M<scp>ECHANISMS ON</scp> T<scp>RANSVERSE</scp> M<scp>OTIONS IN</scp> T<scp>URBULENT</scp> W<scp>ALL</scp> F<scp>LOWS</scp>

Abstract

▪ Abstract Drag reduction in wall-bounded flows can be achieved by transverse motions imposed by passive means, e.g., riblets, or by external forcing, such as wall oscillation or transverse traveling-wave excitation. In this article, we review possible physical mechanisms responsible for turbulent drag reduction and corresponding near-wall flow modification.