Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Unsteady Vortex Dynamics Past a Uniformly Moving Tilted Plate
Y. D. Chashechkin, I. V. Zagumennyi, N. F. Dimitrieva
Abstract:
In the present paper, stratified fluid flows past a uniformly moving tilted plate are studied numerically at transient vortex regime based on the fundamental system of differential equations for incompressible stratified fluid. Numerical simulation of the problem is implemented using dynamic mesh libraries and unique solvers of own development in frame of the OpenFOAM package with open source. Unsteady patterns of flow vortex structure past a moving plate are thoroughly studied and analysed at different tilt angles of the plate with a purpose to grasp the general multiscale process of flow evolution over time at the initial stage of the flow formation. Based on observations of the unsteady flow patterns and evaluations of spatial and temporal scales of the vortex elements, as well as their geometrical features, manifestation level, and dissipation rate, a number of vortex flow regimes are distinguished depending on a value of tilt angle of the plate to horizon. A particular attention is paid to studying the flow fine structure which is a key for explaining plenty of natural phenomena still not clearly understood.
Keywords:
stratified flow, tilted plate, vortices, vortex sheet, fine structure, OpenFOAM

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2018.007

In Proceedings Topical Problems of Fluid Mechanics 2018, Prague, 2018 Edited by David Šimurda and Tomáš Bodnár, pp. 47-56 ISBN 978-80-87012-65-9 (Print) ISSN 2336-5781 (Print)