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首页> 外文期刊>European Journal of Mechanics, B. Fluids >A two-dimensional computational study of gas flow regimes past of square cylinder confined in a long microchannel
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A two-dimensional computational study of gas flow regimes past of square cylinder confined in a long microchannel

机译：一种二维计算研究，气流制度过去的方形圆柱体在长微型通道限制

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In this paper, the transition between steady and unsteady regimes of the two-dimensional gas flow past a moving square cylinder confined between two parallel plates with equal temperatures was investigated for different subsonic and transonic speeds and blockage ratios B = 3, 5,10 and 20 (B is the ratio between microchannel height and square size). The influence of B on the drag coefficient of the square, pressure at stagnation point and transition between steady and unsteady regime were studied. A set of transition curves were obtained for different blockage ratios. The results showed a similar shape of the neutral curves, which shifts to lower Knudsen and Mach numbers when B decrease. A continuum approach based on the Navier-Stokes-Fourier equations was basically applied to all flow regimes. Navier-Stokes-Fourier equations was calculated numerically by using pressure based finite volume algorithm SIMPLE-TS. For the initial transition velocity slip regime, the results were compared to data obtained by using the particle Direct Simulation Monte Carlo (DSMC) method. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：在本文中，研究了二维气流的稳态和不稳定制度之间的过渡，经过在两个平行板之间限制在具有相等温度的两个平行板之间的移动方圆柱，不同亚音速和跨音速速度，并且阻塞比B = 3,5,10和20（B是微通道高度和方形尺寸之间的比率）。研究了B对平方，停滞点压力和稳态和不稳定地区的过渡的拖拉系数的影响。获得了一组转换曲线以获得不同的封闭比率。结果显示了类似的中性曲线形状，当B减小时转移到下骑士和马赫数。基于Navier-Stokes-Fourier方程的连续方法基本上应用于所有流动制度。利用基于压力的有限卷算法简单-TS计算Navier-Stokes-Fourier方程。对于初始过渡速度滑移制度，将结果与通过使用粒子直接仿真蒙特卡罗（DSMC）方法获得的数据进行比较。 （c）2017年Elsevier Masson SAS。版权所有。

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