Search results

Computations of Transient Flows and Sprays of Port Fuel Injector Yin congbo1, a, Zhang Zhendong1,b, Guo Hui2,c and Cheng Qiang1 1College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China 2College of Automobile Engineering, Shanghai University of Engineering Science, Shanghai 201620, China aemailyincong@tom.com, bzzhend@hotmail.com, c ghguohui@yahoo.com Keywords: Transient Flow; Port Fuel Injector; Spray; CFD simulation Abstract.
A CFD method was adopted to study the transient flow and spray characteristics of multiple nozzle holes port fuel injector.
The simulation is performed using the standard k-epsilon model.
Compared with the experiment results, the fuel flow rate is higher for simulation.
Spray Simulation Results Spray simulation was performed in a computational domain of 50 x 50 x 100 mm3.The size of cells is 1 mm.

He also performed CFD simulation of drosophila and compared his results with the dynamic model of drosophila constructed by Dickinson [5].
Figure 1 Schematic of experimental apparatus set-up Numerical Simulation.
Computational simulation was performed to investigate the flow characteristics and vortices structure around the coleoptera's wings using CFD commercial software ADINA-F [R].
Numerical Simulation.
The thin plate motion in the x and y coordinate used in the simulation are shown in figure 4.

It also presents theoretical simulation studies and actual studies on a real object, which enabled assessment of the propeller’s parameters.
Based on tests conducted on prototypes and simulations, a propeller in the form of a piston that is simultaneously a two-flap valve was proposed.
The CFD 1 line describes the analysis for ideal conditions, and the shape of CFD 2 was determined based on parameters measured on the actual object.
Distribution of water velocity in the propeller: ideal (CFD 1) and actual (CFD 2) Additional tests involving CFD analysis allowed presentation of pressure distribution in the propeller.
Figure 7 presents two specifications: in ideal (CFD 1) and in actual (CFD 2) conditions.

The issue was solved by computational fluid dynamics simulation.
This case study aims at application of CFD (computational fluid dynamics) simulation method in software ANSYS Fluent to determine optimal air distribution in the social hall of a restaurant facility.
Numerical simulations represent efficient tool for prediction of air flow.
Tab. 1: Heat and moisture gains of the social hall Heat gains – summer season 17.8kW Heat loss – winter season 6.2kW Moisture gains – summer season 31.6kg/h CFD model CFD simulations were carried out in software ANSYS Fluent.
Fifty years of CFD for room air distribution.

The Design and Analysis of Closed-coupled Exhaust Manifold Rangshu Xu 1, a, Xiangfeng Yan 2,b , Ling Niu 3 and Zhiwei Dong4 1 Shenyang Aerospace University, Shenyang, China, 110136 2 Shenyang Aerospace University, Shenyang, China, 110136 3 Shenyang Aerospace University, Shenyang, China, 110136 4 CNPC Jichai Power Equipment Company, Jinan, China, 250306 axurangshu@yahoo.com, byxfsdtc2010@163.com Keywords: exhaust gas; catalyst; numerical simulation; velocity distribution.
CFD method based on finite volume method is adopted to numerical simulate flow distribution in the entrance of closed-coupled catalytic converter and applying business software of FLUENT to clarity the flow uniformity of inlet to ensure catalytic converter work efficiently and meet regulations.
Yoshizawa, etc[1] through the comparison of experimental results and simulation results confirm the feasibility of computer simulation.
Soo-Jin Jeong[2] study inlet flow distribution of catalytic converter by CFD method to change the gap size distribution of catalytic converters in order to improve the conversion efficiency of catalytic converters.
In the studies the smoothly and uniformity of the internal combustion engine exhaust purification device by Xinghai Wang etc[3] and the flow field analysis and structural optimization of diesel engine exhaust manifold by Xianghua Li[11], CFD method were used to analysis the flow field.

CFD (Computational fluid dynamics) based on micro element is a powerful method for fluid analysis[1]-[3].
Preliminary Study on Seakeeping Capacity of Sailing Amphibious Vehicle Based on CFD [J].
Journal of System Simulation, 2009, 10:3142-3145
Simulation for Flow Field around Sailing Amphibious Vehicle [J].
Journal of System Simulation, 2007, 22:5130-5132

The Effects of Nozzle and Workpiece Placements on Cooling Rate in the Vacuum High-pressure Gas Quenching Furnace Based on CFD Zhijian Wang 1,a, Xiaoyan Wang1,b and Xiaofeng Shang 1,c 1School of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang Liaoning, China, 110136 awangzhijian1974@sina.com, b wlfn2005@163.com, cxfshang@vip.sohu.com Keywords: Vacuum high-pressure gas quenching, Cooling rate, CFD, Flow field, Temperature field.
From changing the structure and technology of nozzle-type vacuum high pressure gas quenching furnace, by a large number of computer simulation, this paper discusses some factors affecting the cooling rate.
The simulation results for the further development of new high-pressure gas quenching vacuum device provide a theoretical basis.
In this paper, to improve the efficiency of equipment, by the method CFD, how the structure of furnace chamber and arrangement of workpieces affect the quenching rate is studied.
It shows the simulation result of the velocity vector in Y = 0 section.

Advanced CFD technique is able to simulate the movement of particles in rotating machinery[6~7], then experimental data can prove the reliability of CFD methods[8~9].
Meanwhile the CFD methods associated with erosion model can successfully predict the fluid mechanical wear and tear.
This means that the computational model geometry during simulation was invariable.
Geometric model and meshes division of impeller Computational domain of three-dimensional geometric model is build by software ICEM CFD, as shown in Fig. 1.
In all simulations, computations were performed until the residuals of mean velocities, pressure and turbulence quantities were less than 1 × 10−3.

Spalart-Allmaras one-equation turbulent model was used for simulations.
CFD analysis of the low-speed aerodynamic characteristics of a UCAV.
M., "Navier-Stokes Simulation of Burst Vortex Flowfields for Fighter Aircraft at High Incidence,"Journal of Aircraft, Vol. 28, No. 10, 1991, pp. 638-645
Analysis of Delta Wing Vortical Substructures Using Detached-Eddy Simulation[J].
A., Development of a Common Research Model for Applied CFD Validation Studies.

The Application of Numerical Simulation Technology in the External Aerodynamic Noise Field of High-speed Train Zhengyu Zheng 1,2,a and Renxian Li 1,b 1 Chongqing University of Technology, Chongqing 400054, P.R.China 2 Southwest Jiaotong University, Chengdu, Sichuan Province 610031, P.R.China azhengzhengyu@126.com, brxli@home.swjtu.edu.cn Keywords: Vehicles-noise, Aeroacoustics, Lighthill-curle analogy, Large eddy simulation, Dipole source, Boundary element method Abstract.
This paper utilized the Boundary Element Method (BEM) combined with the Computational Fluid Dynamics (CFD) based on Lighthill’s analogy in the high-speed train model, and converted the fluctuating flow pressure near the vehicle’s surface into the dipole source boundary condition in acoustics grid, eventually succeeded in completing the numerical simulation of aerodynamic noise field outside the high-speed train by introducing the dipole source boundary condition into the train BEM model.
This paper utilized the Computational Aero-Acoustics (CAA) technology to the high-speed train flow model, and succeeded in getting the numerical simulation of aerodynamic noise field outside the high-speed train by introducing the dipole source boundary condition into the train’s BEM model.
Firstly, this paper utilizes the LES turbulence model in the CFD to simulate the external flow-field of the train at 270km/h, and obtain and export the fluctuating turbulence pressure data signals near the train’s surface meanwhile.
Fig. 11 Acoustics response at point01/02/03 (270km/h) Fig. 10 Acoustics response of point1/point2 (270km/h) Conclusions This paper utilizes the Boundary Element Method (BEM) combined with the Computational Fluid Dynamics (CFD) based on Lighthill’s analogy to the high-speed train flow model, and converts the fluctuating flow pressure near the vehicle’s surface into the dipole source boundary condition in acoustics grid, eventually succeeds in completing the numerical simulation of aerodynamic noise field outside the high-speed train by introducing the dipole source boundary condition into the train’s BEM model.