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The structure of half airtight cover is optimized by used of CFD, and the curve type is suitable shape to collect the dust.
The structure of collection cover is discussed, and optimized the structure of collection covers used by CFD.
Structure optimization of half airtight cover Two kinds of structure of half airtight are designed, which are straight line type and the curve type, compared their collection performance through CFD [6].
Through CFD computation, the collection performance of curve half airtight is better.
Li, in: Dynamics numerical simulation of cage-type bio-reactor, edited by R.

Computer simulation of icing on NACA0015 blade airfoil for vertical axis wind turbine Yan Li1,a, Fang Feng2,b, Shengmao Li1,c, Wenqiang Tian1,d 1 Engineering College, Northeast Agricultural University, China 2College of Science, Northeast Agricultural University, China aly_neau@yahoo.com.cn, b fengfang1026@yahoo.com.cn, clsmkey@163.com dtwq888666@163.com Keywords: Vertical axis wind turbine; icing; computer simulation; blade airfoil; CFD Abstract.
To simulate the situation of icing, computer simulations were carried out on a NACA0015 airfoil which is often used for vertical axis wind turbine.
Based on the theoretical foundation of CFD, computer simulations were carried out on a NACA0015 airfoil which is often used for vertical axis wind turbine.
Numerical Simulation Methods Mathematical Models The Reynolds and Mach number are so low that the air flowing through the blade can be considered as incompressible.
[4] Shengmao Li, Yan Li: Numerical simulation on the icing on a blade aerofoil used for vertical axis wind turbine, Journal of Chinese Society of Power Engineering, 2011, Vol. 31-3(2010): p.214-219.

Numerical simulation for unsteady flow around the vertical axis wind turbine (VAWT) was performed through computational fluid dynamics (CFD) software Fluent, which was based on the UDF controlled sliding meshes method.
With using wind tunnel test and CFD two methods respectively to simulate the air dynamics performance of small VAWT, the results showed the two dimensional simulation result is significantly higher than experimental and three dimensional simulation [4].
Turbulence Model The turbulence model used in CFD calculation is SST k-ω model, it mixed the advantages of the model and model, and it also merges the cross diffusion derived from the equation.
Numerical Simulation for 2D Unsteady Flow Around the Vertical Axis Wind Turbine.
Numerical simulation of aerodynamic noise radiated form vertical axis wind turbines.

At present, the gas turbulent flow model includes k-ɛ model, RNG model, Reynolds stress model, and the large eddy simulation.
While the large eddy simulation can directly simulate the large eddy of anisotropic turbulence.
CFD modeling and multi-objective optimization of cyclone geometry using desirability function, Artificial neural networks and genetic algorithms, Applied Mathematical Modelling.
CFD modeling of dense medium cyclone, International Journal of Coal Preparation and Utilization.
Flow simulation in industrial cyclone separator, Advances in Engineering Software.

One of the objectives is to develop a low cost simulation technique, which means using standard wall function to resolve the flow near the wall.
To the best of our knowledge, the performance of two-equation turbulence models still not been evaluated in the simulation of flow under neutral atmospheric boundary layer particularly for CEDVAL database.
Carissimo, Best practice guideline for the CFD simulation of flows in the urban environment.
Ketzel, Flow around a wall-mounted cube, 2002, http://www2.dmu.dk/AtmosphericEnvironment/trapos/cfd-wg.htm [10] M.
Seventh International Conference on CFD in the Minerals and Process Industries CSIRO, Melbourne, Australia, 2009.

But With the development of computational fluid dynamics (CFD) and multi-field coupling technology, economic and efficient numerical methods become the main direction of the current flow structure interaction problems.
The numerical simulation of vortex-induced vibration is mainly divided into: the vortex method and the CFD methods based on different turbulence models.
Conclusion In this paper, through fluent secondary development achieve the numerical simulation about Floating Tunnel fluid-structure interaction analysis and comparison with relevant results, the main conclusions are as follows:1) Floating Tunnel fluid-structure interaction analysis can be achieved by embedding fluent udf language and observed the similar results with the test， these can provide a guideline for the numerical simulation of fluid-structure interaction.2) CFD simulation of floating tunnel vortex-induced vibration can observed the typical phenomena of non-locking and locking region.
[7] XU Feng,OU Jin-ping,XIAO Yi-qing.CFD numerical simulation of flow-induced vibration with different cross-section cylinder[J].
,Numberical simulation of vortex-induced vibration of a circular cylinder with low mass-damping in a turbulent flow[J].Journal of Fluids Engineering,2000,122:694-702

The cross-section area of the CVD tube used for the simulation.
The simulation is represented by the black line in Fig 2.
The simulation was done using a single gas flow without chemical reaction.
Yu et al., “A combined CFD modeling and experimental study of pyrolytic carbon deposition,” Diam.
Grulke, “CFD prediction of carbon nanotube production rate in a CVD reactor,” vol. 387, pp. 307–311, 2004

Research Method CFD numerical simulation is used in this study to analyze the surrounding flow field of the building.
CFD has become a typical tool for analyzing internal flow field in space, air-conditioning and ventilation system.
The commonly used CFD calculation methods at present can be generally divided into three types including: DNS (Direct Numerical Simulation), LES (Large Eddy Simulation) and RANS (Reynolds Averaged Navier-Stokes) [4].
This study applies LES (Large Eddy Simulation) for discussion.
Basic assumptions of CFD numerical simulation in this study Basic Assumptions 1.

This paper summarizes the two methods which are experimental research and numerical simulation to thermal environment of the tunnel.
Through CFD software, the radial temperature distribution of tunnel surrounding rock and the axial temperature distribution of air at winter and summer conditions are obtained which provide basis for further research on thermal environment.
In addition, the solving accuracy of numerical simulation is closely related to the operator, so it has great subjectivity.
The three-dimensional model established on the CFD software is shown in Figure 1.The whole computational domain is 15*500*20m which consist of soil horizon and concrete layer.
Research on Simulation and Evaluation System of Energy Conservation for Tunnel Ventilation System[J].

With the aid of Computational Fluid Dynamics(CFD) software FLUENT and Re-development by visual C++, the important plasma parameters of low current vacuum arc , such as axial current density , ion temperature, electron temperature, mach number, were analyzed.
The simulation results shown that the distribution of plasma parameters is consistent with that of the 2D axis-symmetric model.
Therefore, modeling and simulation of vacuum arc is the important method for the research on vacuum arc.
“MHD model and simulation research of vacuum arc,” Proceedings of the CSEE,vol.25(4), pp.113-118, February 2005
[5] F.Wang.Computional Fluid Dynamics Analysis-Principle and Application of CFD Software.Beijing:Tsinghua University Press, 2004.