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With the development of computational fluid dynamics (CFD), the simulation of complex flow problems is possible, it just overcomes the weaknesses of the first two methods.
Discrete approximation method, calculated parameters of the observation or testing, researchers’ experience and skills of programming and data use are the three main reasons of CFD errors[1-4].
So choosing the right model and calculation method to simulate the flow of centrifugal pumps for improving the applicability of CFD, continuous improvement of centrifugal pump performance has a very good engineering sense.
And common simulation methods are steady multi-phase and unsteady.
The literatures of steady on the multi-phase simulation and compare with two simulations are rare currently.

Based on the numerical simulation experience of CFD for high temperature and high velocity compressible flow [6], and combined with the temperature comparison and modification method [7,8], the convection heat transfer of ribbed plate is operated.
The adiabatic wall temperature and real wall temperature are and , and the adiabatic wall temperature is obtained by CFD.
Numerical simulation results of CFD Adiabatic flow field of jet-flow is simulated by CFD.
The program of thermal analysis for ribbed plate is compiled and the dates from CFD are utilized.
Though analyzed, the dates include jet-flow velocity, Mach number, pressure, temperature and enthalpy, some of the results from CFD are showed in Fig.2 and Fig.3.

Calculations was carried out using SUTCAST simulation software based on solving Navier-Stokes equation and tracing the free surface using SOLA-VOF algorithm.
This arrangement, similarity of different molds except of sprue bases, allows for direct comparison of the behavior of liquid metal flow and performance of the castings acquired by using different sprue bases. 2.2 CFD Model In order to simulate the metal flow in gating systems with different sprue base, CFD modeling was used.
In the filling simulation, the volume of fluid (VOF) method was implemented to track the moving free surface of molten aluminum in the gating system.
Conclusion Effects of employing different sprue bases (No well, standard, large wells and curved sprue base) have been investigated by computational fluid dynamics (CFD) in the present work.
Hirt: 'Casting simulation: mold filling and solidification- benchmark calculations using FLOW-3D®.

With the rapid development of computer technology, computational fluid dynamics (CFD) has already been proved to be a useful and powerful tool in fire safety science.
With the rapid development of computer technology, computational fluid dynamics (CFD) has already been proved to be a useful and powerful tool in fire safety science [3].
In this simulation, Large Eddy Simulation (LES) is used as turbulence modeling, which is originally developed by Smagorinsky to study large-scale circulation in the atmosphere.
All the sprinkler is opened by the temperature in this simulation.
From this simulation, it can be shown that case 1 is much more suited to the restroom.

Results and discussion Simulations of microfluid driving and stasis were performed using CFD-ACE + software.
The implementation of CFD-ACE + includes a few processing steps.
Next, CFD-ACE-SOLVER is to iteratively solve the equations.
Simulation results can be dealt with CFD-VIEW for graphing and observing fluid dynamics.
Simulation of microfluid stasis.

LES is a turbulent numerical simulation method that is different from the direct numerical simulation (DNS) and Reynolds average method (RANS).
The large size vortex is solved by direct numerical simulation.
Fig.2 The computational field In order to decrease the number of grid simulation calculation and save time, the half model simulation method is applied.
Hexahedral grid has a relatively rapid convergence rate and tetrahedron grid has very good adaptability that can meet the requirements of CFD. 3.
Simulation Method 3.1 Set up monitoring point.

Modeling and simulation play an important role to reduce these times effectively.
CFD has been successfully used for simulation of various manufacturing processes such as casting and refining [2-6] and spray forming processes [7].
Simulation can estimate the amount of ram force necessary for the extrusion operation.
Simulation model can evaluate different possible options to narrow down the experimental trials.
Thomas in Fourth International Conference on CFD in the Oil and Gas, Metallurgical & Process Industries SINTEF / NTNU Trondheim, Norway, 6-8 June 2005 [7] Spray Simulation by Udo Fritsching, Cambridge University Press, 2004 [8] S.P.

To study the blade-wake interaction of vertical axis tidal turbine (VATT)，particles were placed in the flow field to trace blade wake during numerical simulation.
Numerical simulations were conducted utilizing Euler-Lagrange model.
On the other hand, CFD methods can be divided into two categories: one based on Euler model and the other based on Euler-Lagrange model.
So this paper used the CFD method based on the Euler-Lagrange model to capture the blade wakes.
After blades drill through, the wakes would distortion and curl up to form big vortexes. 4.Conclusion In order to understand blade-wake interaction of VATT, place particles to trace blade wake during numerical simulations, numerical simulations were conducted with Euler-Lagrange model.

2D Simulation of the Gas-solid Two Phase Flow inside the Abrasive Jet (AJ) Nozzle R.
The simulation of the gas-solid two phase flow inside the abrasive jet nozzle is studied by the computed dynamic software (CFD)-FLUENT, the velocity field of the two phase flow and the trajectory of the abrasive inside the nozzle are obtained.
However, many researchers have used computational fluid dynamics (CFD) method to solve problems which can not be solved theoretically and experimentally [5-7].
Simulation Equation The Eulerian model is used as the simulation equation.
Simulation Model The model for simulation is established with a cone angle of 15°, 30° and 45°, and the inside fillet radius of the model is 0.5, 1.0 and 2.0(mm).

By the CFD(computational fluid dynamics) software, the diffusion flow phenomenon is studied.
This article creatively combines the microspheres blood flow with the CFD.
Numerical Simulation Method The S-A Turbulent Flow Model .
Before the multiphase unsteady simulation, a steady flow field without nanometer microspheres has been calculated.
The list of parameters of the simulation case is showed in table.1.