Turbulence structure analysis of DNS data using DMD and SPOD: Mixing jet and channel flow

Abstract

The objectives of this work are to analyze and investigate the turbulence structures in a channel flow and in a mixing jet using Dynamic Mode Decomposition (DMD) and Snapshot Proper Orthogonal Decomposition (SPOD). The analyzed data have been generated by Direct Numerical Simulation at high Reynolds numbers. In the channel flow, the occurrence of turbulent superstructures is mainly examined. The jet case is employed to investigate mixing in a turbulent jet flow. In both cases, DMD and SPOD analysis are compared to test their performance concerning the analysis of complex flows and to highlight the complementarity between these two approaches.