Destabilizing Free Shear Layers in X-LES Using a Stochastic Subgrid-Scale Model
Destabilizing Free Shear Layers in X-LES Using a Stochastic Subgrid-Scale Model
复制标题
DOI：
10.1007/978-3-642-14168-3_15
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Kok;H. V. D. Ven
中科院分区：
文献类型：
--
作者：
J. Kok;H. V. D. Ven
本文在X-LES法的亚网格尺度模型中引入随机项，以改进湍流自由剪切层的计算。在XLES和类似的des类型方法中，即使使用细网格和高阶数值方法，这些剪切层也可能发展得太慢。对于平面自由剪切层，随机亚网格尺度模型诱导了完全三维湍流的快速发展，而标准方法的流动仍然是纯二维的。并与实验结果以及在ranss - LES界面添加LES含量的区域ranss - LES方法的结果进行了比较。
In this paper, a stochastic term is introduced in the subgrid-scale model of the X-LES method in order to improve the computation of turbulent free shear layers. These shear layers may develop too slowly in XLES and similar DES-type methods, even when fine grids and high-order numerical methods are used. For a plane free shear layer, the stochastic subgrid-scale model induces rapid development of fully 3D turbulence in contrast to the standard method for which the flow remains purely 2D. A comparison is made with experimental results and with results of a zonal RANS–LES method with LES content added at the RANS–LES interface.