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

Flow Over a Square Cylinder with an Attached Cambered Flexible Wake Splitter
A. Kamal Raj Sharma, B. Sushanta Dutta
Abstract:
Particle Image Velocimetry (PIV) study is performed to analyse the effects of flow over a cambered flexible wake splitter attached to the lee side of a square cylinder at an intermediate Reynolds number (ReD = 600, where D is the blocking width of the cylinder). The study shows that the cambered flexible wake splitter (length, L = 8D) undergoes vortex induced, asymmetric low amplitude flapping due to which near wake becomes slightly asymmetric. The flexible film increases the centre line celerity in the wake by transferring momentum to the fluid downstream and reduces the wake width due to less entrainment of free stream fluid. Wake splitters beyond a particular length, interact with the primary vortices and shed secondary vortices on either side of the wake splitter due to Coanda effect. In the present study, shedding of asymmetric secondary vortices is observed which owes to the increased pressure in the lower wake envelope due to asymmetric flapping of the cambered splitter. The study indicates towards the positive lift generation due to asymmetric flapping of the cambered film.
Keywords:
cambered flexible wake splitter, fluid structure interaction, PIV, square cylinder

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2019.016

In Proceedings Topical Problems of Fluid Mechanics 2019, Prague, 2019 Edited by David Šimurda and Tomáš Bodnár, pp. 109-116 ISBN 978-80-87012-69-7 (Print) ISSN 2336-5781 (Print)