Abstract

Results are presented of scale-resolving computations of mean and turbulent (including the dissipation rate of turbulent kinetic energy) characteristics of the turbulent wake of a flat plate subjected to adverse pressure gradient (APG). The computations are performed in the framework of a zonal RANS-LES model for two configurations. In the first one, APG is created by a plane symmetric diffuser and in the second one by a system of two pairs of thin liner foils specially designed for this purpose. In the both cases a volumetric synthetic turbulence generator is used for creating turbulent content at the inlet of LES subdomain. High accuracy of results of the simulations is supported by their weak sensitivity to grid-refinement. Obtained detailed data on wakes’ characteristics may be used for validation and improvement of RANS turbulence models as applied to the considered class of flows.

中文翻译：

---

基于LES的逆向压力梯度下湍流尾流演变的计算

摘要

给出了在逆压梯度（APG）下平板的湍流尾迹的均值和湍流（包括湍动能的耗散率）特征的比例解析计算结果。该计算在两种配置的区域RANS-LES模型的框架中执行。在第一个中，APG是由平面对称扩散器产生的，而在第二个中，APG是由两对为此专门设计的薄衬箔的系统产生的。在这两种情况下，均使用体积合成湍流发生器在LES子域的入口处生成湍流成分。模拟结果对网格细化的敏感性较弱，从而支持了模拟结果的高精度。