Large Eddy Simulation of Spatially Developing Turbulent Mixing Layer

Abstract

The aim of this study is to clarify the coherent vortical structure in a turbulent mixing layer and the relation between pressure fields and vortical fields. To achieve this purpose, we simulated the spatially developing turbulent mixing layer by using a large eddy simulation. From these numerical simulations, the following conclusions are obtained: 1) Two-dimensional coherent vortical structure exists in a high Reynolds number turbulent mixing layer: 2) During the development of the mixing layer, two-dimensional coherent vortical structures merge and their scales become large: 3) Pressure fields are closely related to the vortical structure, and the negative pressure field relative to the mean value corresponds to the spanwise vortical structure.