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Study on Vehicle Emissions Dispersion in Asymmetrical Street Canyons and Proper Location of Air Intake for Ventilation System GUOHUA Gao1, a, JING Liu1,b, FEI Ma1,c ,WEIDONG Luo1,d 1 School of Mechanical Engineering, University of Science & Technology Beijing, Beijing, China agaoguohua2011@163.com, bliujing_ustb@163.com, cyeke@ustb.edu.cn, dluowd@ustb.edu.cn Keywords: CFD, Street canyon, Traffic pollutants, air inlets Abstract.
Numerical Simulations Model Description.
In the simulation, street canyons’ lengths are assumed to be greater larger than their width.
The simulation results shows that personal exposure of people are lower in the street canyon Ⅳ than other street types studied in this paper.

The Passive Ventilation Energy-saving Strategies of Urban Long-distance Bus Station Guohua Tian1,a, Tingshen Li2,b, Xianguang Gu3,c and Xingyu Xie4,d 1JiangSu Institute of Architectural Technology, Xuzhou, Jiangsu, 221008, China 234School of Mechanics & Civil Engineering ,China University of Mining and Technology, Xuzhou, Jiangsu, 221008, China atgh0208@163.com, b407255050@qq.com, c24915017@qq.com, d827777615@qq.com Keywords: Bus Station, Passive Ventilation, CFD Abstract.
General layout and some perspectives of the station Simulation analysis of ventilation status The article chooses the waiting hall as the main study object, to simulate and analyzes Xuzhou Long-distance Passenger South Station.
Fig.2 shows the simulations of the station, because the first layer connects with the distribution hall, the entrance can bring fresh air to the interior, with the outlet disposed in parallel, to improve the level of air flow to some extent.
Now, it is necessary to quantify the simulation analysis to verify the accuracy of above strategies.
The results of simulation analysis: Fig.7.

The effects of three different treatment methods including introducing a gap, area contacting and cylindrically bridging on flow and heat transfer performances of structured packed beds of particles were investigated with CFD methods.
In Wang [17]’s study, mixing processes of hot and cold fluids in a tee with and without sintered copper spheres were simulated by Fluent using the large-eddy simulation (LES) turbulent flow model and the sub-grid scale (SGS) Smagorinsky-Lilly (SL) model with buoyancy.
Saturated water convection heat transfer in ordered three-dimensional porous media investigated numerically using a CFD software by Wang [18].
The operating conditions are numerically simulation with no slip adiabatic boundary conditions on the pipe wall by using Fluent software subject to uniform heat flux.
Jiang, Numerical Simulation research on heat transfer and fluid flow for pebble beds, J.

Computation of Aerial Towed Cable Aerodynamic Performances with Large Eddy Simulation Wei Han, Xiao Wei Kanga, Yun Liang Wang, Xiao Hong Zheng Naval Aeronautical and Astronautical University, Yantai 264001, China aemail: kang1021980@126.com Keyword: Aerial towed system, Aerodynamic performance, Large eddy simulation Abstract.
Nowadays, there are three methods which can simulates the turbulence such as DNS (Direct Numerical Simulation), LES (Large Eddy Simulation), and RANS (Reynolds- Averaged Navier-Stokes).
Xu: Hydraulic Resistance Analysis in Towed Wire Rope Modeling, Computer Simulation, Vol. 28 (2011) No.1, p.123 (In Chinese) [8] F.
Wang: Dynamical simulation of towed and tethered cable systems, Ocean Technology, Vol. 24 (2005) No.2, p.69 (In Chinese) [10] J.
Huang: Ansys-CFD Analysis on the Flow Field of Helical Strakes around Riser, Ship & Ocean Engineering, Vol.39 (2010) No.4, p.151 (In Chinese)

aChenyong880@yahoo.com.cn, bliangxt666@126.com.cn, cZeng-jhua@263.net.cn, d13882393081@163.com.cn,eliangxt666@163.com.cn Keywords: converter steelmaking, oxygen lance, oxygen jet, numerical simulation, metallurgical effect Abstract: The lance system is one of the important link of converter.
The numerical simulation for a three-dimensional oxygen lance nozzle was carried out according to the fundamental parameters of PZH steel, the characteristics of the oxygen jet were analyzed and discussed.
Numerical simulation of oxygen lance To accurately detect each parameter and actual performance, the design lance was simulated by CFD in this paper.
Conclusions (1) The numerical simulation for a three-dimensional oxygen lance nozzle was carried out according to the fundamental parameters of PZH steel.
[2] WANG Wen-jing, ZHAO Hong-xin,PAN Yi-fang,etc,in:Numerical Simulation on Flow Behavior of Nozzle Jets in Oxygen Lance.

The Steady flow simulation to selected the delta wing model for different angles of attack in the Maher number.The law of flow field changes with the angle of attack is gotten.Through the FLUENT simulation,The variation tendency of coefficient of lift and drag in the different angle of attack is gotten.Further reveals the change rule of Maher number, pressure, velocity and other parameters in the different angle of attack.With increasing angle of attack, Maher number distribution is sparse of the same position increases and the greater numerical.the distribution of velocity vector is sparse of the same position increases and the greater numerical.the pressure distribution is sparse of the same position increases and the greater numerical.
The master equation of numerical simulation to the wing spoiler can use Euler equation can also use N-S equation.
The fluid is compressible ideal gas, the set up of outer boundary condition according to the “far field pressure”.The far field pressure boundary condition:For the simulation of infinite free compressible flow,the free stream Mach number and static conditions known.
Summary From the simulation results we can get the following conclusions
[2] Zhang Jun,Zhao Feng,Zhou Lian Di et al.Flow visualization experiments and CFD simulation on flow around airfoil at large attack angle,J.Ship building of China Vol.41 (2000),p. 22-27

The results provided by numerical simulation of wind action on the building were used to make a comparative study between different patterns of wind fences.
In order to identify an optimal solution for reducing the wind pressures on the external walls of the building, a series of numerical simulation were performed in Ansys CFX.
Comparing the results obtained from the numerical simulation, the porous wind fences represent the best solution for a small distance (1 meter) between the wind fence and the building.
Furthemore, the numerical simulation shows that for the same porosity (10%) the pattern of the pressure distribuition on the building is strongly related to the patern of the wind fence.
[8] Franke, J., Recommendations of the Cost Action C14 on the Use of CFD in Predicting Pedestrian Wind Environment, The Fourth International Symposium on Computational Wind Engineering (CWE2006), Yokohama, Japan, 2006.

For the analysis of various extruder models are used not only testing, but also diverse simulation techniques.
I�TRODUCTIO� Not only testing but also diverse simulation techniques are recently used to analyze various extrusion models.
(a) Standard Plate modelling data value (b) �umber 1 Plate (c) �umber 2 Plate (d) �umber 3 Plate (e) �umber 4 Plate (f) �umber 5 Plate (g) �umber 6 Plate Fig. 6 Rate of Plates Fig. 7 shows plate simulation values in graphs.
[3] Dong-Seong Kwag, Woo-Seung Kim and Min-Young Lyu, 2001, "Three-Dimensional Heat and Fluid Flow Simulations for Non-Newtonian Fluid in a Single Screw Extruder", KSME, pp. 337~342
"Cfdesign Technical reference : Upfront CFD"

The reviewed works are limited to ductile material erosion and four categories: erosion mechanism, parametric studies, material removal modeling and simulation modeling.
The reviewed works are limited to ductile material erosion and four categories: erosion mechanism, parametric studies, material removal modeling and simulation modeling.
A CFD simulation of ultrahigh velocity waterjets and abrasive waterjets has been presented.
Aristomenis Antoniadis，A finite element-based model for pure waterjet process simulation，Int J Adv Manuf Technol (2007) 31: 933–940 [25] H.
Liu, A study of abrasive waterjet characteristics by CFD simulation, Journal of Materials Processing Technology 153–154 (2004) 488–493 [26] T.

Numerical simulation study of the influence of structural parameters of combustion chamber on in-cylinder flow field of diesel engine Guocheng Li 1,a, Ping Sun 1,b, Peng Hu 1,c 1School of automobile and traffic engineering, Jiangsu University, Zhengjiang, China 212013 aguowuhappy@sina.com, bsunping@ujs.edu.cn, chptmisme717@126com.cn Keywords: Diesel engine; In-cylinder flow; Combustion chamber; Structural parameter Abstract: Based on the entity model of the type 4B26 diesel engine, calculated by CFD FIRE and combined with the software BOOST for the initial boundary conditions, the influence of combustion chamber structural parameters, such as boss height, surface-volume ratio and diameter-depth ratio of combustion chamber, on in-cylinder flow field of diesel engine was investigated.
According to Boost software, in the simulation result, the air inlet temperature, pressure and swirl ratio is taken as 385K, 0.18MPa and 2.03 respectively.
In Fire software, the gas flow simulation in the design cylinder solves the average transportation according to the mass conservation, momentum conservation and component conservation and the relatively accurate k-ζ-f turbulent flow model is adopted.
[2] Luo Maji,Wen Zui,Liu Gaofei,et al.numerical simulation of intake compression process for non-road diesel.Journal of Wuhan University of Science and Technology,2010,32(10):91~95 [3] AVL Fire User Manual[R].AVL List GmbH Graz,2002
[4] Luo Maji,Wen Zui,Liu Gaofei,et al.numerical simulation of intake compression process for non-road diesel.Journal of Wuhan University of Science and Technology,2010,32(10):91~95