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The Performance Simulation and Optimization Research on Intake Port of Locomotive Diesel Engine CUI Hongjiang, LI Minghai and GUAN Ying School of Traffic and Transportation, Dalian Jiaotong University, Dalian, Liaoning Province, China randycui@163.com Keywords:diesel engine; intake port; CFD Abstract.In order to manufacture high quality intake port with bigger discharge coefficient and appropriate swirl ratio for diesel engine performance improvement, intake port tests and CFD simulation method were combined together to optimize its structure.
The three-dimensional CAD model of intake port was built and was putted into AVL–FIRE platform to do CFD simulation with appropriate turbulence model and calculation method.
The detailed air flow information was obtained by CFD simulation.
This research shows that CFD simulation is a powerful method to design diesel engine intake port; air flow condition is complex in the intake port; intake port structure optimization can increase the discharge coefficient and improve the air flow condition.
The intake port simulation analysis is always regarded as an adiabatic question.

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.

Some studies on the fluid flow in the gap and the simulations were conducted for die-sinking EDM [3]-[5].
The CFD simulations presented in this study are performed with the commercial STAR-CD and STAR-CCM+.
The simulations of fluid flow were done by a finite volume method as a three dimensional, unsteady laminar and turbulent flow [6].
Comparison of machined surface and analyzed result under various workpiece thickness c In order to verify the CFD simulation results, wire EDM experiments were also carried out under the same jet conditions as in the CFD simulation.
[4] Han F, Kunieda M, Sendai T, Imai Y, High precision simulation of WEDM using parametric programming, Ann.

Numerical simulations show the best observation direction is the 90 o angle between the main optics axis and the horizontal line in which the air velocity distribution is the least.
In the past，Computational Fluid Dynamic (CFD) could be used only for simple geometries and flows with limited turbulent content.
Moreover, the CFD software Ansys CFX directly adopts the Solidworks kernel geometry eliminating errors induced by geometry translations.
With the CFD software calculations, the effects of varying the telescope elevation fromα=80 o toα =120 o on the velocity are captured in Fig. 3.
In this article, the natural convection has been analyzed by using the CFD software to evaluate the temperature distribution of air around telescope.

Simulation of viscous flow around surface ship using ANSYS-Fluent CFD code Shu-ling CHEN1,a and Song-lin YANG1,b 1School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China achen_shu_ling@hotmail.com, bysl560516@vip.163.com Keywords: Hydrodynamic characters, Wigley hull, Numerical simulation.
Numerical Models FLUENT CFD code.
This is a general-purposed CFD code that has been applied to a broad range of disciplines.
The mesh can consist of elements in shapes such as quadrilaterals and triangles for 2-D simulations and hexahedra, tetrahedra, prisms and pyramids for 3-D simulations.
The ANSYS CFD-Post software is used to post-process its results in several formats including images and flow animations.

Such numerical simulation technology is called computational fluid dynamics (CFD) (Fig. 2) [6].
However, in recent years, the CFD technology has been applied to the simulation of building environments.
Fig. 6 is a simplified CFD simulation model in the district.
Chan, CFD analysis and energy simulation of a gymnasium.
Ye, CFD Simulation Research on Residential Indoor Air Quality, Sci.

Numerical Simulation of Rocket Nozzle Srinivas G1, Potti Srinivasa Rao2 1Department of Aeronautical & Automobile Engineering, MIT- Manipal University, Udupi, Karnataka, INDIA - 576104. 2Department of Humanities & Management Engineering, MIT- Manipal University, Udupi, Karnataka, INDIA – 576104. 1srinivasle06@gmail.com, 2srinivasapotty@yahoo.co.in Keywords: Nozzle, Pressure distribution, CFD, Inlet , Exit.
After the simulation the results revealed that the divergence angle varies the mach number and other performance parameters also varies.
[3] Nathan Spotts et al “A CFD analysis of compressible flow through convergent-conical nozzles” American Institute of Aeronautics and Astronautics.
[4] Pandey,K.M.; Singh, A.P.; CFD Analysis of Conical Nozzle for Mach 3 at Various Angles of Divergence with Fluent Software, International Journal of Chemical Engineering and Applications, Vol. 1, No. 2, August 2010, ISSN: 2010-0221.
Srinivasa Master of Science Aerospace Engineering report “CFD Modeling and Analysis of an Arc-jet facility using ANSYS Fluent” May 2012.

Based on these advantages the paper using CFD knowledge and the FLUENT software, using RSM turbulence model, SIMPLE algorithm, simulation class D landform, to have numerical simulation of average wind pressure coefficient for of the circular planar and saddle roof building (GB50009—2001,2006.)
CFD Numerical Simulation Control equations.
(Zhou2009).In this paper, the numerical simulation of selected RSM model.
Figuer 4 The mean wind pressure coefficient distribution of circular plane saddle roof surface (zero degrees wind angle) Conclusions CFD numerical simulation technology is a new research method, for the study of mean wind pressure distribution of complex building surface provides a convenient, fast, low-cost ways.
[5] Wang, F.J., Computational fluid dynamics analysis of CFD software theory and application [M].

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.

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.