Natural Unsteadiness of the Flow Pattern Around a Plate in Numerical Simulation and Laboratory Modeling

Abstract

The paper presents numerical and experimental study of 2D stratified flow around a strip based on the system of incompressible viscous fluid mechanics equations taking into account stratification and diffusion effects and neglecting heat transfer. The computations show the flow structure is essentially unsteady and multiscale with space-time scales, manifestation degree and attenuation rate of the flow structural elements being significantly affected by variations in values of the basic parameters of the moving body, i.e. size, shape, angle of attack, and movement velocity. For all the problem parameters considered, the laboratory and calculated instantaneous flow patterns indicate a complex unsteady nature of mutual interaction of all the flow components, including waves, vortices, and ligaments, and show a good qualitative agreement of the results of numerical and laboratory modeling.