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At present, research scholars in wind engineering have done a lot of research work for downburst wind from the aspects of theoretical research, physical modeling and CFD simulation [3].
As an evidence of physical simulation data, for its versatility and economy, CFD simulation has been popularized and applied as an effective method in the field of wind engineering and obtained a certain achievement.
However, the various meteorological factors of downburst in the occurrence and development, such as the micro-physical process and multi-scale nature of atmospheric motion, are not involved in CFD simulation; so the simulated result of downburst wind is always distorted and can not be applied to the design specification.
Fig.1 shows distribution of the first, second, third domain for simulation.
Numerical simulations of impinging jets with application to downbursts.

a*MNorhaslina@uniten.edu.my, bhasril@uniten.edu.my, cIrmawati@uniten.edu.my Keywords: syngas, CFD, pressure, combustion Abstract.
The simulation includes global reaction mechanism, assuming that complete conversion of the fuel to CO2 and H2O and other minor species.
Using species transport model, the steady turbulent flow equation are solved according to the generalized continuity, energy and momentum equation in CFD.
Peretto, “Numerical Simulation of Biomass Derived Syngas Combustion in a Swirl Flame Combustor”, Proceedings of ASME Turbo Expo 2010: Power for Land, Sea and Air, 2010
Shuaib, and A.F.W.A Wan, “CFD Analysis of Temperature Distribution in Can Type Combustor Firing Synthetic Gas”, Applied Mechanics and Materials, Vol. 393 (2013), pp 741-746, 2013.

However, the extrapolation method requiring plenty of data was investigated based on the CFD results for the reason of low cost and short period.
Influence of computational grids convergence and turbulent models were investigated during the process of simulation.
However, the extrapolation method requiring plenty of data was investigated based on the CFD results for the reason of low cost and short period.
The governing equations are . (1) Influence of turbulent models and computational grids convergence were investigated during the process of simulation.
System Simulation Technology & Application(Volume 13), 2011

For the thermal analysis, heat transfer coefficients on the surfaces of a rotor as functions of time are first estimated by CFD simulation, and then imported to a thermal analysis program as the boundary condition.
One way to study the brake squeal is finite element (FE) simulation.
For the thermal analysis, heat transfer coefficients on the surfaces of a rotor as functions of time are first estimated by CFD simulation, and they are imported to a thermal analysis program as the boundary condition, then the temperature distribution of the rotor can be obtained by finite element analysis.
The mesh of the fluid domain, which can be seen in Fig. 3(a), is then imported to ANSYS CFX Pre to define the boundary conditions and other settings essential for a successful CFD simulation.
In the thermal analysis, CFD simulation has shown that vortices will arise in the vented passages of straight-vent rotors, which means less heat carried away and lower heat transfer coefficients.

Optimization Design Research on Manual Piston Pump Liu Nan12,a, Liu Jinli1,b, Fang Baohua1,c, Zhang Hongwang1,d, Shao Weiguang1,e 1 POL Research Institute of General Logistics Department of PLA, Beijing, 102300, China 2 Department of Precision Instrument and Mechanisms, TsingHua University, Beijing, 100084, China aliunanchina@tom.com, bjinlizys@163.com, cfbh@163.com,dylszhw@sohu.com, eshaowg@sina.com Key words: manual piston pump, optimization design, FEM, CFD Abstract: As the research object a manual piston pump is designed lightweight, by using optimization theory and FEM&CFD software.
The CFD zone and mesh is shown in figure3.
The simulation analysis results are as shown in figure 4-8 Fig3 CFD zone and mesh Fig4 Zero time pressure contours Fig5 1/4 time pressure contours Fig6 1/2 time pressure contour Fig7 3/4 time pressure contour Fig8 1 time pressure contour Piston structure design.
Conclusion By the combination of FEM and CFD-based design analysis and optimization design theory, the manual piston pump, pump, piston and end cap structure and the optimization of the flow field design, to make the product more reasonable flow field design, structural strength and stiffness to meet the design requirements.
The FEM and CFD software to improve speed and reliability of the design of product design and shorten the product development cycle, reduce product development costs.

Along with flying development of computer and increasingly ripe of CFD software, the result got from computer simulation can replace the test result from high cost test at a certain extent[2].
Therefore by using CFD software, three models of two-dimensional trajectory corrector projectile in mortar with same canards and different fins are carried out aerodynamic simulation.
Simulation of External Trajectory of Rockets.
Computer Simulation, Vol.6(2003), p. 17
Aerodynamic Simulation Methods of Anti-tank Missile.

Fluent software is one of the world-leading computer fluid dynamics software(computational fluid dynamics,CFD).In this paper, CFD is applied to small melt-blown machine spinning die structure design of flow channel and the Gambit software is used for spinning die of 3D modeling and meshing.
Fig.3 Residual curves 3.3 Fluent Simulation Analysis Curve convergence shows that model can be the solution, and then to internal air velocity simulation model.
Melt-blown polymer based on jet flow field numerical simulation of drawing 3 D model [D].
Melt-blown nonwoven jet flow field numerical simulation and experimental test [D].
Computational fluid dynamics analysis - CFD software principle and application [M].

The aim of this research is to determine the effects of nozzle hole shape on flowcharacteristics of the premix injector by using CFD.
Implosions of cavitation bubbles inside the nozzle holes increase when the turbulence kinetic energy increases and contributes to the further break-up of the spray[8-9].Therefore, the aim of this research is to use CFD simulation to determine the influence of orifice hole shape by analyzing the nozzle flow characteristics of the premix injector.
Boundary conditions for nozzle flow simulation.
This meshing scheme is selected to be used in further simulations.
[9] Tingwen Li, A.G., Sreekanth Pannala, Mehrdad Shahnama, Madhava Syamlal, CFD simulations of circulating fluidized bed risers, part I: Grid study.

Conclusions A CFD computation is speeded up using GPU technology in this paper.
Jahed Djomehri: Hybrid MPI OpenMP Programming of an Overset CFD Solver and Performance Investigations.
American: nVidia, (2012) [5] Zhang B: Parallel Computing Methods for CFD Using a GPU and Implicit Scheme.
[14] Zhang Z S: Large eddy simulation of turbulent flows: Theory and Application.
[18] Li X L: Direct Numerical Simulation of isotropic homogeneous turbulent flow.

The simulation program ANSYS and its use in the simulation of a window.
Simulation program ,,ANSYS,, The simulation program ANSYS is becoming a leader in the field of computer simulations.
The program works with the finite element method (FEM) and finite volume method (FVM) with the support of CFD depending on the module used.
Fig. 3 Surface temperature fields and surface temperature Fig. 4 Geometry and material solutions Wooden window - the transfer of heat through conduction and convection Computer simulation was created in ANSYS with the support of CFD.
ISBN 978-80-254-0301-3 (in Slovak) [3] Palko, M.: CFD simulation with ANSYS, International Scientific Conference Ostrava 2007.