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It indicated that performance characteristics of centrifugal compressor under off-Design condition could be predicted by computational fluid dynamics (CFD) technology.
Furthermore, internal flow characteristics and load distribution could be visualized directly by CFD post processing graph. 1 Introduction Centrifugal compressor was employed in aircraft environmental control system to pressurize the bleed air from engine.
Numerical Simulation 3.1 Computational model Main components of centrifugal compressor include impeller and diffuser.
CFD and Expriment Verification for Characteristics of Supercharge Compressor.

Republic of Korea aapdlwl11@hanmail.net, ba20lee21@naver.com, c hclim@pusan.ac.kr Keywords:CFD, Aerodynamic characteristics, Airfoil, NACA0015, Near-wall modeling.
Abstract.In this study, a numerical simulation is made to understand the effect of the angle of attack on a NACA airfoil, which will be used for a basic shape to apply for making the vertical axis Darius wind turbine.
The y+ is a non-dimensional number to understand near wall mesh quality to describe the effect of turbulent and laminar flow used to predict the behavior using numerical simulation from the wall to the grid.
Through the numerical simulation, the current approach (the combination of k-ω SST turbulence model and y+ <1)is appropriate condition to simulate the aerodynamic characteristics around the airfoil.
B, TheDarrieus wind turbine: Proposal for a new performance prediction model based on CFD, 2011. pp. 3-8.

Since 1970s, many researchers have done lots of worker on the modelling of shell-and-tube heat exchangers using Computational Fluid Dynamics techniques (CFD), as well as some modifications to the solution algorithm [3,4,5].
However, the CFD method couldn’t be used extensively for it’s rather time-consuming.
Simulation Modelling Practice and Theory, Vol.17 (2009), p. 897-910
Analysis and Simulation of Chemical Engineering System, China Chemical Industry Press, Beijing (1990)
Steady-state Simulation Technology of Process System, China Petrochemical Press, Beijing (1999)

Based on the conditions of Guanjiao tunnel, numerical analysis of air flow field is carried out by the finite element software—CFD in this paper.
The construction method of Guanjiao Tunnel is drilling and blasting. 10 Inclined shafts and local aid are adopted in the construction Numerical simulation of air flow inside the tunnel Differential equations.
Conclusion Ventilation of the tunnel is simulated by the finite element software—CFD in this paper.

Numerical Simulation and Analysis of Interior Shear Stress in Centrifugal Cardio Pump DAI Xue-bing1,a，XU Jian-pu2,b，ZHANG liang2,c 1 Petrochina Anhui Marketing Company, Anhui ,230041,China 2Harbin Tianyuan Petrochemical Engineering Co.Ltd,Harbin,150090,China a124560496@qq.com, bjianpu252800@sina.com, c11941153@qq.com Keywords: centrifugal cardio pump; CFD; numerical simulation; shear stress; hemolytic; speed coefficient method Abstract.
We can obtain the flow distribution of impeller and inside the shell at design conditions from geometric modeling and numerical simulation of two cardio pumps by using related software, and compared the interior shear stress distribution of two cardio pumps at the same condition.
calculation results and analysis The calculation results of cardio pump internal shear stress were analyzed from numerical simulation. 4.1.
Conclusion Numerical simulations were carried out for two centrifugal cardio pumps with recirculation region and anti-recirculation region.
Journal of Biomedical Engineering , 2003;20(4) 605～607(in Chinese) [6] Wang Guangyi .Numerical Simulation and Analysis of Conical spiral impeller Blood Pump Flow Field[Ｄ].

Analysis of CFD for The Vortex Rope in The Draft Tube Urged by The Long and Short Blades Runner Si Qing Zhang 1, a, Chang Zhen Li 1, b, Li Xiang Zhang 2, c, Xiao Xu Zhang 1, d 1 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China 2 Faculty of Architectural Engineering, Kunming University of Science and Technology, Kunming 650051, China a 363685119@qq.com, b 51438917@qq.com, c zlxzcc@126.com, d xiaoxuzhang86@hotmail.com Keywords: Water encouragement, The flow pattern of draft tube, The change of vortex rope.
Under 8 typical operating conditions, numerical simulation on how the runner outlet urge the vortex rope in draft tube are accomplished in this paper, and the calculation models are long blade model and mixed blade model.
Wang: Analysis of Computational Fluid Dynamics-principle and application of CFD software( Tsinghua University Press, China 2004) [4] Z.Z.
Lan: Simulation for fluid engineering( Institute of Technology Press, China 2004) [5] Thomas Vekve.
Wu, et al: Theories and Applications of Flow Refined Simulation for Hydraulic and Hydropower Engineering( Science Press, China 2006) [7] S.H.

Numerical Simulation on Cylinder Flow Field of Diesel Yindong Song1,2,a, Yinnan Yuan1,3, Chunping Wu2, Yongwang Li2, Pengzhe Qi2, Shuangbo, Wang2 1School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013 2School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003 China 3 School of Mechanical Engineering, Nantong University, Nantong 226019 asongyindong@163.com Keywords: diesel, numerical simulation, k-ζ-f model Abstract.
Three dimensional transient numerical simulation on cylinder flow field of 4B26 diesel was done by AVL FIRE.
This paper calculated the air motion of diesel cylinder by AVL FIRE CFD software.
Dynamic grid technology was used in this simulation.
Simulation results Inorder to analyse the flow field in cylinder, this paper select 5°CA BTDC, TDC, 5°CA ATDC, 10°CA ATDC and 20°CA ATDC typical moment.

Simulation Study about Impact of Building Density on Heat Island Effect Xiao-yu LUO1,a *, Jian GE1,b and Yun ZHANG1,c 1 Room506, Yueya Buiding, Zijinggang Campus, Zhejiang University, China a120819598@qq.com, bgejian1@zju.edu.cn, c35136794@qq.com *Corresponding author Keywords: Numerical simulation, Heat island effect, Building density.= Abstract.
In this research the relationship between the heat island effect and the building density has been studied by CFD software with other factors such as the building height and construction shape unchanged.
Through a series of simulation and data analysis it is revealed that the effect of building density on the thermal conductivity is obvious.
The simulation of temperature changes was made only regarding building density, which ranges from 8% to 46%.
In the study, the computational simulation software we applied was Phoenics.

Computational fluid dynamics simulation shows that the average shear stress on pore walls is linear with the major axis when the bone scaffold porosity is maintained in the same level, and the distribution of shear stress trends to be more uniform with the increase of the major axis.
Table 1 Parameter of scaffold unit cell pore parameter （mm） a/b porosity connection diameter (mm) a=0.23,b=0.2215 1.0384 70.03% 0.1094 a=0.24,b=0.2175 1.1034 69.98% 0.1202 a=0.25,b=0.2145 1.1655 70.06% 0.1287 a=0.26,b=0.2118 1.2276 70.01% 0.1353 a=0.27,b=0.2096 1.2882 70.00% 0.1408 2.2 Solving parameters for CFD In order to study the effect of pore structure on fluid shear stress within scaffold pore walls, all of the scaffolds are suffered perfusion under volume flow rate of 0.1ml/min, 0.5 ml/min and 1 ml/min.
Post-processing graphics tools were used to analyze and present the CFD simulation results.
The combined study of simulation and perfusion culture may produce better scaffold and perfusion bioreactor, which can largely accelerate the process of bone tissue engineering.

The computational fluid dynamics (CFD) software such as FLUENT can numerical compute and analysis kinds of fluid dynamic problems.
Reference [5] realized simulation for proton exchange membrane fuel cells based on SIMULINK/FLUENT collaborative simulation.
FLUENT/SIMULINK Collaborative Simulation Principle and Realize Method Principle of Collaborative Simulation.
Fig.1 Collaborative simulation principle chart Fig. 2 Parallel collaborative simulation flow chart Parallel Collaborative Simulation Method.
The simulation time step was 0.002S.