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Introduction Computational Fluid Dynamics (CFD) is an engineering tool that assists experimentation.
Its scope is not limited to fluid dynamics; CFD could be applied to any process which involves transport phenomena with it.
In CFD a problem is simulated in software and the transport equations associated with the problem is mathematically solved with computer assistance.
The turbulent dynamic viscosity is computed from μt = ρν ∱ν1 (6) K- Model The standard K- model was considered for this simulation.
Bartosiewicz, Zine Aidoun, “CFD-Experiments Integration in the Evaluation of Six Turbulence Models for Supersonic Ejectors Modeling” CETC-Varennes, Natural Ressources Canada, ybartosi@RNCan.gc.ca [8]C.Mohanraj, Dr.P.K.Srividhya, “CFD Simulation of 20 kW Downdraft Gasifier” International Journal of Current Engineering and Technology ISSN 2277 - 4106, Vol.3, No.1 (March 2013) [9] K.M.

Parametric Numerical Simulation of Mean Wind Loading on Stadium Cantilevered Roofs Ying SUN1,a, Bo XIANG1,b, Bin LIN2,c and Yue WU1,d 1School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China 2Beijing Construction Procuring & Contracting Trade Center, Beijing 100083, China asunnyhit@hit.edu.cn, bshunzihit@gmail.com, clbhit@163.com, dwuyue_2000@163.com Keywords: numerical simulation; cantilevered roofs; mean wind pressure; Computational Fluid Dynamics Abstract.
Studies on the characteristics of the mean wind load acting on the cantilevered roofs are carried out systematically by CFD (Computational Fluid Dynamics) numerical simulation.
Numerical simulation method RANS simulations are carried out using a commercial CFD code, FLUENT.
During simulation it is set that the numeral calculation is convergent when the residuals is less than as well as the mean pressure coefficients is steady.
In order to compare the numerical simulation results to that of wind tunnel test, the models are defined with the same size with wind tunnel model which can be refered to [4].

Numerical Calculation and Theory of Friction Film The CFD Numerical Theory.
CFD is the integral or partial differential equations was instead by the discrete algebraic.
Simulation of fluid film with Fluent software, can simulate the, relationship between some dynamic characteristics of fluid film and some related parameters.
[2] Houlin Liu, Liang Dong: The progress of mesh generation method in Fluid Mechanics CFD, Fluid Mechanics,2010,38(4).p.32-37 [3] Baoyan Li.
Fluid Mechanical, 38 (2010), p. 23-27 [7] Zhaogao Luan, Khonsari M.M: Numerical Simulations of the Flow Field around the Rings of Mechanical Seals.

The predicted Mach number distributions fit with the CFD results very well, that proves the efficiency of this strategy.
Let are sets of sample data generated by numercial simulation or experiments.
Fig. 5 shows the corresponding Mach number distributions calculated by the CFD code at both moments.
From comparison of these two figures, the predicted results fit with the CFD results very well.
Mistree, Kriging Models for Global Approximation in Simulation-Based Multidisciplinary Design Optimization, AIAA Journal. 39 (2001) 2233-2241

CFD simulation has been carried out at the early stage of the investigation (for NACA 0044 and NACA 0063), and a new airfoil profile had been created (0044-63) by modified the chord length and the location of maximum thickness of the airfoil by using the modified NACA Four-Digit Series.
This paper present the aerodynamics study for three selected airfoil profiles (NACA0044, NACA0063 and 0044-63) which had been developed by CATIA and the simulations performed in STAR-CCM.
This range has been chosen reflected from the CFD result which has been simulated at the earlier stage of this study.
Wind Tunnel Specification Test cross section area 500 mm x 500 mm Overall length 8050 mm Overall height 1900 mm Maximum speed 50 m/s Number of blades 9 pieces Maximum power available 25 HP Fig. 1 Final model for testing So based on this constraint, the minimum value of wind speed is set to be 25 m/s and the comparison with the CFD simulation result will be made by using Reynolds number similarities.
This also proved that the CFD analysis which has been conducted at earlier stage of this study is acceptable.

Therefore, technical analysis and model simplification are necessary when we use CFD to do the analysis.
CFD simulation analysis Current research of Natural ventilation focuses on the design of natural ventilation with traditional experiences, most of which are qualitative design, lack of quantitative analysis results of energy-saving.
Currently, there is wind tunnel simulation and CFD used in quantitative analysis, with the development of computer technology, CFD has been widely used for its inexpensive and convenient way.
This simulation is based on the ground floor of Wenyuan Building, in the middle is the corridor, on both sides of which are symmetric classrooms.
Through above simulation experiment, we have a quantitative visual simulation of air velocity field and air-age distributions in different high levels as well as have a comprehensive and more intuitive understanding of principle of natural ventilation of modified Wenyuan Building.

ANAND3, c 1, 3 Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli, India 2, Department of Automobile Engineering, PSG College of Technology, Coimbatore, India avp5830@gmail.com,bapkarthipsg@gmail.com, canandachu@nitt.edu Keywords: PEM Fuel Cell, flow channel, CFD modelling, H2, H2O ABSTRACT As fossil fuels are becoming less reliable and more costly, the Proton Exchange Membrane Fuel Cell (PEMFC) is emerging as the primary candidate to replace the stationary and transport applications.
In this study numerical simulation on PEMFC is done by commercially available Computational Fluid Dynamics (CFD) software.
MODEL DEVELOPMENT In this paper a three-dimensional model of a serpentine flow channel design with channel to rib configurations on (L:C) - 2 x 2 has been developed by using commercially available Computational Fluid Dynamics (CFD) software to analyse the electrochemistry and transport phenomena of the reactants and products inside the fuel cell.
In order to solve the myriad of equations associated with a fuel cell simulation, the entire cell is divided into a finite number of discreet volume elements or computational cells.
CFD models for analysis and design of PEM Fuel Cells, Nova Science publishers, Inc.; 2008

In order to study the specialties of wave slamming on open-piled structures, a two-dimensional regular wave tank was established based on commercial CFD software FLUENT.
In the following sections, the two-dimensional regular wave tank was established based on commercial CFD software FLUENT.
Table 1 shows the comparison results of simulation and the experiment.
Numerical Simulation of Random Wave Slamming on Structures in the Splash Zone.
Prediction of Wave-in-deck Forces on Fixed Jacket-type Structures Based on CFD Calculations.

Software ANSYS [1], which uses CFD method, is used for the modelling.
For the modelling, software ANSYS [1], which uses CFD method for the analysis, is used.
Calculation process The parametric study – an analysis by CFD method was performed for velocities of 4 to 19 m/s, always with the step of 3 m/s.
Results After the simulations of the course of air flow, six sets of air flow shapes in the air cavity were obtained.
Turbulence modeling for CFD. 3rd ed.

It indicates that the DEM method may be used as a powerful tool for the simulation of the gas-solid flow.
With the development of the computer technology, the computational fluid dynamics (CFD) has developed rapidly, which provide low-cost and high efficient design method [5-7].
Generally speaking, there are two methods for gas-solid two-phase flow simulation, namely Lagrangian and Eulerian approaches.
The CFD-DEM method is used to simulate the hydrodynamic character of gas-solid flow in fluidized bed.
It is shown that with the flexibility and accuracy, the DEM-CFD is a valuable direction for the dense gas-solid flow simulation Acknowledgements This work was financially supported by the National Natural Science Foundation of China (51006106) and the National High Technology Research and Development of China 863 Program (2006AA05A103).