Flow around a step cylinder at the Reynolds number 150 was simulated by directly solving the full Navier-Stokes equations. The configuration was adopted from the work of Morton and Yarusevych [“Vortex shedding in the wake of a step cylinder,” Phys. Fluids 22, 083602 (2010)], in which the wake dynamics were systematically described. A more detailed investigation of the vortex dislocation process has now been performed. Two kinds of new loop vortex structures were identified. Additionally, antisymmetric vortex interactions in two adjacent vortex dislocation processes were observed and explained. The results in this letter serve as a supplement for a more thorough understanding of the vortex dynamics in the step cylinder wake.

中文翻译：

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阶梯圆柱体后尾流中的反对称涡旋相互作用

通过直接求解完整的 Navier-Stokes 方程来模拟雷诺数为 150 的步进圆柱体周围的流动。该配置是从 Morton 和 Yarusevych 的工作中采用的 [“步进圆柱体后的涡流脱落”，Phys. Fluids 22, 083602 (2010)]，其中系统地描述了尾流动力学。现在已经对涡流位错过程进行了更详细的研究。确定了两种新的环涡结构。此外，观察并解释了两个相邻涡流位错过程中的反对称涡流相互作用。这封信中的结果可作为对步进圆柱尾流中涡流动力学更透彻理解的补充。