Detection of Turbulence Structures and Their Interactions with a Flat Gas-Liquid Interface in Fully-Developed Turbulent Flow

摘要

This study proposes a proper scaling of a vortex indicator for practicalrnidentification of coherent structures (CS) in a turbulent flow with a gasliquidrninterface. The Laplacian of the pressure is scaled by its timespacernaverage and root-mean-square value to introduce a newrnparameterization for effective identification of CS. Numerical turbulentrnflow realizations with the gas-liquid interface obtained by a directrnnumerical simulation technique are employed to confirm suitability ofrnthe proposed scaling. The results of this study indicate that the newlyrnproposed scaling is advantageous in separating all the essential CS fromrndisorganized turbulent background using a unique threshold level,rnespecially in the region adjacent to the gas-liquid interface.