Dynamics of Vortex Sheets

本文将研究小尺度涡旋结构与典型湍流的大尺度含能涡旋之间的关系。这种关系的模式已经形成，并将得到推广和应用。该方法是通过小尺度涡旋，这些涡旋可以在大尺度运动的扭曲驱动下重新定向、拉伸或压缩。用这种方法得到了一个大涡模拟模型。它将与湍流通道流动的直接数值模拟进行测试。本研究尝试使用已知的确定性控制方程作为湍流模型的基础，而不是临时的封闭假设。这可以导致更可靠的湍流建模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. ***