[10] Kazuya Takahashi, Harunori Yoshida, Yuzo Tanaka, Noriko Aotake, Fulin Wang, “Measurement of thermal environment in Kyoto city and its prediction by CFD simulation,” Energy and Buildings, vol. 36, 2004, pp.771–779

Study of Architectural Design Method Based On Concept of Wind Environment DUAN Xiang1,a, XU Wei-qi1,b 1School of Civil Engineering and Architecture，Wuhan Polytechnic University，China,430023 ajintang28@163.com, bxuweiqi00608@163.com Keywords: Wind Environment，Architectural Design Method，CFD Simulation Abstract.
Data Simulation Method Being Adopted for the Prediction of Outdoor Wind Environmental.
Computa-tional Fluid Dynamics is the software being used more generally at present.It is scilicet simulation analyzed with CFD software for wind environment in building clusters.Through the simulation of the airflow by CFD,the region of strong wind and improper ventilation can be viewed intuitionally.Thus,combining analysis results,designers may attain the goals that satisfies the request of natural ventilation finally by optimizing the total plane layout and physique space,meanwhile,it can be as the base of evaluation to wind environment(see Fig.3).
Fig. 3: Application of CFD on the Wind Environment Simulating Graph of a Residential Quarter.
References [1] R.Yoshie,A.Mochida:Journal of Wind Engineering and Industrial Aerodynamics,Vol.95(2007), p.1551 [2] Yoshihide Tominaga:Journal of Wind Engineering and Industrial Aerodynamics,Vol.96(2008), p.1749 [3] C.W.Tsang,K.C.S.Kwok,P.A.Hitchcock:Bilding and Environment,Vol.49(2012),p.167 [4] Yoshie,R,“CFD analysis of flow field around a high-rise building”,in Summaries of Technical Papers of Annual Meeting,Environ,Engg, II, AIJ,(1999),in Japanese [5] Kataoka,H,“Large Eddy Simulation of building”,in Summaries of Technical Papers of Annual Meeting,Environ,Engg,II,AIJ,(2003),in Japanese [6] Information on http://www.abbs.com.cn/

Using CFD technology, the ameliorative hydraulic retarder is studied contrastively, and the results are in good agreement with the experiment.
At present, the algorithm of SIMPLE series are still applied widely in CFD numerical simulation, which consist of SIMPLE, SIMPLEC SIMPLER and PISO[3].
From analysis results above wan can see that the most relative error of simulation results and experiments is 10.2%, the CFD simulation results agree well with the experimental results.
The CFD simulation results agree well with the experimental results, which also can be used for the design and optimization of the hydraulic retarder.
FLUNT-Hydrodynamics Engineering Simulation Calculation Instance and Application, (Beijing Institute of Technology Press, Beijing, 2004), in Chinese

With the development of computational fluid dynamics technology, the CFD technology can make a comprehensive prediction on the product properties according to the actual situation which has been widely used in related industries in foreign countries.
In recent years, the CFD software is gradually popularized in China, which our country also began to pay attention to the application of CFD technology to the design and development of pump products.
Based on the current research status of this, the paper uses CFD software FLUENT to simulate the flow field of turbulent flow in fluorine plastic centrifugal pump, which is reference worth to the advance in the design of level centrifugal pump.
Through the simulation values of numerical simulation of fluorine plastic centrifugal pump were compared with the experimental values of pump performance test system, the design of the pump was reasonable, and is also good to play the role of centrifugal pump performance prediction.
In Chinese [5] Richard B，MedvitzR B，RobertF，etal Performance analysis of cavitation flow in centrifugal pumps using multiphase CFD[J]．Journal of Fluids Engineering, 2002, 124(2)：377~383．

In recent years, computational fluid dynamics (CFD) simulation have become popular in membrane separation simulation.
A CFD study of unsteady flow in narrow spacer-filled channels for spiral-wound membrane modules.
CFD simulation of fluid flow through spacer-filled membrane Module: selecting suitable cell types for periodic boundary conditions.
And a three-dimensional CFD simulation was performed to study the velocity distribution in flow channel of the membrane module, and the effect of face permeability, porous medium thickness, and pressure-jump coefficient of porous-jump model on membrane flux.
Membrane parameters setting Fluent software was used to CFD for the simulation of the velocity distribution in flow channel of the membrane module, and the effect of face permeability, porous medium thickness, and pressure-jump coefficient of porous-jump model on membrane flux were investigated.

In this paper, computational fluid dynamics (CFD) numerical simulation theory and methodology were applied.
The flow field characteristics of the seal cavity vapor-liquid two-phases flow were numerical calculated by using CFD mix-multiphase flow model.
CFD Basic Theory Fluid flow is dominated by the law of physical conservation, the basic conservation equation consist of the mass conservation law, the momentum conservation law and the energy conservation law.
CFD Numerical Modeling CFD Pre-processing.
The thermal oil pump bellows mechanical seal is used as the researching object, and the schematic diagram of the bellows mechanical seal shown in Fig.1.The three-dimensional geometric model of the seal cavity flow field was built by the CFD pre-processing software GAMBIT.

The topology of these structures is challenging to investigate using Computational Fluid Dynamics (CFD) [4-5].
Therefore, in this paper, the flow characteristics of the directional control valve are obtained by CFD simulation.
Numerical Analysis and CFD Modeling For solving the transient flow through the valve, the computational fluid dynamics (CFD) analysis is employed.
In order to obtain the steady/transient flow characteristic of the valve, the simulations were performed using the commercial software SolidWorks 2013 with Flow Simulation.
Rajda, CFD analysis of pressure loss during flow by hydraulic directional control valve constructed from logic valve, Energ.

A finite element calculating model of CFD was established coupled radiation and natural convection to accurately predict lamp surface temperatures.
Simulation results were consistent with the experimental data, and the validity of the computational model was confirmed.
Computational Fluid Dynamics (CFD) is a computational technology with which we can analyze the velocity of flow and temperature inside the lamp [2].
Thermocouples were used in test, and we compared the simulation data and experimental results.
In the new simulation, and .