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Comparative study on external flow simulation of passenger car with complex underbody and flat underbody Yan Xu1, a, Qiao Xin1, b, Zhao Zhiming1, c, Ye Jian1, d, Liao Lei2, e, Hu Xingjun2,f and Wang Jingyu2,g 1Changan Auto Global R&D Center, Chongqing 401120, China 2State Key Lab of Automobile Simulation and Control, Jilin University, Changchun 130022, China ayx291215@163.com, b22430161@qq.com, ccfdzhaozm@163.com, dcatia420@yahoo.com, eaillieo@163.com, fhxj@jlu.edu.cn, gwangjy@jlu.edu.cn Keywords: comparative study, complex underbody, external flow, automobile aerodynamics, CFD Abstract.
Introduction With the development of computer technology and CFD, increasing numerical simulations of external flow of vehicles have been applied to automotive aerodynamics.
Vehicles have complicated underbody structures and if all the details are kept in the CFD simulation, grid quantity will be largely increased and may even cause other new problems.
Consequently, it’s necessary to simplify the complicated underbody structure in the pre-process of CFD, which will increase the efficiency and realizability of flow field simulation.
Numerical Simulation Geometric model and domain.

CFD (Computational Fluid Dynamics) Simulation.
A solid model establishment is required for CFD simulation.
Fig. 4 CFD simulation results of temperature.
Fig. 5 CFD simulation results of humidity.
The CFD simulation results show that CFD simulated model can meet the actual distribution.

Two equation models make a bulk of turbulence models used for CFD simulations.
Results and Discussion The results of CFD simulation shows typical fluid dynamics prediction in the perforated rotating bucket, where the fluid is forced to move the orifices at the bucket wall.
Velocity profiles at each plane is analyzed by CFD simulation.
(d) (c) (b) (a) Fig. 3 Velocity profile on different planes along horizontal axis Fig. 4 The average velocity at each orifice position by CFD simulation Conclusions In commercial application of perforated rotating bucket, velocity profile is very important for the design aspects or during operations.
Alamdari, Simulation of urea prilling process: An industrial case study.

Based on previous CFD models [14].
Same boundary conditions were applied for the fluid domain in CFD and FSI simulation.
RESULTS OF FSI SIMULATION The deformation of the UA boundary obtained from the FSI simulations is shown in Figure 3 for both with and without MAS fitted.
Tu, Simulation of Pharyngeal Airway Interaction with Air Flow Using Low-Re Turbulence Model.
Modelling and Simulation in Engineering, 2011. 2011

Numerical Simulation Research of An Ultra-micro Dispensing XU Ce1, a, ZHANG Qin1,b , Huang Weijun1,c and AOYAMA Hisayuki2,d 1 School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510641, China 2 Department of Mechanical Engineering & Intelligent Systems, University of Electro-Communications, Tokyo 182-8585, Japan axucescau2007@163.com, bzhangqin@scut.edu.cn, c huangwj@scut.edu.cn, daoyama@mce.uec.ac.jp Keywords: Ultra-micro dispensing, Micro-fluid, CFD simulation, Experimental verification Abstract.
A micro-fluid dynamics model is built using CFD (Computational Fluid Dynamics) software Fluent14.0 program, and the working process is dynamically simulated based on the model.
Therefore the numerical simulation with commercial CFD (computational fluid mechanics) software is a candidate approach to study the ultra-micro dispensing.
Numerical Simulation Governing Equations.
The axisymmetric grid model is built in GAMBIT software, and then imported into the CFD software Fluent14.0 program to for numerical computation.

As additional, Flynn and Sills [7] in CFD study emphasis on mesh size, time step, duration of simulation, and numbers of particles per size are the important variable.
Save on labor cost and time consumption as if used the CFD in a beginning stage of LEV development highlighted by C.S.
The objectives of this study the make a comparative study between design stage, experimental and simulation using computer simulation.
The different with outlet velocity for simulation and analytical is 18% where the outlet velocity for analytical 5.715 m/s and simulation 6.99 m/s.
A Study Of The Effectiveness Of Local Exhaust Ventilation (LEV) Using Computational Fluid Dynamics (CFD) Approach.

In flow separation region, there is different between CFD and experimental data, the flow attachment points of simulation result is far behind of experiment data, and the separation bubble length is greater than the experimental data.
In table 1, it shows the separation point and attachment point comparison between CFD method, experimental data and simulation results in reference [7].
As can be seen from the figure, the separation point position based on CFD method is agreed well with experiment data for minor error of less than 2%, but for the attachment point, the CFD method excessively predict more than 20%.
Further exploring CFD-based gust response and gust alleviation.
CFD Validation of Turbulent Separation Control on a 2D Hump (NASA Langley Workshop Validation: Case 3), AIAA 2005-5013

Design of Natural Ventilation and Analysis of Ventilation Safety in Commercial Building Jun Zhou1, a, Xiaohui Liu2 1Architecture and Art College, Shijiazhuang Tiedao University, Shijiazhuang, 050043, China 2 Department of Basic Teaching, Hebei Jiaotong Vocational and Technical College, Shijiazhuang, 050091, China Keywords: CFD Simulation; Cubic Function; Finite Volume; Commercial Building; Natural Ventilation; Contour Abstract: This paper establishes computer CFD simulation mathematical model of large commercial buildings according to the principle of cubic interpolation function and determines the cubic interpolation function based on triangular elements method.
It concludes the cubic polynomial in the process of simulation which improves the efficiency of computer simulation.
This paper introduces modeling process and flow diagram of simulation process of numerical simulation of natural ventilation simulation of commercial building.
Introduction With the increasing development of hardware and software of computer, numerical simulation technology has been widely applied to the construction industry and can achieved the CFD simulation of ventilation in building and got the ventilation and environmental parameter which provides technical support for building’s ventilation design[1].
Conclusion This paper established computer CFD simulation mathematical model of large commercial buildings and determined the cubic interpolation function triangular element function and concluded the cubic polynomial in the process of simulation which improved the efficiency of computer simulation.

CFD and FEA Simulation Goals of simulation.
Simulation Model Description.
The CFD model showing all components involved in analysis.
Plot of pressure generated from simulation results.
The current status of the simulation project is as follows: FEA models have been completed CFD models are being verified.

Aerodynamic Numerical Simulation in the Process of Car Styling Yingchao Zhang1,2,a, Zhe Zhang 1,2,b, Shuanghu Luo2 and Jianhua Tian2 1 State Key Laboratory of Automobile Dynamic Simulation, Jilin University, Changchun, China, 130022 2 College of Automotive Engineering, Jilin University, Changchun, China, 130022 a yingchao@jlu.edu.cn, bZhangzhejlu@tom.com Keywords: Aerodynamics, Computational fluid dynamics (CFD), Car body shape, Car styling virtual, Wind tunnel Abstract.
Some automotive aerodynamic numerical simulation based CFD is introduced in this paper named virtual wind tunnel test.
All the cells name meshes were export to CFD solve code.
It is a simple, effective, convenient and fast way to do aerodynamic nermerical simulation based CFD in the process of car styling.
Gao: Research on Local Parameterization Modeling of Concept Car Body and CFD Simulation (Ph.D., Jilin University, China 2008) (in Chinese)