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One is a simple dispersion model based on Gaussian formula; the other is complicated computational fluid dynamics (CFD) model which can distinguish building structure.
Despite the complex urban environment can be characterized by CFD model more reasonable, but it takes a lot of time for numerical computation, and can not meet the emergency needs of the actual incident.
The first tracer test data was used to study the applicability of CALPUFF model in this study, the simulation domain was 1.8km×1.8km (i.e.
But significant difference found between the simulations and observations at the ground level (not shown).
Time series of SF6 concentration from the observations and the simulations is shown in Fig 3.

This document established a three-dimensional laminar mathematical and physical model which describes heat transfer, mass transfer coupling process in wet thermal recovery unit for air-conditioning systerms, based on Computational Fluid Dynamics (CFD) simulations.
This paper will adopt CFD method to simulate, approach temperature, pressure and concentration distribution of heat recovery unit, and analyse the simulation results so as to provide guidance for the optimization of wet heat recovery unit for air-conditioning systerm.
First of all, the simulation area and reference frame must be determined.
As shown in Fig.2, the area of central symmetric plane between fresh air and exhaust air channel is selected as the simulation area.
Simulation Results and Analysis As shown in Fig.3, the fresh air temperature gradually decreases with the flow direction and from channel center to the heat transfer plate surface. the air temperature of heat transfer plate surface is far lower than that of channel center.

asrinivasle06@gmail.com, bsrinivasapotty@yahoo.co.in Keywords: Fighter Aircraft, Wing, CFD, transonic.
For this the fighter aircraft wing performance for various flow conditions and sweep angles are obtained based on the empirical, semi-empirical and CFD simulation results.
To understand much more in transonic flow over the wing body this paper deals completely CFD analysis.
Methodology: The analysis used CFD to decide the flow field and aerodynamic coefficients on a fighter aircraft wing configuration.

., Tianjin, 300457, China a Corresponding author, Email: zsha@tust.edu.cn Keywords: Multi-scale; Solid-liquid two-phase flow; Vortex; CFD.
Computational fluid dynamics (CFD) method was used to study the inhomogeneous distribution and multi-scale features of the solid particles in DTB crystallizer.
These years, as a research approach, CFD has been widely used in simulation industrial crystallization process [6,7].
In order to simplify the simulation, only the main forces shape resistance and drag force are taken into consideration.
Geometry and meshes of DTB crystallizer in simulation In the simulation process, water (density 997 kg/m3) worked as continuous phase.

By the CFD(computational fluid dynamics) software, the diffusion flow phenomenon is studied.
This article creatively combines the microspheres blood flow with the CFD.
Numerical Simulation Method The S-A Turbulent Flow Model .
Before the multiphase unsteady simulation, a steady flow field without nanometer microspheres has been calculated.
The list of parameters of the simulation case is showed in table.1.

The unsteady wake effect of upstream wind turbine on the aerodynamic performance of downstream wind turbine is investigated using CFD simulations in this paper with two two-dimensional models of H-type wind turbine of three same blades.
It is difficult to generate grids and need to cost more time to generate good quality grids using traditional CFD software.
（a）t=0T （b）t=1/6T （c）t=2/6T （d）t=3/6T （e）t=4/6T （f）t=5/6T Fig.5 The velocity contours with different time in one circle (S=15D) Conclusions The unsteady viscous flow field of two two-dimensional models of H-type wind turbine with different distances of three same blades is investigated using CFD simulations in this paper.
Simulations of the Fluid Flow around a rotating Vertical Axis Wind Turbine [J].
Numerical simulation of The Aerodynamic Performance of H Type Wind Turbine [J].

Based on the numerical simulation experience of CFD for high temperature and high velocity compressible flow [6], and combined with the temperature comparison and modification method [7,8], the convection heat transfer of ribbed plate is operated.
The adiabatic wall temperature and real wall temperature are and , and the adiabatic wall temperature is obtained by CFD.
Numerical simulation results of CFD Adiabatic flow field of jet-flow is simulated by CFD.
The program of thermal analysis for ribbed plate is compiled and the dates from CFD are utilized.
Though analyzed, the dates include jet-flow velocity, Mach number, pressure, temperature and enthalpy, some of the results from CFD are showed in Fig.2 and Fig.3.

CFD is used to predict the aerodynamic performance of VAWT [3,5].
Variable use in this simulation is chord length (20cm, 25cm, 30cm), angle of attack (0-12 degree), and wind velocity (1-7 m/s), simulation is running in full factorial sequence with 273 running simulation.
The result of the simulations represent in sliding ratio value in table 1 to table 3.
Simulation Results CFD simulations performed to predict the sliding value ratio to be used as a performance evaluator blade configuration.
CFD analysis on wind turbine Savonius Hybrid-Darrius, proceeding SNTMUT 2014, ISBN: 978-602-70012-0-6

Stage and steady simulations are carried out in different condition.
The pressure of inlet is calculated by the CFD code.
After optimization, the impeller pressure ratio fits the CFD results perfectly (shown in Fig. 3a ).
The off-design performance result outputted by CCPP is compared with CFD results.
After optimization, the mean streamline analysis results coincide closely with the CFD results.

Soot formation and oxidation process can be predicted by using the soot formation model in CFD.
Hessel and Foster [7] performed simulation on flow and combustion in Homogenous Charge Compression Ignition (HCCI) engine using EnSight to extract the results obtained from CFD.
Human blood flow simulation is done by David [10] where he used the model of carotid bifurcation.
Methods In this study, particle tracking is performed by post processing (using an efficient routine written in Matlab codes) the results of simulation of combustion inside the direct injection diesel engine which is done by Wan Mahmood [12] using KIVA-3V Release II in CFD.
Oefelein, Large-Eddy simulation of swirling particle-laden flows in a coaxial-jet combustor, Int.