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Influence for Brake Torque of Hydraulic Retarder with Shape of Circulation Circle Chu Yaxu1,a, Lv Jinhe2,b 1East campus of Beihua University in Jilin city ofJilin province,China 2East campus of Beihua University in Jilin city of Jilin province,China acyx_1964@sina.com,b350573500@qq.com Keywords: CFD; the RNG turbulence; the shape of circulation circle; numerical simulation Abstract.
Based on CFD software platform, numerical simulation of 3-D with the internal characteristic of hydraulic retarder with different shape of circulation circle was simulated, and the RNG turbulence was adopted.
One of the main factors that influent the performance of hydraulic retarder was the shape of circulation circle, high braking torque can be gotten with the proper shape of circulation circle. numerical simulation was simulated with different shape of circulation circle based on the CFD software platform.
setting the calculation target according to the convergent curve is difficult to judge whether it achieve convergence, Because the simulation calculation of hydraulic retarder are unsteady calculation, Because the simulation calculation of hydraulic retarder are unsteady calculation, monitoring the pressure of the oil inlet and rotor torque changes in the view of convergence curve.
[5] He Ren,Yan Jun. 3D Numerical Simulation and Performance Prediction of Hydraulic Retarder[J].Machine Tool & Hydraulics,2009(3):250-253.

Such difficulties lie in the usual CFD problems such as: turbulence modeling, flow separation, boundary layer, cavitations.
The simulations are supposed to be converged when the residual is below 10-5.
The accuracy of the CFD based on RANS equation is dependent on the used turbulence model.
According to the steady flow simulation, the RNG K-epsilon turbulence model yields to provide the most accurate results, so it is recommended to do such this kind of simulation.
This study of the steady simulation of the flow around marine propeller shows that, CFD is a powerful and reliable tool for calculating the propeller hydrodynamic characteristics.

Eilmer Simulation Results.
CFD validation was performed through a comparison of the 2D and 3D results.
The case was split into two sub-models to minimise simulation time.
Eilmer Simulation Results.
[2] Wilcox, D.C. 2006, Turbulence modeling for CFD, DCW Industries

Their respective heat loss is calculated and applied in the CFD software.
There are also examples of thermal optimization with the help of CFD [6].
Geometry For an accurate CFD simulation, a fine-quality numerical mesh is crucial.
Fig.9: Velocity vectors colored by temperature Summary The original goal at the beginning was to get a good match in terms of temperature between the CFD simulation and the measurement data at the stator winding.
Matyushenko, Best Practice: RANS Turbulence Modeling in Ansys CFD, Ansys Germany GmbH and NTS, St.

Numerical Simulation on Indoor Thermal Environment of Radiant Flooring Cooling System with Displacement Ventilation Wei Cai1, a, Wen Lv1, b, Lexian Zhu1, c and Pengfeng Yang2, d 1Institute of Building Energy Conservation, Ningbo University of Technology, China 315016 1School of Civil Engineering and Architecture, Ningbo University of Technology, China 315016 azlcaiwei@sina.com, b1980403640@qq.com, c476644201@qq.com, dnbjianhuan@sina.com Keywords: Numerical simulation, radiant floor cooling, CFD.
The thermal environment of the model office space was analyzed using Computational Fluid Dynamics (CFD) method.
Simulation Analysis, using CFD, of the indoor thermal environment of an office space cooled by a radiant floor cooling system combined with displacement ventilation system was then conducted.
Fig. 1: Office space for numerical simulation.
Simulation of indoor air flow was conducted based on a zero-equation turbulent model.

For the reducing of the time cost, the Kriging model was used for the surrogate model instead of the CFD simulation during the optimization design.
There are four main aspects in the optimization design system: geometry parameterization, optimization algorithm, CFD numerical simulation and the mesh deformation.
It is well know that the CFD simulation takes the most time of the whole optimization design.
So surrogate model was used instead of the CFD simulation.
CFD simulation is at the condition of : Ma=0.86, Cl=0.47, Re=4.3E6.

aqianyiwhu@gmail.com, bTshang56@126.com, c 64673543@qq.com Key words: Residential district, CFD, wind environment, numerical simulation.
The research methods of outdoor wind environment include outdoor measurement, wind tunnel tests and computer simulations based on fluid dynamics (CFD) and so on.
Fig. 1 Satellite image of residential area Fig. 2 Model of the residential district buildings CFD Numerical Simulation: Computing Model, Computational Domain and Boundary Conditions The calculation model.
The termination standard of CFD simulation algebraic equation is determined by continuity equation and momentum equation residuals 1.0 E-3, the energy equation residuals 1.0 E-6.
[2] Shuzo Murakami write, Zhu Qingyu translate: CFD and building environment design, Beijing: Chinese building industry press,2007: P2

Multiphase Flow Simulation and the Analysis Method of the Pressure Drop In the Vibrated Fluidized Bed Baichun Lia ,Wenqiang Linb and Lamei Wang c Liaoning Province, Shenyang City, Heping District，Wenhua Road,Lane 3, No.11,China a baichun_li@foxmail.com, bduli26@126.com,cwlamei@126.com Keywords: Computational fluid dynamics (CFD), Multiphase flow simulation, Vibration fluidized bed, drop, Fluent Abstract.
At the same time based on computational fluid dynamics (CFD), we use Fluent as a tool to carry out the corresponding multiphase flow simulation experiments.
The simulation results have a good consistency with the experimental results.
This paper will combine theory, experiments and CFD simulation of multiphase flow to explore a variety of particle size analysis method in case of pressure drop.
Multiphase Flow Simulation Model.

Simulation Research on Mixing Structure of Kitchen Waste Biological Processor Song Lin*1, a, Ran Zhang1, b, Zhuang Ma1,c, Chuanyang Liu1,d 1Department of Mechanical and Electrical Engineering North China University of Technology, Beijing, China alinsong@ncut.edu.cn, bverus2@163.com, c1271991056@qq.com, d852970697@qq.com Keywords: Mixing Structure, Kitchen Waste Biological Processor, CFD, Simulation Abstract.
The Simulation of Mixing Structure Using the CFD simulation software to research the mixing structure of the kitchen waste biological processor can reduce the times of experiment, save money and time, and solve some difficult problems restricted by experimental techniques.
Simulation in Fluent.
Intuitionistic and credible simulation results can be got by using CFD software.
Simulation and Optimization in Stirred Tank for High Viscosity Fluids [D].

Computational fluid dynamics (CFD) is a simulation tools, which use powerful computers and applied mathematics to create model fluid flow situations for the prediction.
The average of velocity at the outlet of holes, were analyzed and compared with results from simulation in each model.
(BIG) and Khon Kaen University, for information and manual of continuous belt air-blast freezers and support software program for simulation (ANSYS 14.0) in this work.
Sun, Computational fluid dynamics (CFD) – an effective and efficient design and analysis tool for the food industry: A review.
[6] Nahor, H.B., et al., CFD model of the airflow, heat and mass transfer in cool stores.