Vortical Structures in Turbulent Shear Flows and Their Implications for Subgrid Scale Modelling.

9221023 Wallace将对平衡和非平衡湍流边界层进行实验和数值模拟相结合的研究。实验部分将使用研究者先前开发的独特的多元素热丝探针。计划是使用这些仪器的双探头安排来获得两点湍流信息，这些信息表征了有组织湍流结构的空间范围和相干性。需要解决的问题之一是能量从小尺度到大尺度的转移，或反向散射。建模组件旨在将后向散射的影响纳入大涡模拟模型。并行直接数值模拟是对实验的补充。大涡模拟建模是复杂湍流的重要预测工具。许多重要的特征仍然没有被考虑在内，更多的现实主义将允许更准确的工程预测。* * *

9221023 Wallace A combined experimental and numerical modeling investigation is to be conducted on equilibrium and non-equilibrium turbulent boundary layers. The experimental part will utilize unique multi-element hot wire probes previously developed by the investigator. The plan is to use a two-probe arrangement of these instruments to obtain two-point turbulence information which characterize spatial extent and coherence of organized turbulent structures. One of the issues to be addressed is energy transfer from small to large scales, or backscatter. The modeling component is aimed at incorporating the effects of backscatter into Large Eddy Simulation models. Concurrent Direct Numerical Simulations are to complement the experiments. Large Eddy Simulation modeling is an important predictive tool for complex turbulent flows. Many important features are still not accounted for, and more realism will permit more accurate engineering predictions. ***