DIRECT NUMERICAL SIMULATION OF THE SPATIALLY DEVELOPING TURBULENT MIXING LAYER

Abstract

A direct numerical simulation of transitional and developed turbulent flow in a three-dimensional spatially developing subsonic mixing layer is performed. The streamwise, normal and spanwise momenta are sampled at characteristic locations in the flow. The corresponding correlation time is computed in the turbulent regime and compared to the averaging time needed to obtain sufficiently accurate time-averaged flow quantities. Some resulting probability density functions are shown and discussed.