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Numerical simulation of cavitating turbulent flow in a Francis turbine with draft tube natural air admission Hongming ZHANG 1, a, Lixiang ZHANG 1,b 1 Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming 650500, P.R.China ahmzhang8888@126.com, bzlxzcc@126.com Keywords: CFD; cavitating turbulent flow; air admission; Francis turbine; OpenFOAM.
OpenFOAM is an object-oriented C++ library of classes and routines of use for writing CFD codes.
It has a set of basic features similar to any commercial CFD solver, such as turbulence models and discretization schemes.
It is increasingly being used in the numerical simulation of hydraulic machinery.
SIMULATING CAVITATING FLOWS WITH LES IN OPENFOAM, V European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010, J.

With the tremendous development of computing technologies, CFD tools have become more and more affordable.
Now development of CFD modeling and availability of low cost and high speed computers have allowed performing three-dimensional simulations of complex multiphase flows in flotation column.
So the choice of turbulence models is the k-ε model in our study on CFD simulation of flotation column flows.
Results and analysis of numerical simulation Jet aerator Here are the numerical simulation results of the jet aerator.
Joshi, CFD simulations of bubble column reactors: 1D, 2D and 3D approach, Chemical Engineering Science. 60 (2005) 6733-6746

Calculating navier-stokes equation to study oil film pressure characteristics of three oil wedge bearing by using CFD software.
Only reasonable mesh can do guarantee the simulation result is close to the real oil film properties.
They are basically the same trend that explain the numerical simulation method is correct and feasible.
Fig. 3 Film pressure of bearing cylindrical along peripheral direction Numerical simulation results of three oil wedge bearing characteristics.
The simulation results has been shown as figure 4.

The Performance Simulation of One-way Inlet Valve of Reflux Scavenging Free Piston Engine ZhenXin Li1, a, ZhaoCheng Yuan1,b, JiaYi Ma1,c , ShiYu Li1, d 1 State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China alizhenxin747@163.com, b yuanzc0528@126.com, c yijiama@126.com, d wei6811607@163.com Keywords: One-way inlet valve, CFD, Free piston engine, Reflux Scavenging Abstract.
The displacement –time relationship of piston was made into the data table, which was imported the CFD for simulation.
The lift of valve In the CFD software, we can define the piston as the moving object and the movement law by importing previously obtained data table.
Simulation of a Two-Stroke Free Piston Engine.
Performance Simulation of a Compression Ignition Free Piston Engine.

Chip characterization and COMSOL CFD.
The characterization of chip depends on CFD and COMSOL CFD in this study.
Results and discussion COMSOL CFD result.
The simulation results are shown in Fig.4.
Fig .4 Result of COMSOL simulation.

Using Fluent software on the horizontal axis wind turbine numerical simulation, analysis of the United States of America S809NREL airfoil aerodynamic characteristics of different angles of attack numerical simulation, analyzes the different angles of attack in the vicinity of the pressure, velocity distribution.
Wind tunnel test study on time-consuming, costly, and with the development of computer technology as well as the turbulence model is ceaseless and perfect, the application of computational fluid dynamics ( CFD ) numerical method research of wind turbine airfoil aerodynamic performance has become the important way and development trend.
CFD numerical simulation to describe complex geometry boundary and flow structure, and in the early design quickly and improve design performance evaluation, performance optimization and save time, save money, greatly reducing the risk posed by new design[1].
Therefore, in recent years on airfoil aerodynamic performance testing more application CFD numerical simulation[2].
This paper uses the CFD software Fluent analysis of the United States of America S809NREL airfoil aerodynamic characteristics of different angles of attack numerical simulation, analyzes the different angles of attack in the vicinity of the pressure, velocity distribution.。

Application of CFD flow analysis software and the SIMPLE algorithm described viscous flow field within the three-dimensional centrifugal fan.
By comparing simulation data with calculated data, optimize the turbine design.
In addition, the most critical characteristic is that the software can generate files directly for CFD calculation, which greatly simplifies the calculation of the fluent pre-processing.
At the last, the software CFD is used for the simulation of the model.
[3] Xie Dan,Chu Wuli: Computer Simulation,4(2009)344~347

Taeyeon Kim et al. (2009) assessed pedestrian wind comfort based on a wind tunnel experiment and CFD simulation analysis. [7]; Jian Hang et al. (2013) proved that semi-open street roof is better able to offer pedestrian space compared to no-covered and fully-covered roofs based on CFD simulation analysis on five semi-open roof with different covering sizes.
Up until now, there’s no study in arcade based on a combination of field measurement and CFD simulation analysis.
CFD Numerical Simulation Analysis.
Fig. 5 show the comparing results of both field measurement and CFD numerical simulation, which present similar trends, the reliability of CFD numerical simulation method can be proved.
Fig. 5 (a) Wind velocity results compare of field measurement and CFD simulation (b) Wind velocity by CFD Table 4 CFD Numerical simulation Analysis of three cases.

The computation fluid dynamics (CFD) software is applied to simulate the multi-phase oil mist flow in control box.
This paper applies CFD software, FLUENT, to numerical simulation of oil mist process, and analyzes the varying laws of pressure and velocity of oil mist in main control box, and how the different entering positions effect the oil mist treatment.
Numerical Simulation.
With the numerical simulation method mentioned above, the control box is solved and simulated.
Wang: Computational Fluid Dynamics——Principle and Application of CFD Software (Tsinghua University Press, China 2004)

Modeling of natural ventilation in solar chimney and optimization of the channel profile by CFD method Yaxin Sua, Feining Lei, Yufeng Xue School of Environmental Science & Engineering, Donghua University, Shanghai 201620,China a suyx@dhu.edu.cn Keywords: natural ventilation, solar chimney, numerical simulation, chimney structure Abstract.
Results Comparison of CFD results with experimental data.
The maximum error between the CFD and tested results was less than 13%.
In general, the present CFD could provide a reasonable calculation results.
In order to study the effect of solar chimney height on induced air flow rate and flow pattern, the CFD simulation was carried out for the chimney with the following sizes: length of 1m, width of 0.7m and height of 0.7- 6.3m.