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Computational Fluid Dynamics (CFD) is widely applied in solving fluid flow and heat transfer.
With the continuous improvements of the CFD computational technologies, the applications of CFD have also been broadened.
Compared with the practical experiment, CFD simulation can change specific simulation conditions with less cost and time.
[6] Xie J，Qu X H, Shi J Y, et al．Effect of design parameters on flow and temperature fields of a cold store by CFD simulation[J]．Journal of Food Engineering，2006, 77 (2)：355~363
CFD simulation of effects of operating parameters and product on heat transfer and moisture loss in the stack of bagged potatoes[J].

CFD Simulation Governing Equations and Drag Coefficient.
CFD Simulation and Results.
The CFD simulation is carried with three different turbulence models and two different boundary conditions.
For 0.8 times of the car length, the simulation results are shown in table 1, where we can find the simulation results varies when the far field is set as No slip wall.
More CFD research job will be done for further study of this problem.

Methodology In order to run CFD simulation, the design of car model has been created using AutoCAD software.
Both configurations need to be provided before running it into wind tunnel test and CFD simulation.
The spoiler 3 model had highly percentage of different between wind tunnel test and CFD simulation results.
As the conclusions from the CFD simulations analysis, the values obtained are similar to the value of the wind tunnel test results.
This may indicate that the use of CFD simulation is much easier when compared with the wind tunnel test, because the simulation can reduce the cost of experiments, saving time and energy.

Numercial Simulation of a Special Valve in Pneumatic Conveying Pipelines Xiaobin Huang1, a, Siyuan Zhang1,b , Yufeng Luo1 and Wenbiao Zhang1 1School of Control and Computer Engineering, North China Electric Power University, China abin_huangcn@126.com, bmercuryzsy@126.com Keywords: gas-solid flow, CFD simulation, primary air duct, regulating valve Abstract.
This simulation uses SOLIDWORKS to build the valve model ICEM-CFD to generate the mesh, and FLUENT to numerically simulate the fluid field in pipeline under different opening degrees of the valve.
Fig. 1 Valve Plug Numerical Simulation In this paper, commercial CFD software----FLUENT is used to conduct the numerical simulation.
The stable Lagrangian discrete phase model (DPM) is used in the simulation.
Chen: Fuel. 81 (2002) 829-835 [4] Xinming Yuan, Genhai Mao and Shiqiao Zhang: Journal of Hydroelectric Engineering. 4 (1999) 60-66 [5] ICEM CFD 14.5 User’s Guide.Ansys Inc

A classical bubble growth model has been used in the simulation.
The mass transfer between the gas-liquid was also included in this simulation.
In addition, the bubble growing simulation can also be visualised using CFD.
After the validation of the CFD-PBM approach, the same simulation case was repeated with 3 different bubble clusters with initial size of 0.3, 0.6 and 1.2 mm.
The bubble growth model had been successfully incorporated in the CFD-PBM simulation.

Simulation model 3D model.
Fig.1 The cover and pressure plate Fig.2 CFD model CFD set up.
Open the CFD model, which is already been meshed, in ANSYS CFX [7] module.
From the view of numerical analysis, the problem of clutch CFD simulation is how to deal with the interaction between clutch and the air around it.
CFD simulation analysis of vehicle engine colling fan and aero-acoustic reduction research [D].

In the paper CFD is applied to a rotor at stationary hydrodynamic conditions Simulations from the numerical prediction are compared with experimental measurements of the model of MCT which is experimented on in a cavitation tunnel and a towing tank.
Comparisons between experiments and numerical simulations at 5o set angle.
Comparisons between experiments and numerical simulations at 10o set angle.
Comparisons between experiments and numerical simulations at 13o set angle.
For TSR > 7 both CFD simulations tend to over predict the power coefficients for set angles 5°-13°.

CFD Research and Investigation of 2011 P4/5 Competizione Rear Wing Aldo Pugliese1,a, Yang Zhigang1,b, Li Qiliang1,c 1Shanghai Automotive Wind Tunnel Center Tongji University Shanghai, 201804, China aaldo.pugliese88@gmail.com, b zhigang.yang@sawtc.com, cqiliang.li@sawtc.com Keywords: Race car rear wing; Downforce and Drag; CFD simulations; Slot gap Abstract In order to analyze the influence of the rear wing of a competition race car on the aerodynamics of the whole vehicle, computational fluid dynamics simulations have been performed.
In particular, it has been analyzed through 3D CFD simulations, which kind of contribution the rear wing provides in terms of drag and lift and how the modification of the angle of attack of the two airfoil shape elements and their interactions may influence the aero-performance of the car.
a) Middle and small box b) Tunnel, middle and small box Fig.4: Mesh models of the computational domain Computational method Computational fluid dynamics (CFD) commercial software – Ansys FLUENT has been used to perform the simulation; it solves the three-dimension incompressible Reynolds Average Navier–Stokes equations in finite volume approach.
Configurations 1 and 2 have the same set-up, but simulation has been performed respectively with rotational and non rotational wheels.
CFD study of section characteristics of Formula Mazda race car wings[J].

Student, Mahran Dawwa1* 1Constanta Maritime University, Constanta, Romania 1mahrandawwa@gmail.com Keywords: CFD, eddy dissipation model, combustion, diesel engines.
The aim of this study is to simulate the combustion process in the combustion chamber of diesel engines by using eddy dissipation model (EDM) and computational fluid dynamics method (CFD).
The simulation steps and the simulation results will be discussed and illustrated.
Sunnapwar, CFD Modeling and Experimental Validation of Combustion in Direct Ignition Engine Fueled with Diesel, International Journal of Applied Engineering Research, Vol. 1, No. 3, 2010
Anang, Multidimensional CFD Simulation of a Diesel Engine Combustion: A comparison of Combustion Models, Proceeding of the FISITA 2012 world automotive congress, Lecture Notes in Electrical Engineering, 190 (2012) 879-893.

It is indicated that the computational fluid dynamics (CFD) method can be applied to simulate the flow field, and the optimization design of the cathode can be guided according to the results of simulation.
The software of computational fluid dynamics (CFD) method is applied to analyze the simulation of the numerical model and guide the design and optimization of the cathode flow field.
The simulation results are obtained as shown in Fig. 9 and Fig.10.
It is indicated that the computational fluid dynamics (CFD) method can be applied to simulate the flow field, and the optimization design of the cathode can be guided according to the results of simulation.
Journal of System Simulation Vol.21 (2009) No.1, p.73-75 [6] F.J.