Search results

Simulation results shown that faster angular acceleration made larger pressure fluctuations.
The mesh contained 113 million elements that had been used to perform the simulation on all models in this paper.
Fig. 1 Numerical Simulation Method Fig. 2 Numerical Simulation Method 1.2 Numerical methods This paper has used the method of CFD simulation to study pump characteristics and internal flow fields of pumps with changing speed.
The CFD simulation has been performed by using Fluent6 with the pressure based solver to calculate steady incompressible.
The CFD simulation results indicate that in this process, pressures in the pump showed obvious unsteady, too high transient values could make the impeller damaged, and low pressure bring cavitations.

By the CFD simulation analysis, the feasibility of jet puncture was verified, the interlayer strength of the connection was increased and the Z bunch to the carbon fiber was eliminated, which laid theoretical foundation by enhancing the layered carbon fiber composite perform quality.
Simulation Establish the jet geometry model and set the boundary.
The simulation analysis through CFD to verify the jet puncture is feasible.
Numerical Simulation of High-pressure Jet Nozzle Based on Fluent，J.
ANNSYS Fluid-structure interaction analysis and engineering examples [M].Beijing:China WaterPower Press,2012.1 [5] C.Chen, S.L.Nei, Z.J.Wu, Z.Y.Li A Study of High Pressure Water-jet Characteristics by CFD Simulation [J].

Introduction Study of the flow over car geometries can be performed by numerical simulation．During the recent past，significant progress in the field of computational fluid dynamics(CFD) has also been made，and CFD is gradually becoming established as an efficient tool in vehicle design．The majority of numerical investigations in the field of car aerodynamics have been concerned with grid generation problems around complex three-dimensional geometries，as well as，with the prediction of the aerodynamic coefficients．Takagi [1] presented a review of the applications of computers to automobile aerodynamics, including external flow over car geometries flow in passenger compartments and flow in engine cylinders．Reviews of CFD methods used in automobile aerodynamics have also been published by Kobayashi el al.[2] and Rieger et a1 [3].The research efforts of several other authors in this field can be found in the references of the above review papers．Shaw [4] compared different commercial CFD packages
The objective of the present work is to undertake a complimentary numerical investigation of the flow over a two-dimensional car model.Numerical simulation has also been performed using an incompressible Navier-Stokes code which is based on a pressure-correction algorithm of the SIMPLE-type．
A review of CFD methods and their applications to automobile aerodynamics.
[31]H Rieger F Magagato W Fritz and W Seibert .Numerical simulation of turbulent flows around complex car shapes experiences.

In general, there are three major numerical simulation methods in Computational Fluid Dynamics(CFD): Direct Numerical Simulation(DNS), solving Reynolds Averaged Navier-Stokes equations with statistical turbulence models(RANS) and Large Eddy Simulation(LES).
The least square meshless method was first proposed by Liszka and Orkisz in solid mechanics[1] and was first introduced into CFD by Batina[2].
As a new numerical simulation method in CFD, the research of meshless method combined with turbulence models is few.
Governing Equation of Large Eddy Simulation Large Eddy Simulation is based on the concept of separating the flow into large- and small-scale motions.
Large eddy simulation of the flow past a circular cylinder at ReD=3900[J].

Numerical Simulation of the Transient Development of Slug Flow in Horizontal Pipes Zahid I.
Numerical Simulations The simulation was carried out in a horizontal pipe with a diameter, Dp of 0.16 m and a length, Lp of 87.5Dp.
Table 1: Superficial velocities for the slug flow simulations.
Nigam, “CFD modeling of flow profiles and interfacial phenomena in two-phase flow in pipes,” Chem.
Marin, “CFD modeling of all gas–liquid and vapor–liquid flow regimes predicted by the Baker chart,” Chemical Engineering Journal 138 (2008) 349–357

Analysis of Horizontal air-separator Field of Municipal Solid Waste Based on CFD Shuliang Zoua,Yiqiang Liub, Dewen Tang c Key Laboratory, School of Mechanical Engineering, University of South China, Hengyang, 421001, Hunan, China azoushuliang@usc.edu.cn, bliuyiqiang2007@yeah.net, c26379198@qq.com Key words: MSW (municipal solid waste), Horizontal Flow Separating Field, CFD, numerical simulation.
Therefore, it is very difficult to study with specific simulation according to the actual situation.
To simplify the solving process, some simplifications and assumptions on particle shape and size of MSW and airflow of Horizontal air-separator were made in establishing the wind filed simulation model.
（5）The gas flow rate at the entrance of Horizontal Airflow winnowing machine device is uniform, while, the velocity of municipal solid waste particles entering the winnowing simulation field at the entrance is idealized as constant speed and is far less than the gas flow rate
Investigation and simulation of a cross-flow air classifier[J].

The software tool Fire Dynamics Simulator (FDS) is used for simulation and data analysis, which applies CFD technology to the continuum motion.
The simulation is therefore solved for time T = 10 minutes.
An alternative approach by CFD method after simulation and analysis of results in FDS and MS Excel programs can be declared valid from the condition VFVn = 675,208 m3 ≤ VNVs =783,006 m3.
Conclusion The following is evident from the discussion chapter: · The hypothesis of the applicability of the alternative approach to solving the problem is confirmed according to the simulation by the CFD method and subsequent analysis in the FDS and MS Excel programs.
However, the result of the simulation performed this way depends on several different factors, that must be considered

Using ANSYS-FLOTRAN CFD program, the finite element simulation is conducted by a series of procedures, such as three-dimensional model building of airflow inclination sensor, network modifying, loads applying and equation solving.
Solve of finite element method FLOTRAN CFD analysis function of ANSYS software is used for analysis 2d and 3d fluid flow of advanced tools.
(1) Selection of analyzing types: the choice of FLOTRAN CFD analysis capabilities of ANSYS software
With the slice observation function of FLOTRAN CFD observation of inside the temperature and velocity field distribution can be seen.
[2] Guoqiang.Wang, “Numerical simulation and practice on ANSYS,” [M].

As the development of Computational Fluid Dynamics (CFD), many researches on numerical simulation of muzzle flow field appear at home an abroad.
Besides the dynamic mesh technique there is another method to deal with moving body in CFD called chimera method.
At the beginning of simulation, the projectile axial velocity is 713m/s.
Numerical simulation of complex unsteady muzzle flow field [D].
Numerical simulation of bullet accelerating process at after-effect period [J].

CFD study on effect of the air supply velocity on contaminant transport within an road vehicle cabin Liping XIANGa, Hanqing WANGb School of Civil Engineering, Hunan University of Technology, Zhuzhou, Hunan, 412008, China aelephantxlp@163.com, bhqwang2006@yahoo.com.cn Key words: road vehicle cabin, concentration field, numerical simulation Abstract: The RNG turbulence model and species transport model were employed to simulate the dispersion of CO2 contaminant in the road vehicle cabin.
Simulation scenarios Road vehicle geometry .
In order to save calculation capacity, simulation configuration was simplified and one half of the vehicle cabin in length was considered.
Simulation modeling.
Boundary conditions in CFD simulations.