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The speed coefficient method based nuclear main pump design and CFD analysis Yan Liu1,a, Qiang Wang1,a, Peng-fei Zhao2,b 1School of Energy and Power Engineering, Dalian University of Technology, Dalian, China 2School of Naval Architecture Engineering, Dalian University of Technology, Dalian, China aandysnowqiang@sina.com, bzpfff@hotmail.com Keywords:nuclear main pump; spead coefficient; numerical simulation; impeller; leakage Abstract.Nuclear main pumps are one of the most important devices in nuclear plants.
Meanwhile numerical simulations are carried out to examine performances of the designed pump.
Meanwhile numerical studies based on computational fluid dynamics (CFD) technology are carried out to examine performances of the designed pump.
Numerical method To examine whether performances of the designed nuclear main pump meet demands or specifications, numerical simulations of water flow in the pump are carried out.
After repeated modification and numerical simulations, a relatively excellent hydraulic model is obtained.

Flow configuration and simulation Methodology Geometry and Computational Grid.
(Fig.4) Fig.3 Blowing apertures grid Fig.4 The structured grid near the high-lift airfoil Simulation Methodology.
The commercial CFD flow solver, Ansys Fluent, was used to compute the flow field.
In all simulation cases, the free stream Mach number was fixed at 0.2 and the Reynolds number based on the stowed chord was about 20 millions.
Since this simulation is only two-dimensional, no flap side-edge related noise signal is included[12].

Stimulation study over the capacity of air distribution to eliminate the contaminant in isolation wards Ji Yunzhe1, a and Wang Xiaojie1,b 1College of Service, Naval University of Engineering, Tianjin 300450, PR China ajiyunzhe99@163.com, bwxjwxj1973@163.com Keywords: air distribution, ACH, CFD Abstract.
The conclusion also proves that using the CFD technology to simulate could have great guiding significance on determining the various form factors of the air distributions in the wards.
This paper will research the influencing factors of the contaminant concentration in the wards by using the CFD technology to simulate the distribution and the amount change of the contaminant granular after they are released by the contaminant source.
To eliminate 90% of the particles, the simulation result in 16ACH is 0.22min longer than the result calculated theoretically, in 12ACH 0.51min, in 9ACH 1.67min, 6CH 2.01min.
People could find from the results that the difference between the simulation result and the theoretically calculated result will increase with the increase of the ventilation rate.

Numerical Simulation of Hydraulic Characteristic of Oxidation Ditch W.l.
Liub Institute of Hydraulic Engineering, Xian University of Technology, Xian China awei_wenli@126.com, bwwl_p@126.com Keywords: hydrodynamics; simulation; oxidation ditch Abstract: A numerical simulation study of the hydrodynamics of oxidation ditch is presented.
Bob[l] and Stamon [2] carried on numerical simulation for the two-dimensional velocity of the integrated oxidation ditch by using the k– mathematical model, and analyzed the water flows in the diversion wall.
This paper focuses on the hydrodynamics of oxidation ditch by the simulation method.
The flow field in the oxidation ditch is simulated with computational fluid dynamics (CFD).

Tests and simulations provide strong proofs for the structure design and motion control of the robot.
CFD (Computational Fluid Dynamics) software package is used to pre-process (including geometric modeling and mesh generation), calculate and analyze the flow field force acting on robot [7].
The dynamics equation based on space operator algebraic (SOA) method is established, and flow field acting on the robot pre-calculated by CFD software package, on this basis, the dynamic behavior of the in-pipe robot has been analyzed.
Numerical Simulation and Experimental Study for Vascular Interventional Treatment by Bifurcated Artery[D].
Collaborative Simulation Based on MATLAB/Simulink and FLUENT. 2007, 19(1) 1824-1827, 1856(in Chinese).

Numerical simulation of corrugated depth on the performance of plate heat exchanger Yuhan Zhao, Yifan Wu, Haijin Cheng, Guolei Zhu Shanghai University of Engineering Science, China yuhanooo@hotmail.com Keywords: corrugation depth, plate heat exchanger, numerical simulation Abstract.
In this paper the numerical simulation is performed by using the CFD soft FLUENT.
In the following sections, numerical simulations will be explored on the flow resistance and heat transfer performance of the plate heat exchanger.
Numerical simulations on flow and heat transfer characteristics The sketch of the plate heat exchanger is shown in Fig. 1.
Simulation of stirred yoghurt processing in plate exchangers, Journal of Food Engineering, 2005, 69: 281-290

Considering its specific characteristics, CFD method based on FLUENT is taken to its thermodynamic calculation.
In this paper, air-duct system in ARJ21-700 is introduced and then numerical simulation is conducted to the analysis of heat transfer, fluid flow and the leak detection parameters’ effects upon the air-duct insulation design. 2.
While considering that conventional heat-insulating calculation method is not involving this point, CFD method is derived for further research. 3.
Numerical simulation 3.1.

Comparing Simulation for Turbulent Dispersion and Coalescence of Droplets within a Spray with two Models Shaoyun Deng1, a 1Xinjiang Applicative Polytechnic, Kuitun, 833200, China anhrisydeng@163.com Keywords: Model, Simulate, Turbulent Dispersion, Coalescence, Spray.
The ultimate aim of this paper is to develop a validated CFD model to predict the extent of particle agglomeration within a spray dryer, and the flow patterns and drying of particles, and to use this predictive tool to design more efficient spray dryers that produce higher throughputs.
Methods It is the aim of the author to address this gap in fundamental understanding and to develop a Computational Fluid Dynamics (CFD) model to predict the turbulent dispersion and coalescence of droplets within a spray.
A commercially-available Computational Fluid Dynamic (CFD) program called ANSYS CFX4 is used to solve the equation sets for the Eulerian and Lagrangian approaches described above.
All subsequent simulations involving different droplet flows, gas flows or droplet size distributions adopt the same values for these parameters.

The full flow field model of a widely used multi-blade centrifugal was built, using the CFD method, the steady and unsteady numerical simulation of the inner flow in the fan at different working conditions are presented.
The numerical simulation results were validated by contrasting to the experiment results.
The quality of the grids is one of the key factors determining performance of numerical simulation [3].
In order to make sure the stability of the unsteady simulation, the steady numerical simulation is done at first based on the same mesh subdivision, after that, the results of the steady simulation are used as the beginning field to proceed with the whole passage unsteady simulation inside the multi-blade centrifugal fan.
Simulation results and analysis Comparison between simulation and experiment.

Effects of intake pressure difference on the flow near valve seat in diesel engine using three dimensional computation Hongmeng Li1, a, Guoxiu Li1, b, Yusong Yu1, c,Ronggang Gao1, d, Peng Zhao1, e and Ye Yuan1, f 1School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China a11116350@bjtu.edu.cn, bgxli@bjtu.edu.cn, cysyu@bjtu.edu.cn, d10121593@bjtu.edu.cn, eemailzp@163.com, f10116322@bjtu.edu.cn, Keywords: diesel engine; intake port; discharge coefficient; pressure drop Abstract：In this paper an extensive CFD simulation of a four-stroke diesel engine is done.
In this research, we set four intake pressure fifferences-10kPa, 50kPa, 100kPa, 150kPa for simulation.
Geometrical model The geometrical models for computation include air inlet pressure stabilizing chamber, intake port, valve seat, valve and Simulation cylinder.
(In Chinese) [2]Yuan-jing Hou.Three Dimensional Simulation for Dual-Intake Ports of Turbocharged Diesel Engine[D]Beijing: Beijing Jiaotong University,2011.
(In Chinese) [3]AVL fire Version 2008——CFD Solver．2008.6．38-40 [4]DurbinP.