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China a shwzhang@mail.neu.edu.cn, b543018827@qq.com, c zhuo3wang6@qq.com d liujince@126.com, ezhjzhang@mail.neu.edu.cn Keywords: CFD, Vacuum Control Valve, Fluent Software, Flow Characteristics Abstract.
During the simulation, the Fluent software of 6.3.26 version was used and the "Pressure based" solver was called.
All simulations were with steady flow under different pressure regions [9, 11, 12].
Simulation Results In simulation, the distribution of velocity, pressure, density and temperature of gas in the models were obtained.
Vasant, International Conference on Power Control and Optimization, Innovation in Power Control for OPtimal Industry.(2008)p.311 [9] Information on http://www.cfd-online.com [10] Fluent Inc., Fluent 6.3 User's Guide. (2006)

Up to now, many simulations and experiments have been completed in foreign countries about the engine [2].
In China little is done about this kind of engine and only some numerical simulations were completed for the reason of limited conditions.
Numerical model For the present simulation, a combustion chamber sector of 60 degrees was set up for computation in Pro/E software.
Fig.1 60° sector geometric model Fig. 2 60°mesh got in the ICEM-CFD The mesh in the cylinder area was dynamic mesh with the motion of piston during combustion process.
So after getting all cells to be used in the analysis, the cell removal, addition and reconnection during simulation were controlled by dynamic grid program.

The measured air velocity then used as an input in simulation work which used Comsol Multiphysics software.
The results from simulations indicate that the air distributions in the room are below ASHRAE standard.
Subsequently, Kolesnikov[10] applied modelling to predict airflow pattern and contamination concentration in the laboratory floor plan using Computational Fluid Dynamics (CFD) The study of Computational Fluid Dynamics by other researchers had motivated the author to study and evaluate the indoor airflow distribution in mechanical ventilation room by using modelling and simulation in Comsol Multiphysics Software.
Niu, A new method of CFD simulation of airflow characteristics of swirling floor diffusers, J.
Building Simulation, (2003) 1429-1434

Simulation and Analysis Gas distribution in fully mechanized coal face.
The application of CFD in air flow design of air-conditioned room.
Numerical simulation of droplet-particle flow in the scrubber for FGD.
Gas Transport Law and Numerical Simulation Under Ventilation.
The application of CFD in air flow design of air-conditioned room.

(a): CFD NWT model.
Goggins, Numerical simulation of linear water waves and wave-structure interaction.
Elangovan, CFD Simulation and Validation of Flap Type Wave-Maker.
Li, Numerical Simulation of Irregular Wave-Simulating Irregular Wave Train.
Elangovan, Simulation of Irregular Waves by CFD.

Up to now the design of IVS in underground car parks is based on empirical knowledge and tested using CFD simulations.
However, just a few studies have been reported on the use of IVS for ventilation or smoke control in underground car parks, and most of them are based on empirical knowledge and tested using CFD simulations on a trial and error basis.
Nele Tilley[15] form Ghent University made a large number of car park CFD simulations, and developed the analytical formulae for required ventilation velocity in car parks, corresponding to a certain smoke backlayering distance, with considering four parameters (convective heat release rate per unit area, fire source area, car park height and car park width).
Though theoretical research and CFD simulations have been studied for many years, these results were not systematic and deep.
ECCOMAS CFD 2010: V European Conference on Computational Fluid Dynamics, Lisbon, June 14-17, 2010 [14] Viegas JC.

The mesh of negative area of cylinder cavity was divided by ANSYS ICEM CFD and the flow field was simulated by ANSYS FLUENT.
Establishment the simulation model Structure and working principle.
ANSYS ICEM CFD is a pre-processing software professional CAE, providing efficient and reliable analysis model for all the world popular software of CAE.
Simulation calculation and analysis Introduction of the dimensionless parameter.
CFD simulation optimization of cooling water jacket structure for 2D25 horizontal diesel engine[J].

Computational model, boundary conditions and grid CFD model.
In the cooling chamber, the simulation is performed by using air as the cooling flow, while velocity and temperature contours are set on the jet holes, pressure on the exit.
The computational domain incorporates the model, the HEXA mesh in the software, ICEM/CFD, used to generate the structured multi-block and the body-fitted grid system.
This study is using a commercial CFD code based on the control-volume method, ANSYS-FLUENT 12.0.16, in order to predict temperature, film cooling effectiveness and velocity fields.
This paper conducts numerical simulation to explore this concept, focusing on the effect of droplet under realistic gas turbine operating conditions at high temperature, velocity, pressure.

The results show that when the mass flow rate between 40-90kg/s the CFD software predicted very well pump heads and efficiencies with experimental data, which was called optimized impeller.
Luckily, the fast progress of computational fluid dynamics (CFD) software provides engineers better tools to improve the design.
The CFX Turbo-mode was used for CFD processing.
Blade and flow regions for simulation Fig.4.
Akbari, The flow simulation of a low-specific-speed high-speed centrifugal pump, Applied Mathematical Modelling, 35 (2011), pp. 242-249.

Numerical Simulation of Suction Valve Internal Flow Field of Large Scale Diaphragm Pump Fluid End Based on ADINA Xue-qin Ling1,a, Wei Zhang1,b, Yang Chen1,c 1NFC (Shenyang) Pump Machinery Co Ltd, Shenyang, China amythcy@126.com, bzwnspi@163.com, ccynspi@163.com Keywords: Diaphragm pump; Suction valve; Numerical simulation; ADINA Abstract.
In this paper, numerical simulation of internal flow field of different suction valves have been done by fluid-solid coupling module in finite element analysis software ADINA.
Fig. 2 Finite element models of structure A suction valve Fig. 3 Finite element models of structure B suction valve Results of Calculation and Simulation Flowing states of structure A and B suction valve at different times (0.5s and 1s) have been simulated by fluid-solid coupling module of ADINA.
References [1] ADINA User Interface Command Reference Manual Volume III: ADINA CFD & FSI Model Definition, Report ARD 09-4 May 2009, ADINA R&D, Inc
[3] ADINA Theory and Modeling Guide Volume III: ADINA CFD & FSI, 09-4 May 2009, ADINA R&D, Inc.