Identification and analysis of very-large-scale turbulent motions using multiscale proper orthogonal decomposition
Cheng Chi, Dominique Thévenin, Alexander J. Smits, Steve Wolligandt, Holger Theisel
Abstract
A multiscale proper orthogonal decomposition (mPOD) has been used to decompose the multiscale features of very long turbulent channel flow. The very-large-scale motions (VLSM) can be clearly visualized, even for flow at relatively low Reynolds number. A new energetic mode, called eVLSM, has been identified, which contains substantial energy. The large-scale structures (apart from eVLSM) are inclined to the streamwise direction and appear to be responsible for the typical meandering behavior or even for the breakup of VLSM.
Topics & Concepts
TurbulenceProper orthogonal decompositionBreakupScale (ratio)Reynolds numberStatistical physicsDynamic mode decompositionFlow (mathematics)DecompositionMechanicsScale analysis (mathematics)Computer sciencePhysicsMathematicsEcologyBiologyQuantum mechanicsFluid Dynamics and Turbulent FlowsFluid Dynamics and Vibration AnalysisModel Reduction and Neural Networks