Search results

Three-dimensional Unsteady Simulation in a Water Turbine Ying Hu 1, a and Kun Wang1,b 1 Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology, Yunnan, China ahuyingtennis@hotmail.com, b 541756437@qq.com Keywords: Water turbine, Unsteady flow, 3D simulation, CFD Abstract.
This paper introduces the 3D numerical simulation of unsteady turbulent flow in the entire flow passage of a water turbine model with CFD technology.
The 3D unsteady turbulent flow in an entire Francis turbine model is simulated using the latest CFD technique and the full-implicit multi-grid method.
Automated simulation of flapper and foil system.
Large eddy simulation of turbulent flow downstream of a backward-facing step.

A 3D engine simulation shows differences in swirl motion and turbulence between the original symmetric valve lift profile and the DVL.
The CFD simulation was focused on 4000 rpm as the engine speed was tested for the best efficiency and BSFC while maintaining power.
The simulation was used to test the transient effects of the valve lift created by the DVL movement.
A flame speed propagation analysis was done to estimate how slow the real flame speed is when compared to the simulation flame speed.
The validated simulation can be use to test the actual engine for modifications without using the actual engine.

Journal of Ship Mechanics Vol. 3 (1998), p. 74 [2] Cai Rongquan: Current situation of ship CFD and our knowledge.
Shanghai, China (2010) [13] LIU Chong-yang, YU Fang and XU Rang-shu: A grid error analysis example in CFD.
Journal of Shenyang Institute of Aeronautical Engineering Vol. 23 (2006), p. 21 [14] KANG Shun, SHI Lei, DAI Li-Ping, FAN Zhong-Yao: Analyse of CFD simulation error and study of grid convergence.
Flight Dynamics Vol. 27 (2009), p. 87 [16] Ming Pingjian, Zhang Wenping and Zhu Minggang: New AMG Method and Application in CFD.
The 4th International Symposium on HVAC, Beijing, China (2003) [22] Fred Stern, Robert V W, Hugh W C, et al, in: Verification and validation of CFD simulations.

Finally, the influence of the front wing and rear wing on the whole vehicle will be evaluated through CFD simulation.
The paper is mainly focused on the computer-aided design based on CFD simulation, and when the program is finished, a more comprehensive study including wind tunnel test and track test results will be presented.
A comparative simulation result regarding flow separation is presented in Fig. 1(a) and Fig. 1(b).
Fig. 6: Full car CFD streamlines for the 2011 vehicle Tab. 4: CFD analysis results of 3D full car.
E., Bahaj, A.S.: Comparison between CFD simulations and experiments for predicting the far wake of horizontal axis tidal turbines, Sustainable Energy Res.

Through CFD simulation computation and practical measuring tests of above three parameters for practical muffler with complex configurations, the mathematical relation of them was proved to be correct.
With the development of computer technique, CFD method was becoming to a valid method for studying pressure loss of mufflers [1-3], which proved the validity of CFD method in muffler simulation research.
CFD Simulation Analysis on Typical Resistance Mufflers In this paper, typical resistance mufflers included typical expanding muffler, insert-pipe muffler and perforated pipe muffler.
[3] Hu X D, Zhou Y Q, Fang J H, et al, Muffler Structure Optimization Research of Digging Machine Based on CFD, Journal of System Simulation. 13(2007)3126-3129
[4] Fang J H, Zhou Y Q, Hu X D, et al, CFD Simulation of Exhaust Muffler with Complicated Structures for an Excavator, Transaction s of CSICE. 1(2009)68-73

Fig . 1　Structure of the proportional control valve Flow Field Simulation of Proportional Control Valve According to the design proportional control valve, 3D fluid model was established in the ANSYS CFD.
Numerical Simulation Results.
(2) It uses CFD simulation and study the pressure distribution of Internal flow field of proportional control valve , which discusses flow through the valve at various different pressure ,acquires verified test results
Development of multibody dynamics simulation tool for tracked vehicles[J].
Stellar Fluid Dynamics and Numerical Simulations, Vol.41 (2006),p. 43 [7] Gimbun J.

The Design and Numerical Simulation of Continuous Diffusion Furnace’s Gas-inlet Tube Guiqin Li1,a*, Zhiping Yu2,b, Shengcai Zhang3,c, Xiao Yuan4,d, Hongbo Li5,e 123Shanghai Key Laboratory of Intelligent Manufacturing and Robotics, Shanghai University, Shanghai, China 45East China University of Science and Technology, Shanghai, China aleeching@shu.edu.cn, byuzhiping0814@126.com, csam1202011@163.com, dyuanxiao@ecust.edu.cn, elihongbo@ecust.edu.cn Keywords: gas-inlet tube, variable spacing, CFD, simulation Abstract.
The gas velocity in the furnace tube is simulated by CFD, and its feasibility is verified.
The results are simulated by CFD method and proved to be reasonable.
Taiyangneng Xuebao, 34(6):1021-1027 [4].Ibrahim,M.2-D CFD simulation of the heat transfer and fluid dynamics in an experimental model of the hot end of a stirling engine.Energtech,2012,pp.1-11 [5].Lu Lixin, Li Guiqin, Jin Guojun, Sun Yi.
Simulation of the effect of power on the properties of Si-based films deposited by PECVD[J].

Numerical Simulation of Thermal Plasma Gasification Process Sooseok Choi Department of Nuclear and Energy Engineering, Jeju National University,102 Jejudaehak-ro, Jeju-si 690-756, Jeju Special Self-Governing Province, Republic of Korea sooseok@jejunu.ac.kr Keywords: Thermal plasma, Gasification, Numerical analysis, Magnetohydrodynamics (MHD), Computational fluid dynamics (CFD).
Numerical analysis of plasma gasification process was carried out base on the combination of magnetohydrodynamics (MHD) and computational fluid dynamics (CFD).
The numerical simulation was conducted in two steps.
In addition to plasma inlet boundary, the inflow of decomposed gas into the plasma reactor was also accounted as the inlet boundary condition in the CFD simulation.
In order to account transport coefficients of working gases in high temperature [16], a user defined function was incorporated in the CFD code.

CFD simulations can provide useful guidelines for obtain the rate of recovery in outlets, which is of interest to the design of hydrocyclones with performance desired.
Air Core Simulation.
Other simulations were done in an attempt to establish air core in this device.
The profile is more clearly defined for simulation LES, Fig.°4 (b).
Results of Simulations in Presence of Air Core.

Numerical Simulation of Low Reynolds Number Flows based on CFD Yan-ping ZHAO1, a,Dong-li MA1AND Yu-hang QIAO1 1School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China ayanpingzhao@ase.buaa.edu.cn Keywords:low-Reynolds number; numerical simulation; transition model; flow analysis.
Simulation results show good agreement with the experimental data.
CFD was useful where low Reynolds number flows are too difficult to investigate experimentally.
In this paper, numerical simulation of low Reynolds number flows around Eppler387 airfoil was carried out using improved RANS equations based on CFD.
Transition SST model was demonstrated and used for the simulation of flows around Eppler387 airfoil based on CFD.