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Numerical simulation has been widely used in analysis of impeller design and flow field.
In most cases, the application of CFD technology in the design of the hydraulic model can effectively reflect the distribution of the field of the centrifugal pump.
Numerical Simulation of Flow Field Inside of Centrifugal Pump Based on Dynamics Mesh.
Numerical simulation of unsteady flow in a multistage centrifugal pump using sliding mesh technique.
Numerical simulation of the stalled flow within a vaned centrifugal pump.

Numerical Simulation on Axial Flow Fan Performance with Changing Tip Clearance Zhou Ye1, a, Haiyang Zhao1, b, Lu Zhang1, Chun Li1 and Wei Gao1 1School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 20093, P.R.China aye-pei-yu@163.com, bstream2608@qq.com Keywords: axial flow fan; numerical simulation; tip clearance.
In recent years, with the development of computer technology and CFD technology, the 3-D viscous flow computation technology becomes mature, can be relatively accurate to solve the 3-D viscous flow field of the fluid machinery.
Wensheng Ma, Chunwei Gu analyzed certain stages of a multistage axial compressor by CFD numerical simulation, and revealed the characteristics of clearance loss, and the simulation results have a good agreement with designed stage-between parameters [4].
By changing the blade tip clearance of an axial flow fan, numerical simulations were carried out respectively under the same condition.
Numerical Simulations Calculation Method.

Some mesh models were established to simulate the effect through CFD software.
Through the simulation by CFD software and testing of prototype, it is proved that this new structure can make traditional wind turbine work well in low speed; turbulence and frequent changes in direction of wind conditions.
CFD software is used to simulate the growth rate of the airflow velocity inside the fluid tube.
The CFD software simulation results are shown in Fig.9 and Fig.10.
Fig.9 Velocity vectors around the fluid tube Fig.10Velocity distributes in middle tube cross-section Results of prototype testing A prototype model has been produced to verify the CFD software simulation results.

Simulation program ANSYS.
There is a new way based on computer simulation.
In my case, the simulation program ANSYS based upon variation method of finite elements supported by FLOTRAN CFD module has been used for this method.
In ANSYS system there are two basic elements for FLORTAN – CFD.
Using the element in FLORTAN – CFD the calculation for fluctuant and thermal distribution through area of elements forming the network is carried out.

Asfour and Gadi [3] demonstrated the CFD is useful to predict the wind-driven natural ventilation in buildings and compared the implementation of computational fluid dynamics (CFD) and Network models for airflow rate estimation.
Gan [6] investigated the buoyancy-driven natural ventilation of buildings by CFD methods.
In this paper, the authors numerically investigated the natural ventilation in a workshop with heat sources based on CFD method.
Sketch of workshop ( 1: air inlet opening; 2: air outlet opening; 3: workshop entrance; 4: heat sources) Numerical model and simulation method.
Realizable k−ε turbulent model was selected for the CFD calculation after several trial calculations and comparison to related experimental data.

The simulation analysis results were tested on a real machine for validation in order to identify the reliability of the simulation.
This study adopted 3D CFD software, and combined the finite volume method, SIMPLE algorithm, and first order upwind difference method for numerical analysis.
Thus, the 180943 mesh was used for this simulation in order to maintain the accuracy and reduce simulation time.
The CFD simulation analysis and the prediction analysis results of the atomization flow field were used for comparison and validation through actual tests, so as to build a reliable computer simulation analysis model for the ultrasonic atomization spray coating process.
E., “REFLEQS-2D: A Computer Program for Turbulent Flows With and Without Chemical Reaction, Volume 2: Validation Manual,” GR-88-4, CFD Research Corporation, Huntsville, AL (1989)

Numerical Simulation of Radon Atmospheric Dynamic Diffusion from a Flat ground Uranium Tailings Impoundment Xiaoyong Peng1, a, Xin Zhang2, b, Shuai Huang3, c, Xusheng Chai4, d, and Lanxia Guo5, e University Of South China, Hengyang, Hunan, 421001, China apengxiaoyong@126.com, bzhangxin646218@163.com, chs2039@163.com, dchaixusheng@yeah.net, eguo_lanxia@163.com Keywords: Uranium Tailings Impoundment, Radon, Atmospheric Diffusion, Numerical Simulation Abstract: with a flat ground uranium tailings impoundment as the object of the paper, CFD technology was used to study the atmospheric dynamic diffusion characteristics and the evolution of time and space distribution of radon in the uranium tailings impoundment.
The numerical simulations about radon atmospheric diffusion in uranium tailings impoundment were almost the steady-state diffusion process at present, the literature[3, 4] studied a flat ground uranium tailings radon atmospheric diffusion and environmental effect and different heights of uranium tailings radon atmospheric diffusion and concentration distribution law by numerical simulation method; porous media model and CFD technology were used to analyze the effect of vegetation cover in uranium tailings beach surface on radon atmospheric diffusion in the literature[5].
Numerical Simulation Results and Analysis of Radon Atmospheric Dynamic Diffusion Process Times and Space Evolution Process of Radon Atmospheric Diffusion.
Numerical simulation of atmospheric diffusion of radon emitted from ground uranium tailings impoundment and environmental effects.
Numerical Simulation of Influence of Vegetation on Atmospheric Diffusion of Radon Emanating from Uranium Tailings Impoundment.

Fouling resistance distribution along the membrane surface was obtained from the simulation.
During the past decades, CFD method has been extensively conducted to understand the mass transfer phenomenon in membrane fouling.
Madaeni et al.[6] used CFD simulations to investigate the local permeate and pressure distribution, as well as the influence of shear rate on membrane fouling in Micro-filtration.
One specific CFD simulation model was developed to couple the hydrodynamic and mass transfer governing equations.
Boundary condition and mesh in simulation Fig.1.

Three new shapes of hull bow design for the multipurpose amphibious vehicle were conducted at several speeds to investigate the hydrodynamic phenomena using Computational Fluid Dynamics (CFD, RANS code), which is applied by Ansys-CFX14.0 and Maxsurf.
This research would be done via CFD (ANSYS-CFX 14.0) and analyzed the hydrodynamic resistance.
A significant number of applications of computational fluid dynamics (CFD) tools to hydrodynamic optimization, mostly for reducing calm-water drag and wave patterns, demonstrate a growing interest in optimization.
Pressure drag (i.e., form resistance) and wave resistance are frequently optimized using Computational Fluid Dynamics (CFD) but the total wetted surface remains a given.
CFD will play an important role in determining these causes by providing a detailed understanding of the physical phenomena.

The mathematical models for the ship and the propeller have been built and validated using computational fluid dynamics (CFD), then unsteady simulation done to obtain the transient responses of the propeller excitations.
The predicting Methodology : Mathematical calculation model (CFD and FEM) : - Ship Model is the 35,000DWT Bulk Carrier "MARINE PRINCESS” model No.
After the validation of the propeller-hull interaction at model scale, the model is scaled to full scale and unsteady RANS simulations have been used via FLUENT software to calculate the induced 3-D hydrodynamic forces of the propeller.
The forces on the propeller surface nodes (14879 nodes) have been extracted from CFD with time step 0.01 s for a total time 5.107 seconds.
Numerical prediction of propeller excited acoustic response of submarine structure based on CFD, FEM and BEM, Journal of Hydrodynamics, 24(2), 207-216, (2012)