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In hydraulic transient calculation, the surge tank impedance coefficient can be calculated by Gardel formula, model test or CFD[8-10].
As shown in figure 5 and 6, simulation results are in good agreement with the measured curve.
Fig.7 Active power curve of Unit 1 Tunnel and surge tank model considering structure coefficient which approximatively described by piecewise function was used in the simulation, and the simulation results and record curve are shown in figure 7.
We can see that the simulation model has high precision.
This method can improve accuracy of simulation model obviously

., Qiqihar Heilongjiang Province, China ahustyuxiaodong@163.com, bxiawa-1972@163.com, cwbdoctor@sina.com Keywords: Annular cavity, Multi-pad, Hydrostatic thrust bearing, Temperature field, Simulation research Abstract.
A simulation research concerning temperature field of hydrostatic thrust bearing having annular cavities multi-pad was described in order to solve the thermal deformation of the hydrostatic thrust bearing with annular cavity multi-pad in the heavy CNC equipment.
The simulation results indicate that an improved characteristic will be affected by rotating velocity easily, and oil cavity temperature increases by gradually with rotating velocity enhancing.
Numerical simulation Model of multi-pad.
Three-dimensional geometry model of the oil film is produced by software UG, then the model is introduced into the pre-processor ICEM CFD to generate grid.

The comparison and analysis, under the certain vacuum degree of the vacuum chamber, was done between the simulation and the experiment.
And the differences of the vacuum degree in the chamber, the temperature change of the cabbage, the relative humidity in the chamber and the cabbage mass loss, in the experiment and the simulation, were all recorded.
Da wen Sun, Ze hua Hu, CFD simulation of coupled heat and moisture transfer through porous foods during vacuum cooling process, International Journal of Refrigeration, 19-27, (2003)(26) [8].
Da wen, Sun Ze hua Hu, CFD predicting the effects of various parameters on core temperature and weight loss profiles of cooked meat during vacuum cooling.

The computer simulations were validated by the analytical solution results.
The CFD software is used for the numerical simulation, in which the Finite Volume method is adopted for the governing equations discretization; The SIMPLE method is applied to deal with the linkage between pressure and velocities.
And the local fRe obtained from simulation was compared with analytical solution showed by Yilmaz[6], which shows excellent agreement, as depicted in Fig.2
The Nusselt value obtained from simulation agreed with the theoretical value showed by Shah[7].
Fig.3 Effect of Reynolds number on the fRe Fig.4 Local Nusselt numbers Conclusions In this work, numerical simulation for fluid flow and heat transfer in the rectangular microchannel cooling passages are conducted.

Numerical Study of the Intake Temperature on Gasoline Engine Lin-pei HAN1,a, Wei HONG1,b, Yan SU1,c, Fang-xi XIE1,d, Yun XU1,e 1State Key laboratory of Automobile Simulation and Control, Jilin University, Changchun, 130025，China ahanlinpei1988@126.com, bhongw@jlu.edu.cn, csuyan@jlu.edu.cn, dxiefx2011@jlu.edu.cn, exuyun@jlu.edu.cn Keywords: intake temperature, combustion, pumping loss, emissions Abstract .The optimum inlet temperature for different engine conditions was calculated based on the same knock probability with full load by CFD Fire software, and then the effects of inlet air heated on combustion，pumping loss and emissions of gasoline engine were also studied.
Therefore, the work in this paper mainly studied the optimum intake air temperature of different engine condition and the effect of intake air temperature on combustion and emission performance by CFD software AVL-FIRE.
Table 1 Engine specifications Engine L4,16-valves Stroke [mm] 84.2 Displacement [Liter] 1.798 Bore [mm] 82.5 Connecting rod length [mm] 148 Compression ratio 9.6 Figure1 Computational mesh for FIRE simulation Usually, computational accuracy was significant affected by boundary conditions and initial conditions.

The simulation model of blades in PECM.
Coupling Simulation Coupling Method.
Material and Simulation Parameters．In this simulation, the materials of the cathode and anode are Ti-6Al-4V and electrolyte is NaNO3 solution.
Simulation parameters.
Turbulence Modeling for CFD. 2nd ed.

But the side roughness analysis usually requires a simulation with individual particles considered.
This efficient way avoids the time-consuming calculation of multilayer simulation, but including the key parameters of whole process.
This was carried out by the computational fluid dynamics (CFD) model.
The following simulation cases are all meet this requirement and thus the morphologies of tracks are analyzed in terms of side surface.
Fig. 4 Side roughness under different heat input, data from both simulation and independent literature.

The result of numerical simulation is forward-looking, it can predict law of explosive ignition.
Since then, a lot of cook-off numerical simulation had been conducted.
CFD software was applied to simulate the model above.
The cook-off test and its numerical simulation of RDX[J].
Numerical simulation of cook-off for explosive at different heating rates[J].

The measured results were compared to simulation results.
Simulation.
These values are in agreement with a preliminary simulation of the high pressure gas quenching using the CFD-program Fluent [12].
A 3 dimensional simulation of the case hardening process using a position dependent heat transfer coefficient taken from a CFD-simulation of the gas flow may also help improving the results.
In order to improve the simulation results, 3 dimensional simulations with enhanced streaming simulation of the gas quenching process should be employed.

Performance Analysis of Bionic Propulsion Device above Water in Different Parameters Xianghua BAI1, a, Fenghe TAO2, b and Jiangang LV3, c 1,2,3Machine Engineering College, Shijiazhuang Hebei, 050003, China baixianghua@163.com Keywords: Amphibious vehicle; Bionic propulsion; Angle; Immerged in water; Simulation Abstract: This paper mainly researched on hydrodynamics performance of a wheel-blade bionic propulsion device designed based on the mechanism of a basilisk lizard treading water, when immerged in water and in different angles.
Fig.1 The theory analysis of basilisk lizard Fig.2 The wheel-blade bionic propulsion treading water device immerged in water Simulation and Analysis Modeling and Simulation enactment.
In the simulation，adopted RNG onflow model[3], for this model has perfect performance to solve the hydrodynamic problem, Applied UDF to define the angle velocity of the bionic impeller as , and then initialized up-half part of control box as air and the other was liquid.
Through the simulation and analysis hydrodynamics performance of the bionic propulsion device immerged in water and in different angles, summarized the rules and features of the revolving movement for bionic impeller and established the groundwork of optimizing the design of the bionic propulsion device further.
[3] Fujun Wang:The Theory and Application of CFD Software(Tsinghua University Press, Beijing 2004),in Chinese