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Yuh Ming Ferng [8] developed a 3D full cell CFD model and investigated the effect the parallel and serpentine flow with different depth of flow channels.
The simulation has been solved by simultaneous equations like conservation of mass, momentum, energy, species, Butler–volmer equation, Joule heating reaction and Nernst equation to obtain reaction kinetics of PEM fuel cell namely mass fraction of O2, and H2O, pressure and current flux density distribution on flow channel.
Results and Discussions From the analysis of the models using CFD software package, the current values corresponding to the cell voltages were obtained.
[8] Yuh Ming Ferng, Ay Su, A three-dimensional full-cell CFD model used to investigate the effects of different flow channel designs on PEMFC performance, International Journal of Hydrogen Energy, Vol.32 (2007), p.4466 – 4476

Simulation Test Parameters.
The calculation area of the spiral tube in the CFD is the internal cavity of the model, 1 is fluid inlet, and 2 is the fluid outlet.
Fig.3 The area of CFD calculation Simulation Test Results and Analysis Effect of DOF on the Filling Time.
Simulation Test Sample.
Simulation Test Method.

Numberical Simulation of Labyrinth Screw Pump with Separated Structure by Fluent Jiaojiao Li1,a, Youchen Zhang2,b 1Beijing University of Chemical Technology, Beijng China 100029, China 2Beijing University of Chemical Technology, Beijng China 100029, China alijiaojiaobuct@163.com,bzhangyc@mail.buct.edu.cn Keywords: Labyrinth screw pump, Rotor and stator separated, Ring slots, Numerical simulation Abstract. 3D model and grid was conducted in Gambit,while single-phase flow field in the pump was simulated in CFD code-Fluent,by means of multiple reference frame (MRF) method, Renormalization group k-ε two-equation turbulence model(RNG k-εmodel) and Semi-Implicit Method for Pressure-Linked Equations (SIMPLEC) algorithm.
In the simulation,the author selected MRF model and SIMPLEC algorithm based on pressure-velocity coupling,and discreted velocity,turbulent kinetic energy and turbulent kinetic energy dissipation rate with second order wind format.
Simulation result Reference to the three different separated structure LSPs,there were ring slots between each separated sections,ring slot parameters did effect on the velocity and static pressure inside the pump.So,in the working condition that inlet flow Q=2.0m3/h,we did simulation of the three model flow field with different ring slot parameters respectively,and then analysed the relationship between the parameters and pumping performance and obtained the optimal ring slot parameters.
Conclusions The present study exhibited three new structure LSPs with rotor or stator separated,which was numerical simulated with Fluent in 3D model.The simulation results were analysed and the conclusions were as follows
(1)Numerical simulation was carried out on three structure pumps with different ring slot parameters,and found that optimal ring slot width makes pump performance the best were 5mm, 3mm,4mm respectively in rotor separated LSP,stator separated LSP and rotor stator all separated LSP

Numerical models and simulation approach Model geometry and mesh.
For the all scenarios analyzed in this study, the same grid size of 5μm is used to mesh the models for the CFD simulations.
The CFD simulation analysis on the combustor performance under different operating conditions has been reported in the previous sections.
Fig.5 shows the measured and predicted outlet temperatures between the measurements and the simulation.

Numerical Simulation of Gas-Particle Two Phase Flow in the Process of Cold Spraying Aluminum Zinc-Base Alloy Powder Chuanshao Liua, Jiangwei Chengb and Jianxin Zhengc Henan Polytechnic University, Jiaozuo 454003, P.R.
China alcs@hpu.edu.cn, bchengjiangwei.123@163.com, czhengjx@hpu.edu.cn Keywords: Cold spraying, Particle velocity, Gas-particle two phase flow, Numerical simulation Abstract.
The simulation results showed that the gas axial velocity and particle velocity increased when the gas pressure and temperature were increased, spray distance had little effect on the flow field in the nozzle, and small diameter particle was more easily accelerated.
Ju analyzed the supersonic free shot flow of compressible gas based on numerical simulation, obtained the distribution of gas pressure, velocity and temperature, and the effect of various parameters on flow field [4].
The Aluminum Zinc-base alloy gas-particle flow fields in and out of the nozzle are analyzed based on CFD software, and the influences of different processing parameters on gas velocity and particle velocity are studied in this paper.

The numerical simulation analysis.
Simulation results and analysis.
Numerical simulation analysis.
CFD simulation and assessment of life safety in a subway train fire[J].
Computer simulation study on personnel evacuating in metro station [J][J].

Numerical simulation study of the influence of structural parameters of combustion chamber on in-cylinder flow field of diesel engine Guocheng Li 1,a, Ping Sun 1,b, Peng Hu 1,c 1School of automobile and traffic engineering, Jiangsu University, Zhengjiang, China 212013 aguowuhappy@sina.com, bsunping@ujs.edu.cn, chptmisme717@126com.cn Keywords: Diesel engine; In-cylinder flow; Combustion chamber; Structural parameter Abstract: Based on the entity model of the type 4B26 diesel engine, calculated by CFD FIRE and combined with the software BOOST for the initial boundary conditions, the influence of combustion chamber structural parameters, such as boss height, surface-volume ratio and diameter-depth ratio of combustion chamber, on in-cylinder flow field of diesel engine was investigated.
According to Boost software, in the simulation result, the air inlet temperature, pressure and swirl ratio is taken as 385K, 0.18MPa and 2.03 respectively.
In Fire software, the gas flow simulation in the design cylinder solves the average transportation according to the mass conservation, momentum conservation and component conservation and the relatively accurate k-ζ-f turbulent flow model is adopted.
[2] Luo Maji,Wen Zui,Liu Gaofei,et al.numerical simulation of intake compression process for non-road diesel.Journal of Wuhan University of Science and Technology,2010,32(10):91~95 [3] AVL Fire User Manual[R].AVL List GmbH Graz,2002
[4] Luo Maji,Wen Zui,Liu Gaofei,et al.numerical simulation of intake compression process for non-road diesel.Journal of Wuhan University of Science and Technology,2010,32(10):91~95

The effects of pressure and humidity variations on pressure drop of the draw resistance standard rod Qian Miao 1, Jing Cheng 2, Hang Zhao1,a, Rong-Chao Yang 1 and Zhong-Di Su2 1 Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China 2 Department of mechanics, China Jiliang University, Hangzhou, China a ken0321@sina.com Keywords: Draw resistance standard rod, pressure and humidity variations, velocity distribution, numerical simulation, pressure drop Abstract.
Two factors have been selected to investigate the effects of environmental condition variations on pressure drop of draw resistance standard rods and a series of numerical simulations have been carried out.
Fig. 3 The sectional drawing of the rod Numerical Simulation and Results Analysis A common CFD software Fluent has been adopted to simulate the gas flow phenomena.
The present numerical results reveal that our simulation method is effective in calculating the pressure drop of the draw resistance standard rod.

Simulation of Cavitation Erosion in Different Throttling Pipelines Bin Zhu1, Yong Su2,a and Zhigang Li 3  1Modern Education Technology Center, Shenyang ligong University, Shenyang，Liaoning, 110159, China 2School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang, Liaoning, 110142, China 3Polytechnic school of Shenyang ligong university, Shenyang，Liaoning, 113122, China a yongsusyict@gmail.com (Corresponding author) Key words: throttling pipelines; cavitation erosion; simulation Abstract.
Luo et al. [1] calculated the typical characteristics of the cavitation erosion on the surface of the hydraulic turbine blades by means of computational fluid dynamics (CFD).
Osman et al. [5] theoretically analyzed the damages of cavitation erosion by means of numerical simulation.
Numerical simulation on cavitation erosion and experimental methods The design of throttling channels and experimental models and parameter conditions The structure of the throttling pipelines has big influence on the throttling effect.
Fig. 2 The diagram of the calculation meshing for throttling pipeline Calculation results The simulation on the throttling pipelines is conducted, and through calculation, the relative velocity profile in the throttling pipeline, pressure profile, the relative velocity profile at the outlet, velocity isoline distribution map, and the pressure isoline distribution map are obtained.

The engineers are most concerned about the optimal design, although the simulation software can reflect the genuine physical properties, but the simulation time is troubling them most.
To solve this problem, simulation optimization emerged algorithm is massively important.
The database stores simulation inputs and outputs, retrieval of existing simulation runs instead of running a brand new simulation when inputs and outputs exist in the database, filtering the experiment data, and comparing stored simulation outputs.
The approach saves the cost of a simulation run when a nearby data point already exists in the database (a simulation run is required if and only if a nearby data point does not exist in the database).
Future work includes applying this approach to high-dimensional design optimization applications using expensive finite-element models and computation fluid dynamics (CFD), and so on.