基于全局动态Vreman模型的复杂非定常湍流的大涡模拟  

Dynamic global Vreman model for large eddy simulation of transient turbulent flow in complex geometry

作　　者：王文全[1] 闫妍[1] 张立翔[1] 郭亚昆[2] 

机构地区：[1]昆明理工大学工程力学系,昆明650500 [2]阿伯丁大学工程系

出　　处：《计算力学学报》2014年第5期628-633,共6页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(11002063;11262008)

摘　　要：在湍流数值模拟方法中,大涡模拟方法可以提供丰富的大涡旋信息,已逐渐成为复杂湍流问题数值研究的重要方法。而大涡模拟中,最重要的一环是尽量准确地构建能反映流场物理本质特征的亚格子应力模型。基于该思想,将一种新型的大涡模拟亚格子应力模型-Vreman亚格子应力模型用于高雷诺数三维后台阶流动的求解,计算结果与实验结果进行对比分析结果较吻合,验证了该模型的可靠性。这是对该模型用于无任何均匀流动方向的高雷诺数复杂湍流非定常流动的首次检验,计算结果优于基于传统的Smagorinsky涡粘性的动态亚格子模型。In the method for turbulent numerical simulation,the large eddy simulation （LES） method can provide abundant information for a large vortex, so it has gradually become an important method in the turbulent numerical simulation of the complex geometry and will continue to develop. To construct subgrid stress model as accurately as possible to reflect the physical nature of the flow field characteristics is the most important issue for LES. Based on such a thought, the subgrid-scale （SGS） eddy-viscosity model developed by Vreman is tested in an Re= 28,000 backward-facing step turbulent flow by comparison to the experimental data. The new LES framework yields excellent agreement for the mean velocity and matches experimental data better than the traditional Smagorinsky-based SGS model. This appears to be the first test of this class of model to flows without any homogeneous flow directions and high Reynold complex turbulent flow.

关 键 词：大涡模拟 有限体积法 后台阶流动 Vreman模型 Smagorinsky模型 

分 类 号：O357.5[理学—流体力学]