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Fig. 1 Schematic illustration of a computational domain for PEMFC simulation.
Numerical model In this study, CFD programs based on STAR-CD version 4.12, a commercial finite volume technique solver, and ES-PEMFC version 2.40, were used to solve the fully coupled governing equations.
Fig.1 illustrates the computational domain for CFD-based PEMFC simulation which consists of two bipolar plates, the anode and the cathode gas channels, the anode and the cathode gas diffusion layers (GDLs), and MEA on active area of 25 cm2.
Numerical simulations were performed to compare the performance-related parameters of PEMFC for the SFFSB with those for the CASFF, focusing on pressure drop, discharge of condensed water, uniformity of current density over the entire surface area, and maximization of power density.

Anlin Wang et al[4] proposed Multidisciplinary Optimization of a hydraulic slide valve and the response surface function of transient hydrodynamic force acquired, but they use the method based on CFD analysis.
Simulation Model and Boundary Conditions According to the parameters of high-flow control valve, the nominal diameter, total length and stroke are 7.874in, 27.5591in and 3.1496in respectively.
References [1] FENG Weimin, HAN Ning, “Numerical simulation of optimum design of large diameter cyclic type regulating valve,” Engineering Journal of Wuhan University,Vol 39(1).p.76-79,(2006).
(In Chinese) [2] Han Xu, Zheng Ming Guang, “Hydrodynamic characterization and optimization of Contra-push check valve by numerical simulation,” Annals of Nuclear Energy, Vol 38, Issue 6, p. 1427-1437,(2011).
[4] WANG An-lin, WU Xiao-feng, ZHOUCheng-lin, “Multidisciplinary Optimization of a Hydraulic Slide Valve Based on CFD,”JOURNAL OF SHANGHAI JIAOTONG UNIVERSITY, Vol44(12), p.1767-1772, (2010).

The simulation results indicate that the tangential velocity in exhaust pipe outward the radial direction increases gradually, and presents the vortex structure.
Pourquiéb et al: Prediction of strongly swirling flow within an axial hydrocyclone using two commercial CFD codes.
Zheng: Evaluations and modifications on Reynolds stress model in cyclone simulations.
Raju et al: CFD simulation and experimental validation studies on hydrocyclone.
Holtham: Large eddy simulation of hydrocyclone¾prediction of air-core diameter and shape.

Based on the finite volume method and the pressure-velocity coupling scheme of the SIMPLE algorithm with the standard k-ε turbulent model, a CFD software was used to solve the Navier-Stokes equations to figure out the pressure in the bearing gap and the housing gap.
Analytical Approach Based on the finite volume method, this study utilized the laminar flow module of the CFD software, FLUENT, to solve the three dimensional Navier-Stokes equations to compute the pressure of air flow in the bearing gaps and the housing gaps in an aerostatic spindle.
In order to simplify the numerical simulation, the following assumptions were made for the flow field: (1).
Simulation models (a) (b) Fig. 1 (a) Cross section of the aerostatic spindle module.
Rao: Simulation based on FLUENT and experimental research of porous aerostatic bearing, Master Thesis, Harbin Institute of Technology, China (2006) [3] J.M.

The numerical simulation of flow field of a new rectangular suction inlet installing guide plates with different rake angles was carried out by means of the K-ε turbulence model based on the Fluent hydromechanics calculation software.
The numerical simulations of flow field for this suction inlet were carried out by using K-ε turbulence model based on Fluent hydromechanics calculation software.
Sucktion inlet Simulated surface (a) Physical model (b) gridded model Fig.1 The dimensions of physical model and its gridded model Flow analysis and structure optimization Computational Fluid Dynamics (CFD) is a combination of modern fluid mechanics, numerical analysis and computer science.
It is possible for some physical phenomenon, such as fluid flow and heat transfer, to get system analysis by using the computer simulation and image display of CFD.
Fig.6 Experimental result Summary The numerical simulation of flow field of the rectangular suction inlet installing guide plates with different rake angles was carried out by using the K-ε turbulence model based on Fluent.

Study on the Mixer Used for the Thermal Flow-Reversal Reactor Yongqi Liua, Xiangchun Chenb, Ruixiang Liuc, Zhenqiang Gaod, Jingtao Wange School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo, 255049，China aliuyq65@163.com, bchenxiangchun127@163.com, clrxdlut@sina.com, dsdgaozq@163.com, ehitao0906@163.com Keywords: Mixer; Coal Mine Methane; Ventilation Air Methane; Thermal Flow-Reversal Reactor; CFD Abstract.
Schematic diagram of the mixer Simulation Model.
In order to optimize and improve the design, the mixing process is studied by using CFD software-Fluent.

The unsteady aerodynamics associated with this microrobot was studied by using the method of computational fluid dynamics (CFD).
On the basis of numerical simulation, the Fluid-Structure coupling mechanics for flexible flapping-wings were studied and discussed.
According to the practically developed flapping-wing microrobot, a 2-D simulation model for flexible flapping-wings was established.
In the foundation of the numerical simulation, the variations of different parameters of the flapping microrobot were investigated, such as flapping amplitude, pitch amplitude and flapping frequency.
Finally wind tunnel experiments and flying test verified results of numerical simulation.

Due to the importance of studying the flow pattern around ARs of different shapes such as cubes, pyramids and triangular prisms, many studies have been conducted experimentally in wind tunnel, using Computational Fluid Dynamics (CFD) simulations to study the effect of geometry of these ARs on the flow pattern around them [15]-[16].
The results were then used to verify the numerical results obtained from finite volume method (FVM) simulations [17].
Computational Method Finite volume method was used in Ansys CFX for discretizing the fluid domains in all simulations for the helmet and the hollow cube ARs.
Numerical grid of helmet artificial reef for all Ansys Aqwa simulations Fig 5(b).
Numerical grid of hollow cube artificial reef for all Ansys Aqwa simulations Table 2.

These experiment data are very expensive no matter from the prototype experiment or computer simulation, so finding out the global model of the existing CCP etcher with less trials is necessary.
Typical etch fabrication process modeling and optimizing Xu and etc. have studied on a dual-frequency CCP etch chamber process, a 2D axisymmetric model of 300mm etcher is built in CFD-GEOM/CFD-ACE+, a popular multi-physics simulation software in semiconductor industry.
By orthogonal design, a group of plasma simulation experiments are carried out.
OPTIMUS software were adopted for the process modeling and later on RBF, Kringing and least-squares models are compared based on the simulation experiments data.
And it has been shown that error of the optimization and simulation result is less than 4%, it can give engineers good advice to modify etch input parameters.

An correlation of pressure relief area of the 220kV mail transformer room of indoor substation were presented based on the CFD tool FLACS modeling of the general designing schemes of the State Grid Corporation of China.
This can be done by applying the basic principle of the construction rules and the calculation of hydrodynamics, also through the investigation of indoor substation and the simulations on variety of explosions.
Explosion Simulation Analysis Explosive Pressure Selection.
By FLACS simulation, the local pressure can reach more than 27kPa which has a great destructive [10].
TNO multi-energy method in the application of steam cloud explosion simulation evaluation.