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Along with the development of fluid dynamics research, it is feasible and has obvious advantages to adopt simulation study with the CFD simulation software for attrition of sewage pump.
Model parameter of centrifugal sewage pump The paper took type of 50W15 centrifugal sewage pumps as research object for simulation.
Simulation results and analysis The simulation was done under different working condition with different particle size which diameter is from 1mm, 2mm, 3mm, 4mm and 5mm, and different granule concentration which is 1%,2%,3% and 4%.
Simulation results show that wear degree is not uniform in different part of impeller.
[3]Fu-jun Wang: in:Computational fluid dynamics (CFD) software analysis: principles and applications.

To obtain the design criterion ofcurve regression equations and area ratio,Wan Peisun conducted tests on the jet-mixing apparatus and discussed the relationship between its structure parameters[2].He Peijie chose different jet nozzle diameters and different jet nozzle distances and some other parameters to determine the pressure ratio and the flow ratio of jet-mixing apparatus[3].To analyze and compare the mixing performance of different kinds of jet mixing apparatus, Xu Youlin designed 4 forms of jet-mixing apparatus and carried out numerical simulation by using CFD software Fluent flow[4].Meanwhile.Qiu Baijing studied pipe distance, area ratio and inlet angle on the effects of mixing performance of the mixing device by CFD, he obtained some rules between the three structural parameters and the jet mixing properties[5].
At present, the research on jet mixing was limited to the flow field simulation of jet mixing apparatus and experimental analysis, but the jet-mixing device and spray system to integrate a large system for the research didn’t be taken.Therefore, this text studies working state of jet mixing apparatus used in spray system based on the bench test. 1 Working state of jet-mixing apparatus 1.1 The structure and parameters of jet-mixing apparatus A jet-mixing apparatus is mainly composed of jet nozzle, medicine sucking mouth, suction chamber, mixing tube and diffusion tube, its structure is schematically shown in figure1.And the structural parameters of jet-mixing apparatus could be divided into fixed parameters and variable parameters, fixed parameter is a constant parameter in the optimization design and variable parameter refers to changing parameters values in order to explore an optimized parameter in the effects of flow jet to jet-mixing apparatus in simulation design.
The apparatus may appears reflux and cavitation that are thought as failed condition, to avoid back flow and cavitation state, the current research on reflux state of jet-mixing apparatus is less, this paper will study the working state of the jet-mixing apparatus from numerical simulation and experimental study. 2 Bench test 2.1 The bench test device The main parts of the test device are: online mixing test platform, it consists of dynamic liquid pump, water tank, pesticide tank, jet mixer, spraying system and the measuring elements, the structure and the test bench of online automatic mixing test platform are both shown in figure 2.
[4] Xu Youlin,Zhou Fengfang,Guo Jingkun.Flow Field Simulation of Chemical Mixing Process for Direct Injection System based on CFD[C].2008:ASABE International Meeting,Rhode [5] Qiu Baijing,Xu Xichao,Yang Ning.The simulation analysis of the influence of structure paraments on the mixing performance of jet mixing device[J],Transaction of the Chinese Society for Agricultural Machinery,2011, 42(6): 172~174.

One of the alternative method in CFD is the lattice Boltzmann method.
Unlike the traditional CFD methods, which solve the conservation equations of macroscopic properties (i.e.
The excellent match of the present results with the present study demonstrate it validity for the simulation.
Dass, Simulation of Incompressible flows in two-sided lid-driven square cavities.
Part I – FDM, CFD Letters. 2 (2010) 1-12

While adhesion of airborne sea salt particles to bridge structures are simulated locally by a CFD analysis, the large scale analysis yields a boundary conditions of the local analysis and is given by a part of a mesoscale meteorological analysis.
In the local analysis (representative length scale is about 102m), adhesion of airborne particles is simulated by two phase flow analysis using computational fluid dynamics (CFD) (See [1,2] for details).
Fig. 3 illustrates an example of the simulation of adhesion of airborne particles to a bridge girder [1].　　
Therefore, WRF/Chem can provide reasonable boundary and initial conditions for elaborate local analyses based on CFD in these areas.
Goto, (2008) Numerical simulation of sea salt particulate matter adhesion on bridge surfaces by two-phase flow analysis, J.

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.

In this paper, by the way of numerical simulation, the ground surface temperature field and indoor air temperature field of three different types of floor radiant system are compared using the CFD software FLUENT.
Then the CFD software FLUENT is used to get the numerical calculation result, which can also processed by the software.
Conclusions The temperature in the simulation process in this paper is a little higher.
Piippo, Uneven gridding of thermal nodal networks in floor heating simulations, Energy and Buildings 39 (2007) 1107–1114
Simulation analysis on the impact of coverings on floor heating [J].

A self-priming process was numerically simulated in a diffuser element using a computational fluid dynamics program (CFD-ACE+).
Diffuser Simulation The computational fluid dynamics (CFD) simulations show the passive valve effect of the diffuser elements with a high degree of accuracy [7].
Numerical analysis was performed for a diffuser element in the fabricated valveless micropump using the commercial program (CFD-ACE+).
The simulations were done using water as liquid at 300K and based on the Navier-Stokes equation.
The simulation results predict minimal bubble generations at the hydrophilic surface and rapid flow rate at the hydrophobic surface.

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)