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The Effect of Elliptical Form of Cylinder on Free Convection in Annular Space Elhadi Zoubai1,a* and Bachir Bouhamida1,b Laboratory of LSCMI, Faculty of Mechanical Engineering, USTO-MB, BP 1505, El-Menaouer, Oran, 31000, Algeria ahadi_usto@yahoo.fr, bbouhamida68b@yahoo.fr Keywords: Free convection, thermal science, Newtonian fluid, steady simulation, CFD Abstract.
The governing equations are solved for numerical simulations of steady state and laminar regime.
In order to achieve this numerical simulation, the commercial code ANYS-CFX is used.
Kim, Numerical simulation of natural convection in annuli with internal fns, J.
Kamali, Numerical simulation of a non-equilibrium electrokinetic micro/nano fluidic mixer, J.

Analysis of Criterion Number of Heat Transfer in Micro Catalytic Combustion Process Hu Song, Pan Jianfeng*, Tang Aikun, Shao Xia, Liu Yangxian School of Energy and Power Engineering of Jiangsu University, Zhenjiang 212013, Jiangsu province, China *mike@ujs.edu.cn Key words: Micro combustion, Catalytic combustion, Criterion number of heat transfer, Dimensionless analysis Abstract: Based on a detailed chemical reaction mechanism including gas phase reaction and surface catalytic reaction, adopting the CFD software to simulate the combustion process of premixed hydrogen-oxygen in a sub-millimeter burner, and introducing a calculating model of criterion number of heat transfer, a comparative analysis of surface catalytic conditions is performed to find out the heat transfer characteristics during combustion process.
The simulation results show that the effects of inlet velocity on Nux number vary regionally when gas phase reaction combined with surface catalytic reaction.
Hong, “Numerical Simulation of Catalytic Combustion of CH4 in a Micro-burner”.
[7] JF Pan, J Huang, “Numerical simulation of combustor with annular fins of micro thermophotovoltatic systems”.

Zheng et al. [4] performed numerical simulations and experiments through particle image velocimetry (PIV) to understand the evolution of the asymmetric pattern of baffled tube flow.
Li, CFD simulations of turbulent flow in baffle-filled membrane tubes, Separ. and Purif.

Studying on Computational mechanics simulation and structure prediction, Vibration and control，etc.
Xiao: Performance Analysis on Evaporative Condenser with Fins and Numerical Simulation by Using CFD Software, Fluid Machinery, Vol. 36-10 (2008), p. 78～81.

The Distribution of Oil Pressure in Tube Circuit System Although, in present ,many CFD commercial software are increasingly competent for the calculation in precision calculation projects ,we also need to make some assumptions to simplify the calculation in this paper during determining the distribution of axial oil pressure along the flowing direction .But the axial scale length of this oil pipe is short enough at 22 centimeter ,and the oil velocity is so slow, meanwhile the shape of oil pipe’s cross section area is rarely changing along the oil flowing direction .So the oil pressure is changing very little along the oil flowing direction that it can be seen as a constant parameter .
Koeppel, Comparative finite element analysis of the stress–strain states in three different bonded solid oxide fuel cell seal designs [J], Journal of Power Sources Volume 180, Issue 1, 15 May 2008, Pages 343-353 [8]Weihua.PU, Feng Wang, Optimized design of key structural parameter of common rail injector by orthogonal simulation [J],SHIP SCIENCE AND TECHONOLOGY, 2010 Aug Volume 32 No8 2004
[9] Wang Jun，Zhang Youtong,Lin Xiuxia, Design and Simulation on Common Rail Line of High Pressure Common Rail Injection System in Military Diesel Engine [J], Journal of Academy of Armored Force Engineering ,Jun 2008, Vol. 22 No. 3 [10] Chao.Liang, Jianguo.Yu, Study of Pressure Fluctuation of Diesel Common Rail System [J],Chinese Agricultural Mechanizition , 2010 No.1 [11] Arturode .Risi, Fabrizio.

High temperature coal face heat injury mechanism and airflow characteristics of heat - flow theory and numerical simulation [D].
Computational fluid dynamics analysis -CFD Software Principles and Applications [M].
FLUENT fluid engineering simulation examples and application [M].

All simulation models are based on two significant assumptions namely all parts of the gear are exposed to the same undisturbed water current and the hydrodynamic loads may be represented by dimensionless hydrodynamic coefficients which depend on the Reynolds number, the extended Froude number, see Stengel & Fridman (1977), and a couple of different geometrical and physical parameters of the net respectively the net material only.
It is sufficiently known that the application of these coefficients may lead in some cases to excellent simulation results but in other cases to those which don't satisfy the expectations of experts.
Because of size and flexibility of modern nets and due to substantial fluid-structure interactions it does not seem to be realistic to expect a powerful as well as a handy CFD-based computer programme which can be used for a precise prediction of shape, load and stress distribution of a complete trawl net in the next few years.
Lee: Contributions of Theory of Fishing Gears and related marine Systems, Vol.4, Pukyong National University, Busan, 2006 Hu, F.; Shiode, D.; Wan, R.; Tokai, T. (2006) Accuracy evaluation of numerical simulation of mid-water trawl nets.
KG, Rostock, 2002 Priour, D. (2000) Study of a grid in a cod-end: numerical simulations.

In this paper we first calculate the exit flow by CFD numerical analysis method in terms of different fluid viscosity and pressure drop Δpi .Then we calculate Cdi, Rei with different initial conditions.
Results analysis 3.1 Rectification of the model With the temperature of 80°C, the testing results of the leakage of the rotary seal compare with the theoretical calculation and simulation, shown in Fig.5 as below.
Dynamic Performance Simulation of Power Shift Clutch During Shift[J].

In addition, a predictive approach using simulation was also proposed and reported [4]-[8].
Lim, Process modeling and CFD simulation of two-way abrasive flow machining, The international Jounal of Advanced Manufacturing Technology, 71, 5-8 (2014) 1077-1086.

However, it’s difficult in modern CFD techniques based on massively parallel execution.
Our simulation results show similar trends to the DNS, therefore, it can be concluded that the “laminar + transition criteria” model is effective in predicting hypersonic 3D boundary layer transition.
Ma, Direct numerical simulation of hypersonic boundary layer transition over a blunt cone with a small angle of attack, Phys Fluids. 22 (2010), 025105