Coherent structures associated with interscale energy transfer in turbulent channel flows
Hongping Wang, Zixuan Yang, Ting Wu, Shizhao Wang
Abstract
The flow fields of direct numerical simulation of turbulent channel flow are decomposed into large scales and small scales based on the interscale energy transfer spectra. The former is characterized by streaks and quasi-streamwise vortices even in the outer layer, and the latter is characterized by hairpin-like vortical structures that are similar to the original flow fields. We further investigated the coherent structures associated with the real-space energy transfer. The formation of small-scale hairpin-like vortices is related to the large-scale shear layer.
Topics & Concepts
TurbulenceVortexLagrangian coherent structuresOpen-channel flowFlow (mathematics)PhysicsMechanicsEnergy transferSpace (punctuation)Channel (broadcasting)Scale (ratio)Energy (signal processing)Shear (geology)GeometryGeologyMathematicsComputer scienceTelecommunicationsMolecular physicsPetrologyQuantum mechanicsOperating systemFluid Dynamics and Turbulent FlowsFluid Dynamics and Vibration AnalysisPlant Water Relations and Carbon Dynamics