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The water pressure on the blade in the flow fields of different operating conditions is calculated by means of CFD software CFX.
R Xiao. etc. [1-2] calculated the flow field of the Francis turbine through the whole passage by CFD and concluded the linear relation between the maximum static stress of the runner and the power of the turbine by ordered fluid-solid coupling.
This paper does CFD calculations on the various conditions of design head through the whole passage of a certain Francis turbine in the northeastern China with the help of CFX and ansys workbench.
(a) Stay ring (b) Runner Fig.2 Grid of each part in calculation domain 1.4 boundary conditions The numerical simulation is finished with CFX.
This paper adopts the modeling software UG to do solid modeling for all the flow passage components of the Francis turbine through the whole passage and does three-dimensional numerical simulations on the Francis turbine through the whole passage by CFD.

Simulation and analysis for cooling system of high-speed motorized spindle LEI Chun-li1, a, RUI Zhi-yuan2,b and ZHOU Yin-cheng3,c (1.Key Laboratory of Digital Manufacturing Technology and Application, The Ministry of Education, Lanzhou University of Technology; 2.School of Mechanical &Electronic Engineering, Lanzhou University of Technology, Lanzhou 730050, China, alclyq2004@163.com, bzhiy_rui@163.com, c376125389@qq.com) Keywords: high-speed motorized spindle; cooling system; heat transfer; CFD Abstract.
A general applicable method for simulation of the fluid state and the thermal distribution was applied based on the software of ANSYS CFX by Chen[9]。
The three-dimensional simulation model of motorized spindle with cooling system was established.
Mesh generation is a vital stage in CFX simulation analysis.
In this article, the CFD mesh generation style was adapted, because fluid region can be divided from solid field in this generation style.

It performs simulations of flow inside the valve at different times in the dynamic action of opening and closing, which derive values disc forces and tensions variation in shaft.
Lin also modeled a 3.66 meter diameter butterfly valve within a pipe at valve openings of 20, 40, 50, 60, 70, 80, and 90 degrees with cavitations free conditions and incompressible flow using CFD [14].
For getting all simulations Flow simulation program and Mechanical simulation was used.
Wu, Numerical Simulation Butterfly Valve Fluid Flow, Proceedings of the FLUENT User’s Group Meeting (Burlington, Vermont, 5-7 October 1993) pp. 296-13, (1992)
Schohl, CFD Prediction and Validation of butterfly Valve Hydrodynamic Forces, Proceedings of the World Water and Environmental Resources Congress, pp. 1-8, (2004)

Recently, the numerical simulation method based on CFD has been widely used in researches on design of air distribution of gymnasium-typed constructions with large space.
The CFD method is economic, flexible, highly efficient and rapid and with development of computer hardware it has already become popular in recent years.
CFD can simulate real conditions, so it can guide design and analyze design issues conveniently and effectively and there already have been some successful cases at home and abroad.
In terms of practical calculation of CFD, reasonable adoption of the CFD method can get the design results of flow field in large space that fit the results gotten by actual measurement.
As a result, the CFD method is supposed to be our right choice.

Shah et al. [5] and M.W Heo et al.[6] have successfully designed and analyzed centrifugal pumps or its subcomponents using CFD techniques and available softwares.
Kapil Pandya et al. [7] carried out a similar CFD analysis of centrifugal pump impeller.
The various stages of simulation processes have been shown in Figure 3.
(a) (b) (c) (d) (e) Figure 3: The various stages of design and simulation process.
Thakkar and Pragnesh K Brahmbhatt, Experimental and CFD analysis of Centrifugal Pump Impeller- A Case Study, IJERT, Vol. 2, Issue 6 (2013) [2] S.M.

From the information cited above, this work aims to study the separation process of oily water using ceramic membrane by CFD.
Figure 1 - Geometric representation of the tubular membrane and transverse 2D plane used in the simulations.
For numerical simulation, one mesh was generated using ICEM CFD software, as shown in Figure 3.
Table 5 - Parameters considered fixed in the simulations.
Fouladitajar, CFD modeling and simulation of concentration polarization in microfiltration of oil-water emulsions; Application of an Eulerian multiphase model, Desalination. 324(2013) 37-47

Study of Distribution and Quantification of Flammable Gas in Confined Space Ales Tulach1, a, Miroslav Mynarz 2,b * and Milada Kozubkova 3,c 1VSB – Technical University of Ostrava, Faculty of Safety Engineering, Department of Fire Protection, Lumirova 630/13, Ostrava - Vyskovice, 700 30, The Czech Republic 2VSB – Technical University of Ostrava, Faculty of Safety Engineering, Department of Fire Protection, Lumirova 630/13, Ostrava - Vyskovice, 700 30, The Czech Republic 3VSB – Technical University of Ostrava, Faculty of Mechanical Engineering, Department of Hydromechanics and Hydraulic Equipment, 17.listopadu 15/2172, Ostrava - Poruba, 708 33,The Czech Republic aales.tulach@vsb.cz, bmiroslav.mynarz@vsb.cz, cmilada.kozubkova@vsb.cz Keywords: gas leak, CFD models, explosive concentration, gas distribution Abstract.
Mathematical CFD models provide broad overview of spreading of natural gas, in dependence on the elapsed time from the start of leakage.
Today, number of specialized software for simulation of these effects exists.
Besides these products, very sophisticated programs for advanced simulations of flow can be used that are able to solve the processes associated with chemical reactions and heat transfer.
ANSYS Fluent software used for simulations in this contribution also belongs to such products.

At present time, FLUENT is one of the best modern CFD software which can be used to simulate the inner flow filed of nozzle.
Establishment of the Numerical Model and Simulation of the Inner Flow Field of Hema-Type ATY Nozzle Establishment of the Numerical Model.
Simulation of the Inner Flow Field of Hema-Type ATY Nozzle.
All the residual values are within 10-3 when the number of the iterations reaches 325.So the simulation are completed and the results are correct.
One Validation Case of the CFD Software Fluent: Part of the Development Effort of a new Reactor Analysis Tool[C]//International Conference on Nuclear Engineering, Proceedings, ICONE, P913-919. (2002) [3] Liang Zhao.

To simulate the complex flow phenomenon of synthetic jets, the commercial computational fluid dynamics (CFD) code ACE+ ® was used for numerical calculations [6].
Theoretical Model Simulations using CFD software ACE+ ® were conducted to explore the flow structure of synthetic jets.
The maximum error between the predictions and the experimental results was well within 3.21%, indicating that the simulation software can predict synthetic jets with an adequately accuracy.
Numerical calculations were also conducted to examine various effects (including the driving voltage, relative phase delay of frequency, slot width, and cavity depth) on jet performance under pre-specified simulation conditions.
Spall: Physics of Fluids Vol. 17-4 (2005) 045103 [6] ESI US R&D 2004 CFD-ACE(U) ® V2004 User's Manual ESI-CFD Inc., Huntsville, AL.

Greet agreement of diameter changing tendency was found in simulation and experiment.
However, the computer fluidic dynamic (CFD) method compensates the shortcoming of experiment process.
A typical co-flowing model used in the computational fluid dynamics (CFD) was created which was composed of two cylinder tubes, showed in Fig.1.
A typical dripping formation of droplets was processed in simulation and experiment.
This relationship was also found in numerical simulation, showed in Fig. 4b.