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A mathematical model of complex thermal processes with combustion, radiation and flow in rotary hearth furnace (RHF) for pellet direct reduction is established with CFD commercial software Fluent.
The numerical simulation of temperature field and flow field in RHF is widely carried out in steel rolling process[3].
For the accuracy of simulation, the mesh of burners, nozzles, pellets, feeding port and discharging port are local refined.
Numerical Simulation Method.
[3] Xiaobin Yang, Zeyi Jiang, Lin Lin, Xinxin Zhang, Lixin Yang, Haiyan Zhang: CFD Numerical Simulation of Thermal Process of Rotary Furnace and Its Application.

The size of the simulation area is 40m×67m×9m.
Simulation Results and Comparison of Natural Ventilation 4.1.
Through comprehensive comparison and analysis, results can be concluded that the simulation results are consistent with the test data before. 4.2 Simulation after the Window Sizes Changed The simulation is based on the expansion of magnifying the window sizes of the north and south.
Conclusion With the help of a CFD simulation technology, this paper establishes the mathematical model and simulation models of the indoor air flow. 
The indoor natural ventilation and thermal comfort based on the CFD simulation.

Fluid flow inside radial ventilation duct is one of important facts which to decide the effect of ventilation and cooling, there is important significance to investigate.In this paper,according to the theory of Computational Fluid Dynamic(CFD),a YKK400-6, 690kW medium size high voltage asynchronous motor was taken as an example.Created its 3D stator and rotor radial duct physical and mathematical model,basic assumptions and boundary conditions are determined according to CFD theories.The fluid fields are calculated and analyzed,and fluid field distribution inside radial ventilation duct is shown.Base on the length of the stator ventilation channel as a constant,changing the radial position of the stator ventilation channel peri-axle terminal,and the fluid flow characteristics are shown when the radial position was changed.Analyzing the fluid flow characteristics on either side of the stator winding,and obtaining the influence of the radial position of the stator ventilation channel peri-axle
In this paper,the YKK400-6, 690kW medium size high voltage asynchronous motor is taken for an example.According the CFD theory and three-dimensional finite volume method for building the 3D physical and mathematical model,and solving it.Based on this,for the different radial positions of ventilation channel peri-axle terminal,analyzing their flow characteristic,and obtained some significant results.
The walls of the ventilation channel,upper and bottom layer surface of iron,and outer surface of main insulation are no slip conditions,the fluid velocity is 0on these surfaces.The model inlet pressure and outlet pressure are standard atmospheric pressure.Rotational flow field simulation using multiple reference frame model(MRF).The rotational velocity is 994[8].
● According to the theory of CFD,calculate the flow field inside the radial ventilation duct,obtain the fluid velocity in anywhere.It is found that the past that the fluid velocity is symmetrical along slot center line of radial ventilation duct is incorrect

Instead, rapid developing CFD technology can give a satisfied platform to make untouched real-time measurements of the whole flow field possible.
Basically, three types of numerical methods for analyzing such turbulent flow can be employed: DNS (Direct Numerical simulation), RANS (Reynolds Averaged Navier-Stokes equations) and LES (Large Eddy simulation).
On turbulent vortex shedding flow passed 2D square cylinder predicted by CFD[J].Journal of Wind Engineering and Industrial Aerodynamics, 1995(54/55): 191-211
Large eddy simulation of turbulent vortex shedding flow passed 2D square cylinders[A].
Engineering Application of Large Eddy Simulations FED Vol 162.ASME, 1993

Simulation on Torpedo Unsteady Hydrodynamic with the Movement in the Longitudinal Plane Yang Ming, Zhao Shi-ping, Wang Han-ping, Wang Lin-peng, Wang Shao-zhu School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China e-mail: yangming19850420@163.com Keywords: Underwater, Maneuvering, Unsteady, Dynamic mesh, Hydrodynamic.
In order to capture the characteristics of the flow field and estimate the hydrodynamic coefficients accurately, it needs the help of modern CFD technology.
CFD/CSD Couping Numerical Computational Methodology.
Six-DOF Simulation of Light-duty Reconnaissance and Precise Attack UAV under Unstable State Interference of Missile Separation.
(in Chinese) [6] Tian Shuling, Wu Yizhao, Xia Jian, Numerical Simulation Research of Unsteady Flow Field Around Helicopter in Forward Flight on Dynamic Overset Unstructured Grids.

And then, the amounts were of smoke and carbon emissions were compared, the pressure simulation was made based on CFD software.
The cylinder pressure simulation map at 350 °CA According to initial conditions and boundary conditions, different ratios of burning process were simulated, and the simulation results can be obtained with different pressure.
The cylinder pressure simulation map at 355 °CA Fig.5.
The cylinder pressure simulation map at 360 °CA Fig.6.
The cylinder pressure simulation map at 365 °CA Fig.7.

Numerical Simulation of Effect on Billet Casting Q235 under Inner-out Cooler Lang Li1,a and Guoping Chen2,b 1School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan ,621010,China 2School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan ,621010,China alilang@mail.ustc.edu.cn, bchenguoping@swust.edu.cn Keywords: billet, inner cooler, flow field, temperature field, numerical Simulation.
With the help of Fluent -a kind of CFD business soft ware, a numerical simulation is undertaken to testify the condition of the molten steel in the inner-outer cooling mould coupled by flow field and temperature field.
Math-phy Model[2~4] and simulation conditions Governing Equations Conservation of mass equation (1) Conservation of momentum equation (2) Energy equation
Numerical simulation and results The size of the mould is 165mm×165 mm,with 800mm long and 10mm thick of the wall.The inlet diameter is 96mm,the outlet 30mm,and the immersing depth is 150mm.And the inner cooler is made of pure copper with the shape of U,which is 340mm high with the bent radius of 54mm and the immersing depth of 200mm.Besides,the casting depth of molten steel is 200mm;the pull velocity is 1.2m/min.Thermophysical Properties are listed in Table .1.
References [1] XiaochaoCui,ZicaiLiu,JingSong and YouhongWang .Numeric Simulation of Three Dimensional Flow Field of Molten Steel in a Mould with High Efficiency Inner and Outer CoupleCooling.SPECIAL STEEL. 2005.vol.26 No.1 p.9-11 [J].

In recent years, advanced computer and the mature computational fluid dynamics (CFD) commercial software developed fast, and using the CFD software to acquire hydrodynamic coefficients has the advantages of low cost, variable parameter, shorter time-consuming.
Steady-state maneuverability experiment simulation The simulation of PMM experiment includes steady –state motion simulation and unsteady-state motion simulation .Some parameters in the steady-state test simulation by Fluent should be set as follows: choose the first order implicit solver, SST turbulent model; choose SIMPLEC to compute velocity-pressure coupling; Pressure discretization is Standard and momentum discretization, turbulence kinetic energy discretization and specific dissipation rate are second order upwind.
Unsteady-state maneuverability experiment simulation The unsteady-state maneuverability experiment simulation includes heave motion, sway motion, pitch motion and yaw motion.
The results and the analysis 4.1 All the simulation of experiment is completed．
Hydrodynamic prediction results by simulation system The hydrodynamic coefficients of calculation are used to the simulation system of movement. 5.1 Straight course in horizontal plan.

Oil blocking effects of the new type oil boom are numerical simulated by using the CFD software Fluent.The results show that diversion structure improves the critical failure rate significantly, so do the oil blocking effects.
Besides, numercail experiments are simulated by using of CFD software Fluent.
The numerical simulation method taken in this paper is reasonable, effective and reliable.
[4] Ning Cheng-hao, Numerical Simulation of Boom Failure[D].Beijing: Beijing University of Chemical Technology,2002
Oil Booms in Various Sea States Blocked Oil and Shape Optimization of Numerical Simulation[D].Dalian:Dalian Maritime University,2007

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