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Water tank experiment and Particle Image Velocimetry (PIV) technology were used to gain typical wind flow field and validate the simulation results.
The application of computational fluid dynamics (CFD) in wind engineering research has significantly increased in the last two decades[2,3].
CFD performs the concepts needed to solve the governing equations for fluid mechanics using numerical methods and allows for easier control of each parameter, So CFD could be a powerful tool for parametric analysis of the factors influencing flow and dispersion processes and is often used jointly with physical experimentation, such as wind tunnels, water tank or field studies.
Because CFD techniques rely on various assumptions and results are usually associated with high uncertainties, so there is a strong need for validation and assessment of the data obtained by numerical simulation.
Physical simulation of atmosphere dispersion.

Field measurements [2, 3], wind tunnel experiments [4, 5] and Computational Fluid Dynamics (CFD) simulations [6-8] have all been utilized for studying airflow and pollutant dispersion in street canyons.
Due to the turbulent features of airflow in atmospheric boundary layers, the selection of turbulence models in CFD simulations is crucial for reliable predictions of pollutant distributions in street canyons.
The objective of this study is to investigate the performance of various turbulence models in the CFD simulation of pollutant dispersion within an isolated street canyon.
Numerical simulations Physical model.
Computational domain and isolated street canyon configuration CFD model.

Simulation Conditions The relevant parameters in the simulation process are shown in Tab.1 and Tab.2.
Using CFD method, the carbon black which flowing in the bent pipe from vertical upwards to horizontal is simulated, some useful conclusions are obtained, and they coincide with the actual operation situation.
It indicates that the simulation analysis using this method is feasible.
Other type of bent pipe (such as the bent pipe from horizontal upwards to vertical, the bent pipe from horizontal to horizontal, the bent pipe from vertical upwards to horizontal, the bent pipe from horizontal downwards to vertical etc.) can also use the CFD method to have a simulation and analysis
[3]Zhang Shishuai: Computational fluid dynamics and its application: the principle and application of CFD software (Huazhong University of Science and Technology press, Wuhan2011)

., Yin He Li North Road No.1, Bei Cang Town, Bei Chen District, Tianjin City, China adhj1230_171@126.com, bchaixingteng@tcdri.cn, cniewenhai@tcdri.cn Keywords: Numerical simulation, CFD (Computational Fluid Dynamics), flow field, vertical roller mill, separator, cement.
In order to reduce the larger pressure resistance (pressure difference between inlet and outlet) of a vertical roller mill, the flow field in the vertical roller mill is numerically simulated by CFD technology.
Because grinding process cannot be simulated by CFD program, so the zone between wind ring and the outer brim of mill disk is chosen as TRM53.4 feed boundary.
Results and discussion Table3 Data comparison of simulation with test on the spot Boundary Velocity[m/s] Pressure[Pa] Pressure resistance[Pa] test simulation test simulation test simulation Outlet 18.32 15.75 -10170 -10170 Hot gas inlet1 21.83 20.71 -570 -706.81 9600 9463.19 Hot gas inlet1 18.01 19.13 -655 -444.22 9515 9725.78 Fig.3 Outlet velocity changing tendency of simulation and test on the spot The simulation data see Table3.
It is impossible to avoid the simulation error, however the superiority of CFD simulation, tendency forecast, can be utilized.

Tel: +86 431 85095271 Keywords: Free Piston Engine, Loop-Scavenging, Scavenging Efficiency, CFD Abstract.
CFD Modeling Model Configuration.
All CFD models require initial and boundary conditions.
Blair, Design and Simulation of Two-stroke Engines.
[6] J.Fredriksson, I.Denbratt, “Simulation of a Two-Stroke Free Piston Engine”, SAE paper, 2004-01-1871

A computational fluid dynamics (CFD) model of a 600 MW opposed swirling coal-fired utility boiler has been established.
A computational fluid dynamics (CFD) program was used to perform the simulations.
NOx simulation mainly considerate the formation of thermal NO and fuel NO.
The simulations with three cases were carried out.
The simulations were performed under 600 MW load.

This factor is not considered in the simulation.
While the CFD simulations is performed for a steady state scenario only for a given time, because the time scale for the forced convective heat transfer processes within the canyon is much shorter than that for the surface temperature change process.
(2) For the given time of day, the surface temperatures of walls and road calculated through the urban canyon model are provided to the CFD simulation.
And then the CFD simulation is performed without considering of buoyancy effect to obtain a coarse temperature distribution and wind field in the street canyon
(3) CFD simulation is carried out considering the buoyancy effect on the basis of the results obtained by the 2nd step.

With simulations, the suction process of dusts was investigated using commercial CFD program Fluent 6.3.
The equations described above were solved numerically by using finite volume based Fluent CFD code.
With simulations, the airflow characteristics and dusts removal efficiency of a pickup head were evaluated for different pressure drops.
Xu: Journal of System simulation.
Zeng: Journal of System simulation.

The CFD method allows for limited research opportunities, as it relates to energy-saving devices.
Numerical Prediction of Energy Saving Effect of Rudder Bulb Based on CFD Technology For the purpose of maximum efficiency of propeller, the paper designs 13 different rudder bulbs.
The result of viscous CFD prediction shows that the propeller thrust has increased by 1.3% and the total resistance of ship has decreased by 0.74%.
CFD simulation of propeller and rudder performance when using additional thrust fins.
Mesh partition methods for numerical simulation of the flow fields of full form ships.

Magnetic field simulation and flow field simulation are done through ANSYS and computational fluid dynamics (CFD) software.
Unthreaded hole is experimented on the basis of simulation.
Magnetic field simulation and flow field simulation are done through ANSYS and computational fluid dynamics (CFD) software.
Simulation of swirling airflow compounded with magnetic-field finishing process Simulation of magnetic field.
Zhang: The Principle and Application of CFD Software（Tsinghua University Press, China 2004).