Modelling of turbulence-interface interactions in stratified two-phase flows

21st Fluid Mechanics Conference

物理学;力学

Waclawczyk, T.^1 ; Waclawczyk, M.^2 ; Kraheberger, S.V.^2

Institute of Numerical Methods in Mechanical Engineering, Department of Mechanical Engineering, TU Darmstadt, Dolivostr. 15, 64293 Darmstadt, Germany^1

Department of Mechanical Engineering, TU Darmstadt, Otto-Berndt-Str. 2, 64287 Darmstadt, Germany^2

关键词: Characteristic size;    Ensemble-averaged;    Interface interaction;    Intermittency function;    Numerical solution;    Sharp interface;    Surface positions;    Turbulent kinetic energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/530/1/012050/pdf
DOI  :  10.1088/1742-6596/530/1/012050

学科分类：力学，机械学

来源: IOP

【 摘 要 】

In this work we describe interactions between turbulence and water-air surface in the ensemble-averaged picture where, instead of a sharp interface between the phases we deal with a surface layer where the probability of the surface position is nonzero. Changes of the turbulent kinetic energy and the characteristic size of the eddy influences the width of the surface layer. We present a numerical solution of the equation for the intermittency function which describes the probability of finding the water phase at the given point and time.