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Study on the Influence of the Quantity of Grooves on Performance of New Balance Drum Lu Hequana, Mu Jiegangb, Zheng Shuihuac, Zhao Jinjingd, Wang Huie College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China aluhe52@126.com, bmjg1963@126.com, czneu@zjut.edu.cn, dzjjasp@126.com, e467094560@qq.com Keywords: multistage centrifugal pump, axial force, balance drum, clearance leakage, numerical simulation Abstract: A new type of balance drum with grooves was presented, and analyzed the influence of quantity of grooves on performance of centrifugal pump and balance force by the method of numerical simulation and experiment.
After that, we can study the three models by CFD software and experiments of model machine, and compare the results that achieved by the numerical simulations and experiments.
Table 2 The result of numerical simulations of the three programs Quantity of groove N 8 12 16 Leakage losses qv [m3/h] 6.624 5.764 4.583 Differential pressure ΔP [Mpa] 2.759 2.790 2.832 Experimental study Test equipment.
Application of CFD to turbulent flow analysis and performance prediction in hydraulic machinery [J].
Numerical simulation of the dynamic effects due to impeller-volute interaction in a centrifugal pump [J].

And as the development of the CFD (Computational Fluid Dynamics) and the corresponding algorithm software, it is possible to study the microbubble generators by the method of numerical simulation.
The solution procedure of the CFD Fig. 2.
The Microcel flotation column When the method of CFD is applied in the area of the fluid calculation, the elements of the fluid flowing will be researched, such as full-field velocity, pressure distribution, etc..
With CFD, the total capacity of the fluid equipments can be forecasted, and the design issues of the equipments can be found by the analysis.
The solution procedure of the CFD can be shown in the Fig. 1.

Numerical Simulation of Effect on Billet Casting Q235 under Inner-out Cooler Lang Li1,a and Guoping Chen2,b 1School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan ,621010,China 2School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan ,621010,China alilang@mail.ustc.edu.cn, bchenguoping@swust.edu.cn Keywords: billet, inner cooler, flow field, temperature field, numerical Simulation.
With the help of Fluent -a kind of CFD business soft ware, a numerical simulation is undertaken to testify the condition of the molten steel in the inner-outer cooling mould coupled by flow field and temperature field.
Math-phy Model[2~4] and simulation conditions Governing Equations Conservation of mass equation (1) Conservation of momentum equation (2) Energy equation
Numerical simulation and results The size of the mould is 165mm×165 mm,with 800mm long and 10mm thick of the wall.The inlet diameter is 96mm,the outlet 30mm,and the immersing depth is 150mm.And the inner cooler is made of pure copper with the shape of U,which is 340mm high with the bent radius of 54mm and the immersing depth of 200mm.Besides,the casting depth of molten steel is 200mm;the pull velocity is 1.2m/min.Thermophysical Properties are listed in Table .1.
References [1] XiaochaoCui,ZicaiLiu,JingSong and YouhongWang .Numeric Simulation of Three Dimensional Flow Field of Molten Steel in a Mould with High Efficiency Inner and Outer CoupleCooling.SPECIAL STEEL. 2005.vol.26 No.1 p.9-11 [J].

Taking the air intake pipe in the engine as the target of the research, the software STAR-CDE is adopted to build a three-dimensional simulation model for the air intake pipe in the engine T12V190 with the aim to solve the problems of air input deficiency, Combustion deterioration and performance reduction of one cylinder caused by the non-uniformity.
Moreover, the non-uniformity of the flux of air intake of the air intake pipe is mainly studied and analyzed through a calculation on the CFD of the inner flow field of the three dimension of the air intake pipe in the engine T12V190.
In this paper, taking the STAR-CD V3.26.059 (abbreviated as STAR-CD in the following) and Fortran as the tools software, correlative modules of STAR-CD are adopted to complete the partitioning of lattice, enactment and derivation of the boundary condition and initial condition, and Fortran is used to be the user program to control the turn-on and cut-off of the each outlet, through a calculation on the CFD of the inner flow field of the three dimension of the air intake pipe in the engine T12V190.
Engine intake flow simulation and optimization [J].Chinese Internal Combustion Engine Engineering, 2005, 26(4) page: 12-15
Application of CFD / CAD technology to optimize the design of diesel engine intake pipe [J].

Developing the virtual experiment software by applying modern Computational Fluid Dynamics(CFD)[3] and computer technologies, letting students carry on experiments under virtual circumstances, is an effectual approach to solve the problem above.
In this paper, taking Mensurate Airfoil Pressure Distribution virtual experiment [4] as an example, the design and implementation of virtual experiment, the numerical simulation method were introduced.
Brief introduction to numerical simulation method Control equation.
As the study on airfoil pressure distribution cannot ignore the viscosity of air, so in numerical simulation three-dimensional N-S equation which includes viscous items was used as the control equation
The Role of Computer Simulation Experiments in Physics Experiments Teaching.

Simulation of Solid Particles in Combined Conduction, Convection and Radiation Gas Flow over a Backward-facing Step in a Duct Vahid Golkarfard, Prof.
A numerical simulation procedure for studying deposition of aerosol particles in a laminar convection flow of radiating gas over a backward-facing step including the effect of thermal force is developed.
Two dimensional Navier-Stokes and energy equations are solved using CFD techniques, while the radiating transfer equation (RTE) is solved by discrete ordinate method (DOM) for calculating radiative heat flux distribution.
The set of governing equations including the conservations of mass, momentum and energy is solved numerically by the CFD technique.
Gravity, thermophoresis, Brownian, lift and drag forces are considered in the particle simulations.

The aerodynamic load is determined using a computational fluid dynamics (CFD) software.
The simulation is done in the rated wind-speed of 10 m/s.
Fig. 3 Flowchart of the design process CFD Simulation of Wind Turbine Aerodynamic Loads The simulation is done in the rated wind-speed of 10 m/s in order to obtain the aerodynamic load.
The result obtained from CFD simulation is total pressure.
This condition eases the matching process between CFD and FEM models.

To test the benefit of natural ventilation system, this paper reviewed some analysis that had used simulation software such as CFD.
Nugroho et al (2007) supported the CFD thermal model, an acceptable airspeed is needed to get the required thermal comfort.
Therefore, to check the effectiveness of the natural ventilating system, this paper studied some analysis that had used simulation software like CFD.

Possibilities of simulations in the planning of the retrofit of historical double skin windows Dániel Bakonyi1, a, Gábor Becker2,b 1,2Budapest University of Technology and Economics, Faculty of Architecture, Department of Building Constructions, 1111 Budapest, Műegyetem rkp. 3.
Figure 2 Isotherm plots for an IG unit (left) and the glazing of a double skin window (right) for typical winter boundary conditions (Te=0[°C], Ti=20[°C]), the result of CFD simulations by the authors.
We can find many such correlations in the literature (see: [2, 3]) which are all based on either experimental data or CFD simulations.
Gronau and Helbig [11] and many others since then have used CFD simulations to demonstrate the same effect, but for airflow-windows, where the airflow is controlled and one directional.
Models for whole window heat transfer The multidimensional heat transfer through window frames and the edge of glass area is usually calculated with 2D heat flow simulations based on either the finite element or the finite difference method.

In general, a computational fluid dynamics (CFD) study provides quantitative global flow data away from the wall or simply qualitative data [24].
It is interesting to note that the models developed as part of this CFD work could be a fondamental tool for vascular surgery during pre- and post-surgery.
Lee, P.Ho, Investigation of hemodynamics in the development of dissecting aneurysm within patient-specific dissecting aneurismal aortas using computational fluid dynamics (CFD) simulations, Journal of Biomechanics. 44 (2011) 827-836
Ramos, Aorta Ascending Aneurysm Analysis Using CFD models towards Possible Anomalies, fluids. 2, 31 (2017) 1-15
Geest, Simulation and probabilistic failure prediction of grafts for aortic aneurysm, Engineering Computations. 27 (2010) 84–105