Abstract Fluid dynamics and heat transfer behaviour are studied past side-by-side square cylinders at incidence in vertical flow arrangement numerically considering laminar, Newtonian, steady, incompressible and two-dimensional flow using Finite Volume Method based ANSYS Fluent solver. Using air (Pr = 0.7) as the working fluid, computations are performed at a representative value of Re = 100. The angle of incidence (α) is varied from 0 ° to 45 ° in the step of 5 ° , whereas, the lateral distance between the cylinders is kept constant. To consider all possibilities, cylinders are rotated either clockwise or counter-clockwise, simultaneously or individually, which generates thirty-four different orientations. Buoyancy assisting phenomenon is created by changing the Richardson number (Ri) from 0 to 1 in step of 0.25. Due to the variation of the angle of incidence and its orientations, vortex generation is observed in the buoyancy assisting case at a critical value of Ri. To study heat transfer characteristics, time average and the local Nusselt number are analysed. For a fixed lateral distance between the cylinders, maximum heat transfer is found to occur at an incident angle of 45 ° . Other important parameters, such as drag coefficient (CD), lift coefficient (CL), Strouhal number (St) are also studied.

中文翻译：

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混合对流垂直向上流过并排方圆柱体的入射角

摘要 使用基于有限体积法的ANSYS Fluent求解器，在考虑层流、牛顿流、稳态流、不可压缩流和二维流的情况下，数值研究了垂直流布置中并列方柱体的流体动力学和传热行为。使用空气（Pr = 0.7）作为工作流体，以 Re = 100 的代表值进行计算。入射角（α）以 5° 的步长从 0° 变化到 45°，而横向气缸之间的距离保持恒定。为了考虑所有可能性，圆柱体可以同时或单独地顺时针或逆时针旋转，从而产生 34 个不同的方向。浮力辅助现象是通过以 0.25 的步长将理查森数 (Ri) 从 0 更改为 1 来创建的。由于入射角及其方向的变化，在 Ri 的临界值处在浮力辅助情况下观察到涡流的产生。为了研究传热特性，分析了时间平均值和局部努塞尔数。对于气缸之间的固定横向距离，发现最大热传递发生在 45° 的入射角处。还研究了其他重要参数，例如阻力系数 (CD)、升力系数 (CL)、斯特劳哈尔数 (St)。