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首页> 外文期刊>Ocean Engineering >Numerical study of low-Reynolds-number flow past two tandem square cylinders with varying incident angles of the downstream one using a CIP-based model
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Numerical study of low-Reynolds-number flow past two tandem square cylinders with varying incident angles of the downstream one using a CIP-based model

机译：使用基于CIP的模型对低串联两个下游方的入射角的两个串联方筒的低雷诺数流动的数值研究

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摘要

Two-dimensional flow past two tandem square cylinders with varying incident angles of the downstream one is numerically investigated using an in-house code named the CIP-ZJU model (a Constrained Interpolation Profile based-model in Zhejiang University). The model is built on a Cartesian grid system governed by the Navier Stokes equations using the CIP method for flow solver, and employs an immersed boundary method for the treatment of fluid-structure interactions. Reynolds number in the computation is just set to a constant value of Re=100. In the initial stage of numerical simulation, a shear flow condition is applied to reduce the initial convergence time. The position and incident angle of the upstream cylinder is fixed while incident angle of the downstream one varying from 0 degrees to 45 degrees. The spacing ratio (L/D, L is the streamwise center to center space between two cylinders and D is the square side length) of two cylinders is set at different values of 2, 3, 4, 5, 6 and 7. It is found that there exist two kinds of flow modes with different spacing ratios and incident angles. Particularly at L/D=4, there is a saltation phenomenon of the flow mode when the angle changes from 20 degrees to 25 degrees, which has not been studied before. (C) 2016 Elsevier Ltd. All rights reserved.
机译：使用名为CIP-ZJU模型（浙江大学基于约束插值曲线的模型）的内部代码对经过两个串联的方形气缸的二维流进行了数值研究，这些下游角度具有变化的入射角。该模型建立在由Navier Stokes方程控制的笛卡尔网格系统上，使用CIP方法进行流动求解，并采用沉浸边界方法来处理流固耦合。计算中的雷诺数只是设置为Re = 100的常数。在数值模拟的初始阶段，采用剪切流动条件来减少初始收敛时间。上游气缸的位置和入射角是固定的，而下游气缸的入射角则在0度到45度之间变化。将两个圆柱的间距比（L / D，L是两个圆柱之间的流向中心与中心空间，D是方形边的长度）设置为2、3、4、5、6和7的不同值。发现存在两种流动模式，它们具有不同的间距比和入射角。特别是在L / D ＝ 4的情况下，当角度从20度变化到25度时，存在流动模式的盐化现象，这是以前没有研究过的。 （C）2016 Elsevier Ltd.保留所有权利。

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