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However, CFD simulation ,as an inseparable part of engine design, has helped researchers and engineers to overcome these problems.
Engine designers take advantage of CFD simulations to develop better understanding of different stages of engine cycle to be able to make engines satisfy stringent emission and fuel consumption standards[8].The KIVA-3V code is one the effective CFD tools that has been developed in Los Alamos laboratory to help studying the whole engine process through three dimensional modeling..
The mesh that is used in the CFD simulation is shown in Fig.2 The mesh is generated by ICEM-CFD.
Mesh generated in ICEM-CFD KIVA-3V is a CFD code that solves the Navier-Stocks equation for three dimensional, unsteady, compressible, turbulent and reacting flow.
"In-cylinder airflow of automotive engine by quasi-direct numerical simulation."

Thus, the development of numerical optimization and simulation software becomes a tool for achieving results through virtual simulations only, without the immediate need for prototyping, reducing time and costs in project terms.
The use of CFD resources in the design and development of products is attractive mainly due to reduced cost by reducing experimental attempts [1].
Metodology The CFD simulations are performed using the ANSYS CFX® software that uses the finite volume method to perform the fluid dynamic calculations.
Simulation results compared with experimental data.
Thermal-Hydraulic CFD Study in Louvered Fin-and-Flat-Tube Heat Exchangers.

Based on these advantages the paper using CFD knowledge and the FLUENT software, using RSM turbulence model, SIMPLE algorithm, simulation class D landform, to have numerical simulation of average wind pressure coefficient for of the circular planar and saddle roof building (GB50009—2001,2006.)
CFD Numerical Simulation Control equations.
(Zhou2009).In this paper, the numerical simulation of selected RSM model.
Figuer 4 The mean wind pressure coefficient distribution of circular plane saddle roof surface (zero degrees wind angle) Conclusions CFD numerical simulation technology is a new research method, for the study of mean wind pressure distribution of complex building surface provides a convenient, fast, low-cost ways.
[5] Wang, F.J., Computational fluid dynamics analysis of CFD software theory and application [M].

Numerical simulation of equipment parameters is done through CFD software (Fluent, Gambit), which provides credible basis for thorough research and equipment design.
In this paper, numerical simulation of equipment parameters is done through CFD software (Fluent, Gambit), which provides credible basis for thorough research and equipment design.
Before CFD computing on special problem, calculating area must disperse by messing.
Fig.3 to 5 is simulation results of the particle tracks, dynamic pressure, tangential velocity with different nozzle angle.
Wang: The Principle and Application of CFD Software (TSINGHUA University Press, China 2004).

Numerical Simulation of Unsteady Flow in a Submersible Axial Flow Pump Xiaoxu Zhang1, a , Hongming Zhang1,b and Xiaoping Li2,c 1Faculty of Civil and Architectural Engineering, Kunming University of Science and Technology, Kunming, 650224, China) 2Yunnan University of Finance and Economics, Kunming, 650500, China) azhangxiaoxusky@126.com, bhmzhang8888@126.com, clxping@myopera.com Keywords: CFD, Star-cd, Submersible Axial Flow Pump, Navier-Stokes equation, Unsteady Flow Abstract.
Based on N-S equations and Standard turbulence model and SIMPLE algorithm, a CFD analysis was made of the full flow passage in this type of pump.
CFD technology in the pump design can be more accurate understanding of inner flow field.
The governing equation of fluid N-S equation is applied in numerical simulation of the full flow passage in this type of pump.
[5] E.E EIhadi,Lei Xiaosong and Wu Keqi.Numerical Simulation of 2D Separated Flows using two different turbulence models[J].Paskistan Journal of Applied Sciences ,2002,2(12):1057-1062.

Numerical simulation based on CFD for the movement field of the hydraulic poppet valve Xiong Shi1,a，Jun Chen2,b 1Department of Electrical & Information Engineering,Wuhan Polytechnic University,Wuhan, China 2Naval Architecture ＆Power Engineering College,Naval University of Engineering,Wuhan, China aE-mail:stonehero@163.net,bE-mail: chenjun758@sina.com Keywords:poppet valve; computational fluid dynamics; dynamic mesh; flow field; numerical simulation Abstract.
With the development of computer technology and computational fluid dynamics (CFD) theory, the simulation and the visual analysis for the internal flow field within the hydraulic poppet based on CFD were very hot in the area of hydraulic pressure recently [1-3].
To study the influence of spool movement on its internal flow field and realistically simulate its internal flow field, based on finite difference method, in this paper the CFD software Fluent dynamic mesh technology is used in the numerical simulation research of the internal flow field and the flow field change caused by the spool motion is analyzed.
Numerical simulation of the movement field of the hydraulic poppet valve has high authenticity and is important to other numerical simulation of movement field.
Quan, “CFD Simulation of Noise Characteristic of Coaxial Hydraulic Relief Valve with Three Stages,” Zhendong Ceshi Yu Zhenduan, 2009, 29(1), pp. 71-73

CFD Solver and Boundary Conditions.
Two simulation groups were performed; i.e. the ‘cold’ flow simulation for quantifying total pressure loss and the ‘warm’ flow simulation for evaluating pin-fin and end wall heat transfer, corresponding to the experiments.
Figure 2a gives CFD predicted friction factors at each Reynolds number, in comparison with those from experimental measurements.
Comparison of CFD prediction against test data.
Figure 3 illustrates the variations of CFD predicted HTC along the pressure side end wall in comparison with test data.

Nowadays, the computer simulation has developed significantly and applied widely in industries.
The simulation dynamics are supported by the strong software and hardware.
CFD method approaches to analyze flow dynamic in lobe pump.
The CFD simulation 2.3.1.
The grid model for lobe pump In the CFD simulation, the water-liquid is Newtonian and incompressible, its viscosity of 0.001003 kg/m-s, the density is 998.2 kg/m3.

Study on Flow Rate and Steady Flow Force of Hydraulic Combination Valve Based on CFD Jinyan Shi1, a 1 Hunan Railway Professional Technology College, ZhuZhou HN412001, P.
This paper analyzes flow field of the combination valve based on the CFD software.
Fig. 1 Structure dimension of combination valve While implementing CFD analysis of the combination valve, hydraulic oil is chosen as flow medium.
The main parameters of flow field simulation: inlet pressure is 24MPa, the outlet pressure is 21MPa, the oil density is 870, and dynamic viscosity is 0.0261.
Analysis of the simulation results of flow field 4.1 Flow characteristics of the valve Fig.3 shows the flow field calculation results of the combination valve port.

In this paper , by using CFD method and getting benefit from the established CFD software, we gave external velocity field and pressure field of the car.
Method of Analysis In the CFD analysis, the computational domain was set to be46m in length, 10.85m in width, and 8m in height for the car.
The generic car model was chosen, not limited to a sedan, for the sake of showing the general meaning of CFD analysis.
Fig. 2 illustrates the computational field of the CFD simulation.
Numerical simulation on characteristics of turbulent flow around two cars driving side-by-side[J].