Viscous flow around two unequal cylinders is simulated by solving the non-dimensional Navier–Stokes equations. A total of 13 two-dimensional numerical cases are carried out in this study for the flow fields around two adjacent cylinders at Re = 200. The ratio of d / D is equal to 0.25 ( d and D are the diameters of the secondary and primary cylinders, respectively), the distance between two cylinders is kept as a constant ( G = D ), and the angle between them ranges from θ = 0° to θ = 180°. Firstly, six types of wake patterns are proposed and detailedly analyzed for the first time in this study. It is observed that the vortex shedding pattern is dependent on the position of the secondary cylinder. Secondly, this paper systematically analyzes the gap flow features between two cylinders for various angles, including the gap-flow strength, the deflection direction and the deflection mechanism. Additionally, this study also di...

中文翻译：

---

在低雷诺数下，副缸和主缸之间的角度对力系数和流场特性的影响

通过求解无量纲的Navier–Stokes方程来模拟围绕两个不等圆柱体的粘性流动。本研究针对Re = 200时两个相邻圆柱体周围的流场进行了总共13个二维数值计算。d / D之比等于0.25（d和D为次级和初级直径圆柱体），两个圆柱体之间的距离保持恒定（G = D），并且它们之间的角度范围从θ= 0°到θ= 180°。首先，本研究首次提出并详细分析了六种唤醒模式。可以观察到，涡旋脱落图案取决于次级圆柱的位置。其次，本文系统地分析了两个气缸在不同角度下的间隙流动特性，包括间隙流动强度，偏转方向和偏转机构。此外，这项研究还使...