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The model of exhaust silencers discussed in this article is fluid-solid interaction model and this paper uses the CFD software for numerical simulation of the model.
Mesh generation technology is an important part of computational fluid dynamics, and the accuracy of CFD calculations relies heavily on the quality of the generated mesh.
We can see that mesh generation technique is one of the key technologies in using CFD as effective tools in aerodynamics works.
This proves that numerical simulation methods can be used in silencer structure simulation and optimization.
CFD software principle and application ( Tsinghua university press, Beijing 2004).

We used CFD numerical method to investigate the influence of width, height, outlet size and the angle of photovoltaic plate on the performance of PV channel based on the summer typical meteorological parameter.
Wang Hanqing summarized three common simulation methods of the double curtain wall (meshed network simulation, computational fluid dynamics method and building energy simulation).He thought before the design of double curtain wall, simulation analysis should be carried on [1].
This paper presents influence of width, height, outlet size and the angle of photovoltaic plate on the performance of PV channel based on the Shanghai summer typical meteorological parameter by CFD method.
In the simulation, convection heat exchange has adopted as a boundary condition of external surface.
Reference [1] Hanqing Wang, Yu Chen, Guangxiao Kou and Zhiyong Wang, Progress on Study of Double-Skin Facade Simulation Building Energy & Environment, 2008,Vol.27 No.5 19-22 (In Chinese) [2] Hanqing Wang, Fengfeng Wang, Guangxiao Kou and Zhiyong Wang, Simulation Study on Thermal Performance of Mechanically Assisted Ventilated Double Skin Façade Building Energy & Environment, 2011,Vol.31 No.3 75-77 (In Chinese) [3] Guixian Zhang, Lidong Chen and Dong Ding, Heat transfer analysis for double skin façade of building based on CFD fluid model Construction & Design For Project 2003,Vol.9 4-7 (In Chinese)

CFD Simulation and Mathematical Modeling In order to provide designers with concepts for flow-based integration of cleanroom layout by relating CFD simulation results to fundamental design parameters, we averaged out the several dimensions of the cleanroom from our previous simulations, and defined typical dimensions of the cleanrooms used in semiconductor or FPD fabrication industries.
Thus to find out the location and angle of inclination, we performed CFD simulations of cleanroom at various width and height under fixed inlet velocity of sm/5.0 .
These CFD simulation results may be shared with cleanroom designers for further steps of cleanroom designs.
In addition predicted results by both, the mathematical model and the CFD simulation, were reasonable and close to the observed cleanroom flow.
Consequently, the predicted angle/location of maximum flow inclination by our model agreed well with the CFD simulation results and with the expected trends.

According to the CFD numerical simulation of hydraulic turbine internal flow and simulation calculation of vortex and cavitation of draft tube, and in the three dimensional modeling and analysis of the draft tube elbow is found that commonly modeling methods are tedious process, there is more deviations, not conducive to modify the part size and flow over a smooth.
Introduction The internal flow in draft tube of CFD numerical simulation, the degree of smoothing of the flow surface can not only greatly reduce the resistance of fluid motion, but also help to improve the accuracy of calculation, the more real and close to reality, to improve the simulation authenticity and accuracy, improve the calculation value[1].
With the rapid development of computational fluid dynamics (CFD), the research of pressure fluctuation on the draft tube has been more and more deeply in the domestic and foreign; the numerical simulation method is also increasing.
The projective modeling overcome the problems of the two traditional methods, and improve the precision of CFD numerical simulation and obtain higher accuracy requirements
(2) When CFD simulation, the modeling method proposed in this paper without significantly vortex with eccentric.

This work used ANSYS software to calculate the aerodynamics parameters generated by main rotor with help of CFD tools using the remarked ideal of simulation in [2-7].
CFD b.
CFD Theory a.
Natural Frequency Fig. 7 Modal method Summary A steady CFD-CSD coupled simulation was used to analyze the strength of the designed main rotor.
For the future work, the durable designed main rotor was analyzed with a fully CFD-CSD coupled simulation.

This study presents consisted in to simulate through computational fluid dynamics (CFD) package the operation of the Lapple cyclone.
If numerical simulations are conducted the immediate need for validation arises if the results are to be of practical use [3].
CFD is often perceived as a virtual fluids laboratory where experiments can be performed on the computer, but numerical simullation actually holds many advantages over its traditional counterpart, including: speed, cost, completeness of information, and simulation of all operating conditions.
The Yield of Pressure showed in the Fig.6, presents layer defined of the pressure in the cyclone, with maximum in the wall and minimum in the axis. 5 - Conclusions The relevant variables in the study of cyclones through the simulations using the techniques of Computational Fluid Dynamics (CFD) are compared to the experimental data of the literature [8] showing a good agreement.
The CFD techniques are a reliable and relatively inexpensive method of examining the effects of design changes on sampler performance of cyclone.

The different AOA (Angles of attack) 0̊, 6̊ and 10̊ are considered with Re = 3.6×106 for the supersonic flow simulations.
L A Schiavetta (2003) [10], carried out CFD simulation for transonic flow over the 65 degree sharp leading edge delta wing for M∞ = 0.85 and Re = 6×106 at 18.5 and 23 degrees.
The Reynolds number considered for the simulations was Re=3.6x106.
Fritz: Analysis of Transonic Flow on a Slender Delta Wing Using CFD, AIAA Paper 2006-3171. (2003) [11] N.
Allen: DELTA WING AERODYNAMICS – Requirements from CFD & experiments, Integrating CFD and Experiments, Glasgow, UK. (2003) [14] V.

Underfloor Air Cavity Created from Special Shaped Units and Different Intensity of Outdoor Wind Flow Tomáš Renčko1,a* and Anna Sedláková1,b 1Technical University of Košice, Vysokoškolská 4, 042 00 Košice, Slovak Republic atomas.rencko@tuke.sk, banna.sedlakova@tuke.sk Keywords: Underfloor Ventilation, Special Shaped Unit, CFD Simulation, Wind Flow Abstract.
To assessment the airflow in the air cavity the recently often used CFD simulations can be employed.
Conclusion The paper aims to highlight the possibilities of CFD computer simulation programs to assess airflow in underfloor cavities.
Šikula: CFD simulation of ventilated air cavity.
Sedláková: CFD Model of an Underfloor Air Cavity Created from Special Fittings and its Verification Using a Laboratory Model.

Influence Analysis of Blade Fracture on Hydrodynamic Performance of Ducted Propellers Based on CFD Li Jian OU1, a, De Yu LI1, b, Wei Zhang1, c 1School of Civil Engineering and Transportation, South China University of Tech., China; aljou@scut.edu.cn, bdeyu@scut.edu.cn, c241222462@qq.com Keywords: CFD, Ducted Propeller, Hydrodynamic Performance Abstract: The numerical model of the unsteady flow field of ducted propellers is based on CFD (computational fluid dynamics).
Introduction CFD (computational fluid dynamics) is widely applied in the numerical simulation of flow field.
Because of its adaptability and accuracy, CFD gradually becomes an important tool in hydrodynamic research.
Compared with experiment research, numerical simulation has advantages of low-cost and short-period, and can obtain complete data and simulate the measurement of various data in practical operation process.
Hydrodynamic Performance Prediction of Some Propeller Based on CFD[J].

Based on the analysis, the simulation result is qualitatively discussed referring to the factual conditions of the engine for validating the feasibility of analysis method.
The appropriate relationships of these stresses can be built by turbulent models, such as the standard model, which is widely used in engineering, is adopted in this paper; this model is a semi-empirical model of the two equations of the turbulent kinetic energy and the diffusion rate , the control equations are as follows: （2） where, represents the fluid’s density, represents the fluid’s dynamical viscosity coefficient, represents the turbulent viscosity coefficient, represents the turbulent kinetic energy created by the average velocity grads. 3 Interpolation method of CFD-CSD Because CSD and CFD mesh disaccord, CSD mesh is sparseness then CFD mesh, so you must insert the CSD displacement of mesh node to CFD mesh node to make the data exchange.
Mathematical Simulation.
The MFX-ANSYS/CFX coupling platform is developed by the ANSYS Corporation to realize the coupling calculation between CFD and CSD.
Based on the analysis, the simulation result is qualitatively discussed referring to the factual conditions of the engine for validating the feasibility of analysis method.