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The simulations were carried out on a model of a simplified three-coach train and typical cross-section of Chinese high-speed railway tunnel.
For the complete picture of the flow field would be presented in detail, the application of CFD becomes attractive with the advent and development of modern high-performance computers.
The geometry of the computational domain is depicted in Fig. 1, The CRH2 based on CSR Sifang Locomotive and Rolling Stock is selected in simulation.
Results and discussion In the present section, the numerical method outlined above is applied to the simulation of flow field.
The calculation of train slipstreams using Large-Eddy Simulation.

Computer room cooling performance directly affect the operation of the engine room, the air conditioning out of the wind through the method to build a three-dimensional simulation of the engine room to explore the room hotspot locations, and to optimize the configuration of the cabinet task according to the engine room heat distribution.
Using the Fluent Fluid Dynamics processing software provides simple algorithm to simulate the flow and temperature fields of the simulation engine room, the idea of sampling point using the model output parameters, use the function fitting, build a function of the wind speed of the air speed sampling point obtained reasonable outlet velocity.
To solve the problem of the whole room must be the point velocity for simulation, we use fluent software simple algorithm model. 1.
Uncoupled implicit algorithm (Segregated Solver) The algorithm derived from the classic SIMPLE algorithm .It is applied to the low-speed flow of CFD simulation. 2.
The temperature field obtained based on the thermal conductivity of iron each radiating surface heat flux 22.627W/m2, Fluent repeated simulation as boundary conditions to reach steady state until the model space.

Through the roll in the process of fixed canard trajectory correction kit flight direction by moment analysis and simulation, then electromagnetic torque values range is determined.
Control effect of electromagnetic torque simulation, determine from the electromagnetic torque to meet the requirements in the process of correction.
Use a grenade outside the 7 -DOF trajectory model simulation, the projectile during flight fixed Canard roll angle correction component changes shown in Figure 6.
Wind tunnel tests and open-loop trajectory simulations for a 155mm canards guided spin stabilized projectile.
CFD and Parametric Study on a 155 mm Artillery Shell Equipped with a Roll-Decoupled Course Correction Fuze. 29th AIAA Applied Aerodynamics Conference 27 - 30 June 2011, Honolulu, Hawaii

Rajurkar※d *State Key Laboratory of Mechanical Systems and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China ※Center for Nontraditional Manufacturing Research, University of Nebraska-Lincoln, USA a:lgu@sjtu.edu.cn, b:sjtu.sanshi@yahoo.com.cn, c: zws@sjtu.edu.cn,d:krajurka@unlnotes.unl.edu Key words: EDM, bunched electrode, CFD simulation, radial shallow crater Abstract: This paper aims to introduce the performance of bunched-electrode for die-sinking EDM.
In order to compare the flushing effect between bunched electrode and solid electrode with single hole, finite element method was applied to analyze the flushing fluid in between the gap of the electrodes separately. 2.1 Geometric model and fluid simulation conditions Both the bunched electrode and solid electrode has a hexagon contour about 440mm 2.
And the outlet pressure was the environmental pressure. 2.2 Simulation results and discussions The simulation results of dielectric fluid field of EDM with solid electrode and bunched electrode are shown as Fig.3 (a) and (b).
According to the simulation result, the fluid flow velocity increases rapidly from less than 0.1m/s to above 0.8m/s near the flushing-hole, and then decreases gradually to 0.1m/s along its flowing direction till the outer side of the electrode.
Simulation by FLUENT indicates that the outlet velocity of the dielectric fluid around the peripherey of the working area could exceed 15m/s when the inlet velocity is 1.01m/s.

Study of the Phenomenon of Water Hammer Based on Sliding Mesh Method Lanlan Guo1,2,a, Jie Geng1,b, Shuo Shi3,c ,Guangsheng Du1,d 1School of Energy and Power Engineering, Shandong University, Jinan, 250061, China 2Electromechanical College of Shandong University of Science and Technology, Qingdao, 266590, China 3Key Laboratory of Renewable Energy Utilization Technology in Building of National Education Ministry,Shandong Jianzhu University, Jinan, 250101,China agllgo@163.com, bgj_8944@163.com, cshishuo@sdjzu.edu.cn, ddu@sdu.edu.cn Keywords: water hammer; numerical simulation; sliding mesh; variable density Abstract.
In this paper, the methods of characteristic and sliding mesh are used to the water hammer simulation and be analyzed and compared.
Method of CFD Sliding Mesh.

Nookuea et al. carried out the simulation of CO2 absorption using cascade mini ring packing [5].
These researches used Aspen Plus as a simulator and produced simulation results in the absorber output.
Results and Discussion The operating parameters used in the simulation are shown in Table 1.
Simulation results show that convective flux is about ten times higher than the diffusive flux.
Drobniak, CFD modelling of CO2 capture, Chem.

Note that a generic 50 mm length [L] and proportional distance from the hot surface to the nearest point in the cooling gallery is kept constant throughout the simulations.
The test methodology consists in using a well-known CAD Flow Simulation tool in which a control volume is established to resemble each geometry to be tested.
Flow Simulation Model The Flow Simulation tool applied is adequate to test ideas and conceptual design, it is another take on the Navier-Stokes equations that all the other CFD tools.
And the slotted design not being the most complex is the one that required up to five times more processing time in these simulations.
Dumnov, "Numerical Basis of CAD-Embedded CFD," February 2014.

A thermosetting coupling model of a hot-film sensor was established based on CFD which is used to simulate dynamic response characteristics; the temperature field of the hot-film flow sensor probe was simulated.
Results of experiment test and computational simulation Figure 8 shows the sensor voltage and the simulated curve with the effect of step pulse airflow.
The response time obtained in test is longer than that obtained by simulation.
The boundary conditions used in simulation is a constant temperature of heating resistor.

Optimization of Channel Dimensions in the Flow-field for PEMFC Leping Wang1,a, Lianhong Zhang1,b and Junpeng Jiang1,c 1School of Mechanical Engineering, Tianjin University, Tianjin, 300072, China a wlphappy@163.com, b zhanglh@tju.edu.cn, c ejjp_83613@163.com Keywords: PEM fuel cell, Bipolar Plate, Flow-field, Consumption Rate, Design of Experiment, CFD.
Based on the half-cell model for the anode side numerical simulation is carried out with computational fluid dynamics software Fluent.
Fig.2 Half-cell cross-section of the PEM fuel cell Orthogonal Experimental Design of Simulation.
Table 3 shows the orthogonal analysis of computational simulation results of 30*FC.
Secondly, the orthogonal experiments are designed to guide the numerical simulations.

Fig.4.The comparison of engine power Fig.5.The comparison of engine torque The results of simulation calculation indicate chances of external characteristic effective power and effective torque caused by adopting cracking sound attenuation coupler do not exceed 0.65%. 4.3 Calculations for backpressure The backpressure of the exhaust system for the reduction amount of pressure generated by the airflow through the catalytic converter and muffler, namely, and represents respectively the average value of total pressure of the front-end and back-end of the three-way catalytic converter.
Fig.6 is a comparison of the simulation results between original muffler and cracking sound attenuation coupler, and as can be seen from figuer9 the trend is basically the same, but cracking sound attenuation coupler value is higher than simulation value.
(3)The experimental contrast verifies the correctness of numerical simulation model founded in this paper of coupling working process between the engine and exhaust system.
Computational fluid dynamics (CFD) analysis [M]．Beijing： Tsinghua Publishing House, 2004