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Investigation of Flow and Heat Transfer Characteristics of Annular Impinging Jet Watchara Musika1,a, Makatar Wae-hayee1,b, Passakorn Vessakosol1,c, Banyat Niyomwas1,d and Chayut Nuntadusit1,e* 1Energy Technology Research Center and Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat yai, Songkhla, Thailand apop_ts@hotmail.com, bwaehahyee@gmail.com, cpassakornv@hotmail.com, dbanyat@engineer.com, echayut@me.psu.ac.th Keywords: Impinging jet, Annular jet, Heat transfer enhancement, CFD Abstract.
The numerical simulation was carried out to visualize the flow behavior.
Numerical Simulation Flow characteristics of the impinging jet were reviewed by using computational fluid dynamics software (ANSYS ver.13.0, Fluent).
Fig. 2 Nusselt number contours on impingement surface (Experimental results, Re=20,000, Tj=27oC) Fig. 3 Distributions of local Nusselt number on the impinged surface passing the centre of impingement region (Experimental results, Re=20,000, Tj=27oC) Fig. 4 (a): Distribution of Y-component velocity on centerline of impingement region above from the surface of 1 mm, and (b), (c): streamlines of jet on Z-X plane passing center of nozzle (CFD results, Re=20,000).

Introduction This design intends to adopt the research methods which is a combination of theoretical derivation, model analysis and software integrated simulation phase.
The analysis of gas-solid coupling of wind turbine blades In this study, the weak coupling partition solution method is adopted, respectively, computational fluid dynamics (CFD) and computational structural mechanics equations (CSD) equation are solved once in each time.
NS equation solving aerodynamic is simulated by CFD, and is simulated by the dynamic response of structures for joint solving calculations .Structure and flow fields exchange information with each other through the intermediate data platform..
Challenges in Simulation of Aerodynamics, Hydrodynamics and Mooring-Line Dynamics of Floating Offshore Wind Turbines[C],Presented at the 21st International Offshore and Polar Engineering Conference, 19-24 June 2011, Maui, Hawaii
Dynamic overset CFD simulations of wind turbine aerodynamic[J], Renewable Energy 37 (2012) :285-298

Initial studies were performed using CFD (ANSYS / Fluid Dynamics).
Finally, the 3-D stall barrier was mounted on a complete model rotor blade and investigated by means of a numerical flow simulation.
Figure 8: Velocity distribution in the cross-section of the stall barrier with flow channel The CFD analysis has shown that the following design parameters have a significant effect on the efficiency of a stall barrier with suction (Fig. 8): • Height of the channel compared to the maximum profile thickness • The "dead water area" in the intake depends on the inlet inclination relative to the free flow of the profile shape and the inner channel form (height, etc
The future flow simulations should also be calculated in transient mode in order to obtain a more accurate result.
References [1] Wittig, S.: Numerical flow simulation of a horizontal axis wind turbine (HAWT) rotor to investigate the potential of improving the operating performance under use of different aerodynamic modifications, cp.max Rotortechnik GmbH & Co.

Turbulence is one of the key CFD models applied in numerical compartment fire modelling.
However, there exists three different main forms of turbulent simulations that calculate and/or model large and small eddies – Direct Numerical Simulation (DNS), Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES).
Turbulence models in CFD.
Modelling and Simulation in Engineering, Article ID 781252, 16 pages
Toward thelarge-eddy simulation of compressible turbulent flows.

Experimental and simulation procedure Figure 1 shows a schematic diagram of a reactor for the high-temperature gas source method.
A commercial software CFD-ACE+ and add-on software CVDSim SiC Edition were used in simulation analyses of growth rates, depending on the seed rotation speed and temperature distributions in the reactor [4,5].
[4] Information on https://www.esi-group.com/software-services/virtual-environment/cfd-multiphy sics/ ace-suite/cfd-ace/

Based on the heat and mass transfer theory and characteristics of the CFD software, a three-dimensional numerical simulation platform had been developed to study the thermal performance in a natural draft wet cooling tower.
Therefore, a three-dimensional numerical simulation platform was developed to study the heat exchange and flow situation of cooling tower.
It uses three dimensional numerical simulation platform is used to simulate the two group working simulations.
The computing values of the simulation platform are found to be in good agreement with the design data.
The simulation platform could provide forceful support to the research of cooling tower.

A thorough assessment of performance was made possible by using rapid-prototype models and numerical simulation and the intake port steady flow.
In this paper, use of AVL Fire, unite the modern method of numerical simulation and the intake port steady flow, in a new diesel intake port example, carry out forecast design.
Flow coefficient is a very important parameter, because of its veracity , the design basis of the no swirl vertical intake port, three-dimensional model, CFD model, mathematics model and the project of the intake port steady flow, the simulate results are fund very closed with experimental results. we can prove the feasibility of the forecast design of diesel engine intake port based on numerical simulation.
Further analysis of other flow parameters also be got, and provide a reliable basis for simulation.
Figure 3: Directed port CFD-model Figure 4: Measured v Computed Flow coefficient The DoE results were analyzed using multiple regression to determine the most significant parameters and interactions.

Gasoline numerical simulation of the work of research[J].
The engine intake valve at the gas flow simulation[J].
CFD technology in internal combustion engines Design[J].
Numerical simulation of cylinder internal combustion engines Research and Development[J].
Cylinder direct injection gasoline engine three-dimensional numerical simulation of working process[J].

Simulation method Numerical simulation method includes the following types: direct numerical simulation, Reynolds averaging method and large eddy simulation[1].
The direct numerical simulation and large eddy simulation can obtain more information than Reynolds averaging method. 2.
Direct numerical simulation and experiment This paper uses a twelve stage finite difference method for the calculation of direct numerical simulation.
Numerical simulation results and experimental analysis As an example Reynolds number equal to 2200 get a direct numerical simulation and experimental analysis, the simulation results and experimental results are compared 3.1.
[4].Li Xinliang, Ma Yanwen， Fu Dexun, CFD J. 2000， Vol.8， No.4， 536-543 [5].

azhouhua@cjwsjy.com.cn, bdingjianxin@cjwsjy.com.cn, czhangzhicheng@powerchina.cn, dwangzhanjun@cjwsjy.com.cn *Corresponding author Keywords: water temperature, reservoir, calculation, CFD, solar shortwave radiation Abstract.
In the numerical simulation of turbulence, the Reynolds averaging method solves the time-averaged Reynolds equation, avoiding the problem of large amount of calculation.
The Finite Volume Method is the most widely used method in CFD numerical simulation.
A general model that uses to predict the water temperature distribution of the reservoir is built by using customized CFD software FLUENT.
[4] Wuhan University, 2012.Research on the 3D Integrated Simulation Analysis of the Whole Process of Dam Construction and Impoundment[R].