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The Vehicle Dynamical Analysis of a High-speed Train Passing through a Tunnel FENG Zhi-penga , ZHANG Ji-ye b and ZHANG Wei-hua Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, China a zhipengfeng1@163.com, b jyzhang@home.swjtu.edu.cn Key words: Tunnel; High-speed train; CFD; Vehicle dynamics; Aerodynamics force Abstract.
With the numerical simulation, the variation of aerodynamic forces was obtained.
By applying the computational fluid dynamics (CFD) and the computational multi-body systems dynamics, the process of a train traveling through a tunnel at the speed of 350km/h was simulated numerically.
Figure 4 shows a typical time-pressure curve of the surface measuring point on train body which Figure 4 (a) for the simulation result and Figure 4 (b) for the test result.
[5] Masahiro SUZUKI, Atsushi IDO, Yutaka SAKUMA, Hiroshi KAJIYAMA: Full-Scale Measurement and Numerical Simulation of Flow around High-Speed Train in Tunnel.

Numerical Simulation Study of Coal Gangue Piles Influence on the Wind Pressure Distributions of Coal Reservoir Roofing Zhixiang Yin1, a, Chengjie Zhang2,b 1Institute of Civil Engineering and Transportation, Liaoning Technical University, Fuxin123000, P.
China alntuyzx@163.com, bzcj198642@126.com Keywords: coal reservoirs, coal gangue, numerical simulation, wind coefficient, influence Abstract.
Therefore, this paper studies the impact of the waste dump on the wind pressure coefficient, based on the proven reliability in the numerical simulation[3].
Numerical wind tunnel method is based on computational fluid dynamics (CFD), and simulates wind field changes around the structure and calculate the wind load on the structure surface by the computer [4].
Examining the k-ω model by means of a wind tunnel test and large-eddy simulation of the turbulence structure around a cube [J].

In the numerical simulation of water-entry impact at high speed, natural cavitation must be taken account as well as six degrees of freedom, so we integrated these two kinds of methods to make numerical simulation.
So, it is very important to research on the influence of mesh method to numerical simulation.
Simulation example Calculating zones The far-field of whole computational domain is defined as pressure boundary.
Numerical simulation of undersea cable dynamics.
Computational Fluid Dynamics and Applications –Principle and Applications of CFD Software[M].

In this paper, the numerical simulation analysis of jlu fsae racing car aerodynamic character based on star-ccm+ was introduced.
Numerical Simulation Overview Model of Simulation.
Based on the star-ccm+ software, we do a external flow field numerical simulation of the jlu fsae car.
In this paper, by comparing the simulation results of the four kinds of condition for the car flow field numerical simulation, we search for the appropriate boundary condition setting and study the influence to simulation results by the rotation of the wheels.
Howell.The Use of CFD to Predict the Aerodynamic Characteristics of Simple Automotive Shapes [C]//SAE Paper 980036

CFD analysis was developed to determine the numerical data.
Boundary Conditions The applied boundary conditions in this simulation are common for an incompressible flow.
[3] Gertzos, K.p, Nikolakopoulos, P.G, and Papadopoulos, C.A., CFD analysis of journal bearing hydrodynamic lubrication by Bingham Lubricant, Tribology International, 2008, 41, 1190-1204

An ideal strategy of operation can be generated by analyzing the results of the simulation.
The most exact approach to model the entire process is the use of Computational Fluid Dynamics (CFD).
Steady CFD simulations are used to increase the quality of the process model like determining the heat transfer by different operation modes.
The mass per charging is increased by 100 kg at every simulation run.
Konferenz ASIM/GI-Fachgruppen: Simulation technischer Systeme, in Lippstadt.

Figure 6 is the numerical simulation of the overall distribution of the radial slip velocity.
Advances in Numerical Simulation of Working Process in Gasoline Engine [J].
Numerical Simulation of Air Flow in an Engine Inlet Port[J].
The Application of CFD in Designing Internal Combustion Engine [J].
Study on the 3D Simulation of Combustion Process of the Gasoline Direct Injection Engine[J].

In order to support this idea, effective C/Si ratio was calculated by a multiphysics simulation software [7] with SiC CVD reaction analysis module [8].
[7] https://www.esi-group.com/software-services/virtual-environment/cfd-multiphysics/ace-suite/ cfd-ace [8] http://www.str-soft.co.jp/product/cvdsim.html

Access to high-sulfur gas field blowout accident simulation software interface, users can choose the two types of channels that are simulation with step prompt channel and fast simulation channel, shown in Figure 4.
User-friendly interface, just enter a through numerical simulation of blow-related basic parameters, to complete high-sulfur gas field blowout accident simulation.
Simulation and analysis of the consequences of blowout accident in Kaixian based on Fluent.
FLUENT Fluid engineering simulation and application examples.
Computational Fluid Dynamics Analysis, Principle and Application of CFD software.

Introduction During the design of hydraulic machinery, processing and numerical Simulation Study, generally need to create an accurate physical model.
With the CFD technology is widely used in the field of hydraulic machinery, the modeling capabilities of researchers is also increased correspondingly.
The establishment of an accurate physical model is an important first step if researchers want to obtain accurate simulation results.
Accurate three-dimensional digital model is required in the numerical simulation study on the runner, if the modeling method is incorrect, that may lead to abnormal irregularities and bring the error to the simulation results.
When conduct the numerical simulation, due to the narrow blade and a larger degree of spatial distortion, coupled with the combination of long blades and short blades, there is a certain degree of difficulty to establish the model, improper methods are likely to have an adverse impact on the results of simulations.