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Large Eddy Simulations of flow around a smooth circular cylinder in a uniform current in the subcritical flow regime

机译：亚临界流动状态下均匀电流下光滑圆柱体绕流的大涡模拟

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摘要

Three-dimensional flow around a circular cylinder in a steady, uniform current at subcritical Reynolds numbers (Re) is investigated. The flow is simulated using Large Eddy Simulations (LES) with Smagorinsky subgrid scale model. Influences of various numerical parameters are investigated through the statistical values of the drag and the lift coefficients, Strouhal number, pressure distribution and separation angles, as well as through the flow field in the cylinder near wake. The main purpose of the paper is to study the flow around a circular cylinder at Re= 13,100, which is chosen due to its applicability to the flow around cylindrical offshore structures in operational conditions, and because it belongs to a not thoroughly studied Re range. However, first the flow around a cylinder in the free stream at Re=3900 is investigated and the results are compared with numerous published results for validation of the chosen LES model. For the higher Re, the results are compared with the published experimental data and the numerical simulations for the similar flow regime. The chosen LES performs well. The results are in reasonably good agreement with previous studies and are discussed through standard hydrodynamic parameters and details of the flow around the cylinder and in the wake.
机译：研究了在亚临界雷诺数（Re）下以稳定，均匀的电流围绕圆柱的三维流动。使用大型涡流模拟（LES）和Smagorinsky子网格比例模型对流进行模拟。通过阻力和升力系数，斯特劳哈尔数，压力分布和分离角的统计值，以及通过靠近尾流的气缸中的流场，研究了各种数值参数的影响。本文的主要目的是研究Re = 13,100时圆柱体周围的流动，之所以选择它是因为它适用于工作条件下的圆柱形海上结构周围的流动，并且因为它属于尚未深入研究的Re范围。但是，首先研究自由流中Re = 3900处圆柱体周围的流动，并将结果与​​大量公开的结果进行比较，以验证所选的LES模型。对于更高的Re，将结果与已发布的实验数据和相似流态的数值模拟进行比较。选择的LES表现良好。结果与先前的研究相当吻合，并通过标准流体力学参数以及圆柱体周围和尾流的细节进行了讨论。

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