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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.

A CFD numerical model to compute airflow field of blower was established, and the fan parameters were optimized.
The flow simulation CFD method.
CFD model established.
Fig. 1 Geometric model of blower Fig. 2 FE model of blower Simulation result.
According to the table, the simulation results were close to be the experiment ones, and the errors were less than 7 percent, thus the CFD model of blower could be believed to be accurate and the simulation results were reasonable.

Speedy design method for fluid viscous dampers based on numerical simulation by CFD Qiang Guo1,a, Yan-bei Chen1,b, Xiang-liang Ning1,c, Lu Tang1,d 1Zhuzhou Times New Material Technology Co., Ltd, Zhuzhou, 412007, Hunan, China amrq_guo8296@126.com,bchenyanbei@teg.cn,cningxiangliang@teg.cn,dtanglu2009@teg.cn Key words: viscous fluid dampers; the power law characteristic of silicone oil; dynamic mesh model; numerical simulation; Abstract: Bi-directional-cylinder viscous fluid dampers are studied numerically.
The damping force of the viscous damper samples is simulated by professional CFD software based on the dynamic mesh model, Based on comprehensive analysis of the results, the experiential design method of large-tonnage-damping-force viscous fluid dampers is finally established.
Numerical simulation of viscous damper On behalf of geometric symmetry of the actual structure of the viscous damper, a half physical model is built by professional CFD software, the physical model is shown in Fig.3 with special boundary conditions described.
Fig.4 Simulation results of dynamical simulation of damper The comparative analysis of numerical and experimental results will be discussed in the next chapter.
As is shown in Fig.5, the numerical simulation curves are basically consistent with experimental curves, which indicate the feasibility of the numerical simulation method and also the model.

The deeper and wider range of CFD application, the more complicated CFD problem.
Yang: CFD Simulation Credibility Analysis Based on Grid Computation.
National CFD Conference, China, 2004 [2] C.Y.
Guo: Effect of Near-Wall Grid Size on Turbulent Flow Simulation.
Huang: Effect of Grid shape on Simulation Results.

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)

Numerical Simulation of Agitated Flow Field of Submersible Mixer Based on Computational Fluid Dynamics Xu Weixing, Yuan Shouqi Jiangsu University, Zhenjiang, Jiangsu, China Xu_wx@ujs.edu.cn Keywords: Submersible mixer, Agitated flow field, Numerical Simulation Abstract.
At the same time, CFD can provide the full details of the flow.
This paper deals with the numerical simulation analysis on the agitated flow field of the submersible mixer (its diameter is 360mm, and its rotational speed is 1430r/min) by CFD software Fluent.
[4] Wang Fujun: Computational fluid dynamics analysis--CFD software Principles and Applications, Tsinghua University Press, Beijing(2004)
[8] Zhang Linjin, Ye Xuechu, 2005, "CFD Numerical Simulation on Turbulent Flow in Stirred Tanks, Journal of Nanjing University of Technology, Vol.27(2003), p.59-63

Study of Architectural Design Method Based On Concept of Wind Environment DUAN Xiang1,a, XU Wei-qi1,b 1School of Civil Engineering and Architecture，Wuhan Polytechnic University，China,430023 ajintang28@163.com, bxuweiqi00608@163.com Keywords: Wind Environment，Architectural Design Method，CFD Simulation Abstract.
Data Simulation Method Being Adopted for the Prediction of Outdoor Wind Environmental.
Computa-tional Fluid Dynamics is the software being used more generally at present.It is scilicet simulation analyzed with CFD software for wind environment in building clusters.Through the simulation of the airflow by CFD,the region of strong wind and improper ventilation can be viewed intuitionally.Thus,combining analysis results,designers may attain the goals that satisfies the request of natural ventilation finally by optimizing the total plane layout and physique space,meanwhile,it can be as the base of evaluation to wind environment(see Fig.3).
Fig. 3: Application of CFD on the Wind Environment Simulating Graph of a Residential Quarter.
References [1] R.Yoshie,A.Mochida:Journal of Wind Engineering and Industrial Aerodynamics,Vol.95(2007), p.1551 [2] Yoshihide Tominaga:Journal of Wind Engineering and Industrial Aerodynamics,Vol.96(2008), p.1749 [3] C.W.Tsang,K.C.S.Kwok,P.A.Hitchcock:Bilding and Environment,Vol.49(2012),p.167 [4] Yoshie,R,“CFD analysis of flow field around a high-rise building”,in Summaries of Technical Papers of Annual Meeting,Environ,Engg, II, AIJ,(1999),in Japanese [5] Kataoka,H,“Large Eddy Simulation of building”,in Summaries of Technical Papers of Annual Meeting,Environ,Engg,II,AIJ,(2003),in Japanese [6] Information on http://www.abbs.com.cn/

Cfd simulation Three Simulation Cases of Planning and Design. 1) Case of the Existing Planning and Design This existing planning and design case (Hereinafter referred to as case-1) consists of three rows multiply four lines prefab houses (12 in total).
The CFD simulations use standard k–ε 3-dimensional turbulent flow model.
These sections’ facet average wind velocities (v) which reflect the natural ventilation below 2.8m height above ground were extracted from the CFD simulation results of 3 cases respectively.
That indicates the improved building is a key to the significant improvement in ventilation environment. 4) In our CFD simulation researches we only take wind pressure into account.
[10] Kazuya Takahashi, Harunori Yoshida, Yuzo Tanaka, Noriko Aotake, Fulin Wang, “Measurement of thermal environment in Kyoto city and its prediction by CFD simulation,” Energy and Buildings, vol. 36, 2004, pp.771–779

Finally, through calculation of CFD simulation software, the new mixer can achieve good mixing effect and satisfy the requirement of experiment.
Introduction Oil-gas-water three phase flow experimental facility is a set of oil Wells, multiphase flow pipeline transportation simulation and experimental studies of multiphase flow as the integration of indoor small experiment device. [3] To be done according to the experiment content, the device profile flow diagram as shown in Fig.1.
This experimental facility, belongs to the indoor simulation experiment, is made in a transparent pipe simulation wellbore and realizes the observation of gas-liquid two phase flow pattern changing process, which is to ensure that two phase fluid kinematics and dynamics parameter variation range and accuracy from the simulation experiment.
We can us the CFD (Computational fluid dynamic) software to simulate the mixture effect and to solve its mixing parameters.
By using CFD software to simulate calculation, i.e., first through the specialized pretreatment software Gambit drawing and initial meshing and so on.

Newly developed mathematical and physical model using CFD simulation is used for simulation of hygrothermal stress in chosen part of the ice arena roof construction, which substantially affects quality, utility properties and life time of timber roof components.
Computer simulation methods The available measured data did not provide sufficient information for the required risk analysis of wood degradation, therefore, to obtain the necessary information, numerical CFD simulations in the Fluent program and our own numerical model were used.
Simulations were carried out on two simplified geometries of the arena, specifically a 3D model of the arena quarter, see Fig. 1c) and a 3D model with a periodically repeating segment of the arena, see Fig. 1d).
The very good accordance of the experiment results with the CFD simulation, in the order of inaccuracy of up to approx. 5%, allowed us, for the final heat-moisture assessment of wooden elements, to use the experiment values and to add the missing surface temperatures on both strips of the girder from the simulations.
Basic equations for determining EMC (equilibrium moisture content) used for simulation are provided, for example, in publication [3].