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首页> 外文期刊>Journal of Hydrodynamics >NUMERICAL STUDY OF VORTEX SHEDDING FROM A SQUARE CYLINDER AND ITS EFFECTS ON HEAT TRANSFER OF MIXED CONVECTION
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NUMERICAL STUDY OF VORTEX SHEDDING FROM A SQUARE CYLINDER AND ITS EFFECTS ON HEAT TRANSFER OF MIXED CONVECTION

机译：方形圆柱体涡旋切缝及其对混合对流传热影响的数值研究

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摘要

The influence of buoyancy on vortex shedding from a heated square cylinder and its effects on the heat transfer of mixed convection were simulated. The flow equations, based on the velocity and the pressure, were solved along with the energy equation by a modified SIMPLER algorithm - the Quick Scheme and small Control Volume (QSCV) algorithm developed by the authors of the present paper. A set of optimized computational domain and artificial lateral boundary conditions were used along with the QSCV algorithm. Several cases were simulated for the Grashof numbers up to 1. 8 X 10~5, the Reynolds numbers up to 500, and a range of angles between free stream velocity and gravity from 0 to 1.5π. In opposing flow, the results distinguish two different flow patterns: periodic flow for Gr < Gr_c and steady flow with attached twin vortices for Gr > Gr_c, and a precise correlation between Gr_c and Re expressed as Gr_c = 0. 00166(Re)~(2.97795) for Re up to 500 was firstly obtained. In cross flow, it could be seen that the Ri = Gr/Re~2 plays a great role in the wake vortex patterns and the temperature fields. In aiding flow, it is found that the main flow currents cause a large expansion of the streamlines and isotherms in the direction normal to the free stream velocity. These changes in the wake vortex patterns and the temperature fields greatly modify the heat flux along the surface of the square cylinder and consequently, the heat transfer rate is strongly dependent upon the Reynolds numbers, the Grashof numbers, and the gravity direction.
机译：模拟了浮力对加热的方筒涡旋脱落的影响及其对混合对流换热的影响。通过改进的SIMPLER算法-由本文作者开发的快速方案和小控制量（QSCV）算法，将基于速度和压力的流动方程与能量方程一起求解。一组优化的计算域和人工横向边界条件与QSCV算法一起使用。模拟了几种情况，Grashof数最大为1。8 X 10〜5，雷诺数最大为500，自由流速度和重力之间的夹角范围为0到1.5π。在反向流动中，结果区分出两种不同的流动模式：Gr Gr_c的具有附加双涡旋的稳定流动，以及Gr_c和Re之间的精确相关性表示为Gr_c =0。00166（Re）〜（首次获得Re最高为2.97795。在错流中，可以看出，Ri = Gr / Re〜2在尾流涡旋图和温度场中起着重要作用。在辅助流动中，发现主流流动导致流线和等温线在垂直于自由流速度的方向上大膨胀。尾流涡流模式和温度场的这些变化极大地改变了沿方圆柱体表面的热通量，因此，传热速率强烈取决于雷诺数，格拉斯霍夫数和重力方向。

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