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Simulation result and theory analysis showed the models established in the paper performed better than the random walk model.
Due to the obvious advantages both in numerical simulations and theoretical studies, the bulk of the research effort has been directed at spherical particles.
So the random walk model is not appropriate to simulation the aerosol dispersion, which causes the simulation value of mass concentration larger than measurement and setting velocity smaller than measurement.
The non-spherical particle dispersion model which considers the gravity and particle shape can simulation the dispersion process of aerosol better, which was validated through experimental measurement and numerical simulation in another paper [6].
Mathematical Model and Numerical Simulation of Particles Dispersion with Gravity.

Numerical and Experimental Researches of 1:10 Tank Car Longitudinal Vibration with Fluid Sloshing Zhisheng Liu1, a, Jimin Zhang1, b, Yongqiang Wang1, a 1Institute of Railway and Urban Mass Transit, Tongji University, Shanghai, China, 201804 alzsfrank3@gmail.com, bzjm397a@163.com Keywords: fluid-structure coupling; tank car dynamics; numerical simulation; model experiment; CFD Abstract.
Since the flow field is wholly described by the fluid control equations, the result calculated can be more realistic than the traditional modal simulation, and the tanker dynamics simulation obtained by this method will be more accurate. 1.
Establishment of the fluid-tank simulation model 1.1 Simulation process In the numerical simulation, the program of three-dimensional model is very complex, and the study of such problem is usually simplified to two-dimensional model despite the loss of accuracy, but the basic law of the liquid sloshing can be obtained.
Coupled simulation process is as follows: (1) Set initial conditions.
The human body vibration simulation research during railway vehicle running[J].

Methodology of Real-Time Simulation The overall design process can be substantially improved through the inclusion of modern simulation tools.
X-plane is a commercial flight simulation program produced by Laminar Systems.
The data obtained from X-Plane simulation tests also confirmed these values.
We believe real-time simulation offers an exciting emerging technology.
As more designers utilize this capability there is little doubt that simulation in all its forms will take its place with finite element analysis (FEA), computational fluid dynamics (CFD) and computer aided design (CAD) as fundamental tools to address future technological challenges.

Figure 1 - Aircraft cabin model for 3D simulations.
The transient numerical simulations were performed to simulate first 60 s.
Grid Generation and Validation of the CFD Model.
In this study, Icem-CFD software was used to build the grid over the complex cabin and manikins (passengers) geometry.
Each case cost about 3 days to complete 60 s simulation.

A three-dimensional flow simulation method is employed to design the adjustable torque converter.
The performance of torque converter with the variation guide vanes is analyzed by using numerical simulation.
Simulation of the flow field The three-dimensional model of the guide vanes adjustable torque converter is shown in figure 5.
It is difficult to realize dynamic simulation of internal flow fields in the process of variational guide vanes angles now, so the static simulation methed is proposed.
The numerical computation of the internal flow field of torque converter can be realized by the software of CFD.

Two-dimensional flow field simulation of two-wing synchronous rotor and four-wing synchronous rotor mixer were studied and the simulation computation of the fluid-structure interaction in a real sense were realized with FEM software.
The FSI in ADINA is the real fluid-solid coupling instead of the pure movable boundary of the ordinary CFD software.
For the simulation process is in the late stage of mixing, it is assumed that the rubber tends to a uniform melt flow, and the force on the rotor will be very small and the waterway structure among the rotor will not affect the overall strength of the rotor.
（6） The speed of turning rotor is 60r/min, therefore =6.28 r/ s Simulation results and analysis Stress field.
Conclusion The following conclusion can be drawn from the simulation analysis

Analysis on Numerical Simulation for Bionic Robot Fish Based on CATIA Dejian Li School of Mechanical Engineering, Baicheng Normal College, Baicheng137000, China bcldj @sohu.com Key Words: Bionic; Tuna; Computational Fluid Dynamics; CATIA Abstract: Based on the problem that there is a relatively small number of analog simulations on swimming of fish a in specific fluid conducted by science researchers, a simulated tuna model is established in this paper, in which CATIA is used to construct the streamline shape of simulated tuna and the method of computational fluid dynamics is utilized to simulate the swimming of tuna in marine environment.
Through several times of comparison and comprehensive consideration, tuna is selected as the object for shape simulation.
Simulation Analysis and Experimental Research on Movements of Biotic Fins[J].
CFD Simulation of Fish-like Body Moving in Viscous Liquid[J].Journal of Bionic Engineering,2006,3(3):147-153 [7] Wojciech Kowalczyk, Antonio Delgado.
Simulation of Fluid Flow in a Channel Induced by Three Types of Fin-Like Motion[J].

Computational fluid dynamics (CFD) is one of the computer-based solution methods which are more widely employed in aerospace engineering.
With the help of MATLAB simulation we can solve the fluid flow around the airfoil subject to the defined aerodynamic and structural constraints within less computational time.
The best airfoil which gives maximum Coefficient of lift can be obtained by this simulation directly with less computational resources.
Selvakumar, “Optimum hierarchical Bezier parameterization of arbitrary curves and surfaces,” 11th Annual CFD Symposium, Indian Institute of Science, Bangalore, India, pp.46-48, August 2009

With the platform, the vehicle, system and parts can be designed, the intensity analysis, CFD simulation, control simulation and kinematics simulation can be carried out and the manufacture planning, material processing, process engineering and machine routing can be also made.
The digital simulation is classified as fast simulation for designers and multi-disciplinary coupled simulation for professionals.
The simulation refers to intensity analysis, motion simulation, fluid simulation, control simulation and etc.
The fast simulation mainly applies to the design of key parts.
In addition, they may carry out intensity analysis and all kinds of simulation.

Because combustion process of methanol is very complex, and the corresponding researches is most about the combustion phenomena by using CFD software[3]-[5], such as the changes of combustion temperature, combustion pressure, combustion flow and other combustion parameters.
The paper would firstly aim at the changes of intermediate products of combustion process about methanol and diesel micro-emulsion, and secondly analyze about the influence of methanol content on the combustion process, and finally validate the view of combustion mechanism form experiment of the power performances and emission characteristics. 2 Establish the combustion model Combustion mathematical model of diesel engine uses the basic control equations (the partial differential equations of momentum conservation, energy conservation and quality conservation).In addition, the study coupled with the simplified chemical kinetics model and CFD dimensional model to analyze the combustion and emission.
When the crankshaft was between 360 and 375ºCA, the simulated values was slightly larger than the experimental values, which was due to the fuel injection spray and so was ideal in the simulation, but the fuel injection atomization and film evaporation were complicated relationship processes in practice.
“Visualization Experiment and Numerical Simulation of Methanol and Gasoline Mixture Formation”.
“Simulation of catalytic reaction of methanol engine exhaust emissions”.