Dynamics of Vortex Sheets

9311811将研究小尺度涡旋结构与湍流典型的大尺度含能涡旋之间的关系。已经建立了这种关系的模型，并将加以推广和应用。这种方法是通过小尺度涡旋，它可以被大尺度运动的扭曲所驱动而重新定向、拉伸或压缩。这种方法产生了一个大型的涡流模拟模型。它将与湍流槽道流动的直接数值模拟进行对比试验。这项研究试图使用已知的确定性控制方程作为湍流模型的基础，而不是特别的闭合假设。这可以带来更可靠的湍流模拟能力和更大的适用范围。***

9311811 Pullin An investigation will be carried out of the relation between small scale vortex structures and the large scale energy containing eddies typical of turbulence. A model of this relationship has been developed and is to be extended and applied. The approach is through small scale vortices which can be re-oriented, stretched, or compressed driven by the distortions of the large scale motion. A Large Eddy Simulation model results from this approach. It will be tested against Direct Numerical Simulations of turbulent channel flow. This research is an attempt to use the known deterministic governing equations as a basis for turbulence models, rather than ad hoc closure assumptions. This can lead to a more reliable turbulent flow modeling capability with greater range of applicability. ***