Wall-layer models for large eddy simulation of complex flows

大涡模拟(LES)是预测复杂湍流流动的最有前途的方法。通过解析波动的数量，大涡模拟有可能成为一种广泛使用的具有实际意义的流动模拟工具。目前，大涡模拟在高雷诺数复杂流动中的应用受到其高分辨率要求的限制，这些要求是由于需要分辨内壁层而存在的。连接墙层的模型能够解决这一难题--但目前可用的墙模型受到严重的限制。这一建议的目的是改进现有的壁面模型，并开发新的壁面模型，用于复杂、高雷诺数流动的大涡模拟。研究将集中在压力诱导的分离和再附着以及流向曲率、轴向涡量和可压缩性的影响。它将从对现有方法和申请者最近提出的方法进行仔细的先验测试开始。所使用的数据将基于分辨率良好的直接数值模拟(DNS)。根据在这些测试中取得的经验，将对这个法德研究小组内通常定义的测试用例进行后验测试，以便将所开发的方法与研究小组其他成员开发的互补方法进行详细比较。

Large Eddy Simulation (LES) is the most promising approach for the prediction of complex turbulent flows. By resolving fluctuating quantities, LES has the potential to become a widely used simulation tool for flows of practical relevance. Currently, the use of LES for high Reynolds number complex flows is limited by its extraordinary resolution requirements that are present due to the need to resolve the inner wall layer. Models bridging the wall layer are able to solve this resolution dilemma - but currently available wall models suffer from severe constraints. lt is the aim of this proposal to improve existing and to develop novel wall models for LES of complex, high Reynolds number flows. The research will focus on pressure induced separation and reattachment and on the effects of streamwise curvature, axial vorticity and compressibility. It will start from careful a priori testing of existing approaches and an approach, recently proposed by the applicants. The data used will be based on well resolved Direct Numerical Simulations (DNS). Based on the experiences made during these test, a posteriori testing will be made on test cases commonly defined within this French-German research group thus allowing for detailed comparisons of the developed approaches with complementary methods developed by the other members of the research group.