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At present, research scholars in wind engineering have done a lot of research work for downburst wind from the aspects of theoretical research, physical modeling and CFD simulation [3].
As an evidence of physical simulation data, for its versatility and economy, CFD simulation has been popularized and applied as an effective method in the field of wind engineering and obtained a certain achievement.
However, the various meteorological factors of downburst in the occurrence and development, such as the micro-physical process and multi-scale nature of atmospheric motion, are not involved in CFD simulation; so the simulated result of downburst wind is always distorted and can not be applied to the design specification.
Fig.1 shows distribution of the first, second, third domain for simulation.
Numerical simulations of impinging jets with application to downbursts.

CFD Model Set up In the simulation, the two dimension(2-D) axisymmetric model is applied which results are very closed to the 3-D model [3].
Validation of CFD Simulation The entrainment ratio of experimental data from Chunnanond[1] along steam-jet pump at different geometries of primary nozzle is shown in Table 1.
At the same time, the simulation results of this investigation are also to be list in the table.
The results of CFD were also validated with experimental data provided by others[7].
CFD method has been used successfully to simulate and capture the flow phenomena in steam-jet pump.

Table 2 lists different factors for the CFD analysis.
Using the results of the CFD analysis, a channel width of 2.5 mm was used.
Fig. 7 shows the simulation results for a forming force of 110 kN.
The channel heights were measured and compared with simulation results, as listed in Table 5.
Figure 7 The simulation results for 2D and 3D Table 5 A comparison of the numerical and experimental results Forming load = 110 kN Channel height (mm) Experiment 0.747 2D simulation 0.817 3D simulation 0.805 A comparison of the channel height for the full 3D model and the experiment.

The Numerical Simulation on Diesel Particulate Filter Based on CFD Technology Guoliang Hua, Fei Dongb, Xi Yangc and Yunpeng Dud* School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China ahuguoliang668@sohu.com bjsdxdf@163.com chandsome_yang@yeah.net d,*Corresponding author, jsdxdyp@163.com KEY WORDS: Diesel engine, DPF, Soot particulate, Simulation Abstract.
In this process, the internal parameter settings of the DPF simulation was described in detail, while the simulation results was obtained by analysis.
The research of DPF simulation mainly stayed on the stage of model improvement and method optimization.
After finishing the whole simulation, the changing process of DPF temperature field was determined.
[5] AVL, Fire, CFD Solver, 2008

Modeling of natural ventilation in solar chimney and optimization of the channel profile by CFD method Yaxin Sua, Feining Lei, Yufeng Xue School of Environmental Science & Engineering, Donghua University, Shanghai 201620,China a suyx@dhu.edu.cn Keywords: natural ventilation, solar chimney, numerical simulation, chimney structure Abstract.
Results Comparison of CFD results with experimental data.
The maximum error between the CFD and tested results was less than 13%.
In general, the present CFD could provide a reasonable calculation results.
In order to study the effect of solar chimney height on induced air flow rate and flow pattern, the CFD simulation was carried out for the chimney with the following sizes: length of 1m, width of 0.7m and height of 0.7- 6.3m.

CFD Simulation Analysis on Fire Feature of Tunnel with Different Sections of Smoke Outlet Beihua Conga, Xin Hanb and Jun Linc Shanghai Institute of Disaster Prevention and Relief, Tongji University, Shanghai 200092, China Tongji Antai R&D Center of Engineering Disaster Prevention, Shanghai 200032, China abhcong@tongji.edu.cn, bhanxin@tongji.edu.cn, clinjun@tongji.edu.cn Keywords: road tunnel fire, smoke outlet, smoke extraction system, FDS simulation Abstract.
In order to further understand the fire smoke feature affected by different sections of smoke outlet in road tunnel and bring forward some reference on section selection of smoke outlet, this paper carried out CFD simulation analysis on fire feature of a certain large scale cross-section road tunnel with different sections of smoke outlet.
Numerical Simulation Physical Model.
The simulation model of the tunnel is shown in Fig. 1.
Conclusion Though the analysis of numerical simulation results, some brief conclusion could be achieved.

In this paper, numerical and physical simulation methods were employed to verify mutually and analyze the hydraulic characteristics in a tangential vortex dropshaft.
As an assistant tool, the simulation results of CFD software (e.g., Fluent, CFX) had some shortcomings as well.
So, that is certainly a reasonable approach that the results of numerical simulation was compared and verified with hydraulic scale model.
A fully three-dimensional and steady-state CFD analysis was conducted using the commercial solver FLUENT™{TTP}8482 .
Q=2.0 m3/s Fig. 8 Comparison of total pressure calculated by CFD and physical model(Z=0) Conclusions The hydraulics of tangential vortex dropshaft was studied through numerical and physical simulation methods.

The Simulation Study on 3D Gas Flow Field and Structure Improvement with Tower Continuous Vacuum Dryer Zhijun Zhanga, Shiwei Zhangb, Chenghai Xuc School of Mechanical Engineering and Automation, Northeastern University, Shenyang110004, China a zhjzhang@mail.neu.edu.cn, bshwzhang@mail.neu.edu.cn, cxch1940@126.com Keywords: Tower continuous vacuum drying, Gas flow field, Structure improvement, CFD Abstract: The 3D gas flow field, including the gas pressure and gas velocity was studied by computer fluid dynamics simulation (CFD).
In order to illuminate the flowing characteristic of gas, the computer simulation is a useful method except for experimental research.
The Computational fluid dynamics (CFD) is a powerful tool to study the flow field of drying room.
Simulation of the hydrodynamics and drying in a spouted bed dryer, Drying Technology,2007,25:59-74 [4] ZHONG Siqing, CHEN Qingling, and CHEN Zhiqiang.
Turbulence Modeling for CFD.

Computer simulations of the VB method could be an effective tool to optimize the growth process and reduce the production costs.
The computer simulations of the growing process could be an effective method to reduce the costs of the experiment and search the best parameters.
The 2D CFD models are reported in CaF2 and CdTe material systems performed on the VB method and the melt is enclosed in rigid walls having the corresponding temperature profiles with the enthalpy-porosity based approach [9].
However, the numerical simulations have not yet been applied to the growth of PbI2 single crystals with VB method.
Based on the numerical results, the experiment of PbI2 crystal growth with VB method was also carried out to verify simulation parameters.

Based on CFD numeric simulation for hydraulic retarder under full-filled condition, the pressure distribution functions of the rotor blades surfaces are approached by coordinate transformation and surface fitting.
Key Issues to be Resolved As the CFD and FEA has different geometry and grid system, the interested variable is not the same.
Analysis Process 3.1 The Export of CFD Simulation Results The internal characteristics of flow is simulated by CFD before the finite element analysis [1-2].
Conclusion Based on CFD numeric simulation for hydraulic retarder under full-filled condition, the pressure distribution functions of the rotor blades surfaces are approached by coordinate transformation and surface fitting.
References [1] Yan Jun,He Ren and Lu Ming．Numerical Simulation for Hydraulic Retarder with Different Blade Number[J]．Journal of JiangSu University (Natural Science Edition)，2009,Vol.30(1), p. 27-31.