Efficient implicit LES method for the simulation of turbulent cavitating flows
Efficient implicit LES method for the simulation of turbulent cavitating flows
复制标题
DOI：
10.1016/j.jcp.2016.04.021
复制
发表时间：
2016-07
期刊：
影响因子：
--
通讯作者：
Christian P. Egerer;S. Schmidt;S. Hickel;N. Adams
中科院分区：
文献类型：
--
作者：
Christian P. Egerer;S. Schmidt;S. Hickel;N. Adams
基于隐式亚网格尺度模型，提出了一种有效模拟含空化的可压缩液体大涡流动的数值方法。相变和亚网格尺度的界面结构采用假设局部热力学平衡的均匀混合模型来模拟。与以前的方法不同，重点是在一个小的模板上操作（最多四个细胞）。离散化的截断误差被设计为湍流的物理一致性亚网格尺度模型。我们制定了一个传感器函数，用于检测均匀混合模型中的激波或伪相边界，以局部化数值耗散。在流场的光滑区域，采用一种形式非耗散的中心离散化方案，结合正则化项来模拟未解析子网格尺度的影响。通过计算标准的单阶段和两阶段测试用例对新方法进行了验证。通过对湍流空化混合层计算结果的比较，证明了新方法的适用性。
We present a numerical method for efficient large-eddy simulation of compressible liquid flows with cavitation based on an implicit subgrid-scale model. Phase change and subgrid-scale interface structures are modeled by a homogeneous mixture model that assumes local thermodynamic equilibrium. Unlike previous approaches, emphasis is placed on operating on a small stencil (at most four cells). The truncation error of the discretization is designed to function as a physically consistent subgrid-scale model for turbulence. We formulate a sensor functional that detects shock waves or pseudo-phase boundaries within the homogeneous mixture model for localizing numerical dissipation. In smooth regions of the flow field, a formally non-dissipative central discretization scheme is used in combination with a regularization term to model the effect of unresolved subgrid scales. The new method is validated by computing standard single- and two-phase test-cases. Comparison of results for a turbulent cavitating mixing layer obtained with the new method demonstrates its suitability for the target applications.