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Numerical Simulation of Air Distribution and Particle Movement in a Displacement Ventilated Room Zebei Wang 1,a, Baoqing Wang 1,b, Ronghui Chen1,c, Shu Yao1,d College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China a411173744@qq.com, bwbqchina@163.com, c13609223@njau.edu.cn, dmadkon@qq.com Keywords: displacement ventilated room, numerical simulation, air movement, particle distribution Abstract.
In this paper, the air movement and particle distribution in a displacement ventilation room is studied and analyzed through CFD numerical simulation method.
Results and discussions This paper selects two typical surfaces to describe the results of simulation, including X=1.65m which respects the profile through the center of room; X=0.6m which through the virtual human body.
Conclusions A CFD-based ventilation test method is presented in the study.

In order to solve the problem of heat dissipation, a kind of fan cooling scheme has been designed according to structure characteristic of the controller, CFD software ICEPAK is used in the report to make a numerical simulation as well as a simulation analysis for fan cooling scheme and the original scheme, By comparing cooling effects of two cooling schemes, the fan cooling scheme can not only meet the cooling requirements, but also the structure is relatively simple. 
Introduction With the improvement of modern electronic equipment reliability, performance and power density, thermal design is more and more important .In order to achieve the best cooling effect,  according to different working environment, numerical simulations of thermal analysis software can greatly shorten the design time, improve the design efficiency [1].The software can simulate system’s thermal condition, it also can find the highest temperature of the product with simulation in the product design stage [2]. 
This paper focuses on the specific shape and power conditions, In order to solve the problem of heat dissipation, a kind of fan cooling scheme has been designed According to structure characteristic of the controller, CFD software ICEPAK is used in the report to make a numerical simulation .the results show that the fan cooling scheme can not only meet the cooling requirements, but also the structure o is relatively simple. 
JIANG: Simulation and Optimization of Heat Transfer Process for Columnar Radiator[J] journal of guangzhou university,2012,11( 3) : 81-85
LI, H.D LIU: Application of Thermal Simulation in the Structural Design of Electronic System[J]. electronics process technology,2006,27( 3) : 165-181

In addition, high requirements of equipment to obtain the flow characteristics of ring seals which is costly, it is very difficult to obtain the leakage through experimental method, and based on CFD simulation is often ignored seal ring clearance in most cases.
Thus, the integral model of wear-ring was considered to simulate by CFD and it has great significance to analyze its volume loss [2, 3].
American Baskharone use finite element analysis method for multi-stage pump to simulate internal clearance leakage flow and analyze its impact by way of CFD, and the results compare to the existing model with leakage[ 4].
In summary, the numerical results indicates it more accurate and feasible for submersible well pump simulation.
Zhao: Research on Wear-rings of Centrifugal Pump Based on CFD Cod (MS., Huazhong University of Science, China 2006), p. 27-28, 47-49

Numerical simulation Abstract.
Lattice Boltzmann methods (LBM) have become an alternative to conventional computational fluid dynamics (CFD) methods for various systems.
Simulation indicate that LBM can simulate the vortex taking place and shedding effectively.
After twenty years of development, lattice Boltzmann methods have become an alternative to conventional computational fluid dynamics (CFD) methods for various systems.
The data demonstrate the validity of LBM simulation.

Because conventional analytical methods for solving complicated case are insufficient, so there is selected prediction of thermal prediction by using CFD modelling.
Physics and Boundary Conditions, Pre-Processing It was necessary to create a simplified geometric model of simulated domain (see Figure 5) for CFD simulation.
Simplified geometric model for CFD.
The simulation is solved as three-dimensional, steady, stationary.
The simulation considers only overpressure ventilation at this space.

A powerful mathematical modeling to predict gaseous pollutant concentration at atmosphere and different CFD simulations results by Ansys CFX® software are presented.
The CFD simulation is realized by the discretization of partial deferential equation, through numerical methods.
CFD Application The Physical Problem.
Results and Analysis Experimental Planning for Simulations.
Table 6 - Conditions of stability used on simulations.

Development of SIMPLE-like Algorithms for Incompressible Navier-stokes Equations in Liquid Processing of Materials Haijun GONG1, a, Yang LIU2, b, Xueyi FAN1, c and Daming XU1, d 1 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China 2 School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150301, Heilongjiang, China a331ghj@163.com, bkaxiu_0453@126.com, cfan_xueyi@yahoo.com.cn, ddamingxu@hit.eu.cn Keywords: incompressible flow, Navier–Stokes equation, SIMPLE-like algorithm, numerical simulation, CFD Abstract.
For a clear and comprehensive opinion on segregated SIMPLE algorithm in the area of computational fluid dynamics (CFD) during liquid processing of materials, the most significant developments on the SIMPLE algorithm and its variants are briefly reviewed.
In general, the grids commonly used in CFD can be divided into structured grid and unstructured grid.
Correspondingly, structured grids are easy to generate and deal with correspondingly, and can provide more effective and accurate simulation than unstructured grids usually, so structured grids, such as staggered grids, collocated grids and nonorthogonal grids were applied widely.
，et al: Numerical Simulation of Heat, Mass and Momentum Transport Behaviors in Directionally Solidifying Alloy Castings Under Electromagnetic Fields Using an Extended Direct-Simple Scheme, Int J Num.

The flow characteristic and differential pressure-flow of outlet blockage fault and trouble-free for control valve are simulated by CFD.
Blockage Fault Simulation Analysis Simulation Settings A block is designed at the interface section of valve and pipeline to simulate the outlet blockage fault, and on the basis of it, the flow channel model of outlet blockage is set up.
Table 2 Simulation Settings settings solver turbulence model media boundary conditions differential pressure parameters separating Standard k-ε equation mixed gas pressure inlet / outlet 0.4MPa Analysis of Simulation Results Analysis of Flow Characteristic Fig.5 is the flow characteristic of trouble-free and outlet blockage.
Conclusion Establishing the valve trouble-free and outlet blockage flow model, and applying the CFD numerical simulation of flow characteristic and differential pressure-flow, obtained the following conclusions
References [1] Yantao An, Rujian Ma, Yong Wang, Simulation and Analysis the Internal Flow Field of Control Valve Bonnet Leakage, Applied Mechanics and Materials [J], 2013, 425, 2078-2081

A Simulation Study of Flow and Pressure Distribution Patterns in a Two Stage Three Bucket Savonius Vertical Axis Wind Turbine Micha Premkumar T1, a, Seralathan S2, b, Ravikumar T S3, c and Jayagopal J4 1,2,3,4 Department of Mechanical Engineering, Hindustan Institute of Technology and Science Hindustan University, Padur 603 103, Tamil Nadu, India atmichamech@gmail.com, bsiva.seralathan@gmail.com, cravikumar@hindustanuniv.ac.in Keywords: CFD, two stage, three bucket, Savonius wind turbine.
Conventional Savonius vertical axis wind turbine and Dimensional details of SVAWT Numerical Methodology The numerical simulation is carried out with the commercial CFD code, ANSYS CFX 13.0©.
ANSYS ICEM CFD 13.0© is used to generate unstructured grid with tetrahedral elements in the computational domain along with flat prism shaped cells introduced near the wall.
Sunanto, Computer simulation studies on the effect overlap ratio for savonius type vertical axis marine current turbine, Int.
[15] Ivan Dobrev and Fawaz Massouh, CFD and PIV investigation of unsteady flow through Savonius wind turbine, Energy Procedia 6 (2011) 711-720

The final structure parameters were obtained by CFD numerical simulation optimization iterately.
Simulation results show that: The combination vortex pump meet the design requirements.
Numerical simulation and analysis The main geometric parameters of three stage combination vortex pump acquired in table 1.
Then CFD numerical simulation is carried out to optimize the structural parameters of the pump.
“Design and Simulation of Aero-engine High Pressure Centrifugal Pump,” Computer Simulation, vol.28, 2011 pp. 84-87