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 sub-grid 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 compari-son 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 Reyn-old complex turbulent flow .
展开▼
