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Simulations were performed with a radius ratio = 0.714.
To evaluate the heat exchange inside finned air-gap, computational fluid dynamics (CFD) is a powerful method to predict the complex flow problems, especially our case.
Grid Generation The mesh was created using ICEM CFD.
Before starting the simulation of the configuration of our study, several grids were tested in order to generate a good mesh.
Hudon, CFD analysis of turbulent convective heat transfer in a hydro-generator rotor-stator system, Applied Thermal Engineering. 130 (2018) 17–28

Simulation of a wall jet flow over a rectangular cavity Fatima Madi Arous1, a, Amina Mataoui1, b, Abdellali Terfous2, c and Abdellah Guenaim2, d 1 LMFTA, Faculty of Physics, University of Sciences and the Technology Houari Boumediene; 16111, Bab Ezzouar, Algiers-Algeria. 2 LGCO, INSA; 24 bd. de la Victoire, 67084 Strasbourg, France.
The simulation of a turbulent wall jet flow over a rectangular cavity is realised by the low Re stress-omega model.
FLUENT 6.3 CFD code was used as the solver.
(4) CFD computations with the Reynolds stress transport equations maintain the production term in its exact form [12]
U=Ui ; V=0 ; k=ki  p=k= ω=0 p=0 p=0 Wall conditions Computational domain G F E D H B C C ' B' A Fig. 2: Boundary Conditions Results and Discussion Characterization of the incoming flow In order to verify the similarity of the wall jet incoming flow, we began this study by a simulation of a wall jet.

Wind engineering research is mainly based on wind tunnel test, numerical simulation and field measured three ways.
Numerical simulation can simulate real wind environment, the structures and buildings is actual size calculation model, compared with wind tunnel test, he avoided the scale and the actual wind environment.
And scholars believe that the wind speed based on the monte carlo method, time history curves for wind vibration analysis has limitations, thus put forward is based on the interference and random simulation method based on structural response.
With the rapid development of computational fluid dynamics (CFD), numerical simulation technology to get more extensive application.
But due to the civil engineering structure is a blunt body shape, wound flow with separation, attached again, vortex shedding and other complex flow phenomenon, and the wind field simulation of Gao Lei are provided for the technology is not mature, so the CFD numerical simulation is not confined to form complex structures.

Fax: +86-10- 61772031 E-mail address: cqdong1@163.com Keywords: numerical simulation, grate combustion, dust removal.
According to simulation and practical experience, it is indicated that the mixing plays a key-role in the combustion of the furnance [5].
A commecial code FLUENT is used as the CFD solver [7].
The commercial code FLUENT has been employed to perform the simulation of gas flow in boiler.
Simulation has been performed to confirm the effectiveness of the device and the most favorable air ratio.

Using ANSYS－FLOTRAN CFD program, the temperature field and the stream field in sensing element of three wire structure and two wire structure under the effect of the different tilt state, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving.
Finite element method ANSYS－FLOTRAN CFD is an advanced tool used to analyze the two and three dimensional flowing fields[2].
“Practical Engineering Numerical Simulation and Practice in ANSYS,” Northwest Polytechnical University of Technology Press, Xian, pp. 221, 1999.

In this paper, we get the features of wind field of special topography by studying a two-dimensional model of a typical hillside, and using CFD numerical simulation.
Considering the full development of the turbulence and the impact of the size of the wind field simulation, we use 20 × 10Djet computational domain, the initial injection inlet position is defined as the distance to the ground H / D = 4, the computational domain of geometric proportions with Hangan [6] The computational domain is consistent .
[2] Proctor Fred H.Numerical Simulations of an Isolated Microburst.Part I:Dynamics and Structure[J].Journal of the Atmospheric Sciences.1988,45(21):3137-3160
[5] Jongdae Kim,Horia Hangan.Numerical simulations of impinging jets with application to downdrafts[J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95(4):279- 298
[6] Mason M.Physical simulation of thunderstorm downbursts[D].Masters thesis,Lubbock(TX, USA):Texas Tech University,2003.

The Three-dimensional Unsteady Numerical Analysis of the Internal Flow Field of the New Control Valve Qu Dongyuea, Xu Jialeib , HuangYangyangc and Xie Xiaozengd College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China aqudongyue@hrbeu.edu.cn, bxujialei1991@126.com,chuangyangyang1314@yeah.net dxiexiaozeng@hrbeu.edu.cn Keywords: control valve; unsteady flow; numerical simulation; pressure fluctuation Abstract.
This paper take the new valve as the research object, by computational fluid dynamics (CFD) software, the numerical simulation of the internal steam steady state flow field of valve normal work a typical opening in the process of opening is made, and obtain the internal flow field visualization distribution and flow characteristics of control valve.
The current domestic study of control valve stay in level of conventional engineering imitation and prototype performance, few numerical simulation of unsteady flow in the valve, and abroad for the vibration of the control valve adopted a negative test method to solve, not from the viewpoint of fluid dynamics to study the unstable flow control valve.
Choice the total pressure and static export as its import and export boundary conditions in the process of numerical simulation.
So in the next will mainly proceed transient simulation of 10% opening under pressure ratio is 0.585.

Numerical Simulation of a Low Reynolds Number Airfoil Yufu Wang1,a, Guoquan Tao1,b, Zehai Wang1,c and Zhe Wu1,d 1 School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China a 373216370@qq.com, b justin-psp@163.com, cwzh881230@163.com, d wuzhe@buaa.edu.cn Keywords: Low Reynolds number, Airfoil, Aerodynamic characteristics, Numerical simulation.
In this paper, the complex flow around a low Reynolds number was simulated by CFD.
Numerical Simulation Method Governing equation.
Table 1 Lift and drag coefficient at different angles of attack Angle of attack[°] Lift coefficient Drag coefficient 0 0.8290 0.0202 2 1.0387 0.0222 4 1.2347 0.0253 6 1.4102 0.0298 8 1.5554 0.0365 10 1.6548 0.0466 12 1.6784 0.0620 14 1.5806 0.0852 16 1.3261 0.1230 Fig. 3 Relationship between lift coefficient and drag coefficient and angle of attack Summary Aerodynamic characteristics of a low Reynolds number airfoil (S1223) are studied through numerical simulation, which has guiding significance for selecting high altitude propeller airfoil.

The CFD software FLUENT was used as the foundation to develop the numerical wave flume, in which the governing equations are the Reynolds-averaged Navier-Stokes (RANS) equations and the standard k~ε turbulence model.
In the paper, CFD software FLUENT is used as the foundation to develop the numerical wave flume.
Numerical simulation of progressive wave and standing wave was carried out to cheek if the module works well.
Numerical Simulation of Wave Impact on the Slab.

The new design was simulated in CFD for tolerating stresses.
Fig. 5; Deformation simulation Fig.6; Shear stress simulation Prediction of new design In another paper a variable intake Cam profile was tested and found to be promising for SI engines with single overhead as it has reduced CO and HC emissions at high speed also the brake torque, volumetric efficiency were improved through all engine speeds. [12] Fig.7; Expected engine speed- torque curve for new Cam design The new design giving Cams various heights that can be controlled hydraulically based on the speed and load of the engine.
The design has been simulated by CFD for the stresses and tear and found to be withstanding the rotations and modification.