The roughness-shielding concept involves reducing the receptivity of large-amplitude
discrete roughness elements (DREs) by surrounding them with subcritical distributed …

This paper explores the mechanisms underlying roughness induced transition (RIT) caused
by discrete roughness elements (DREs) using immersed boundary direct numerical …

The present work is dedicated to the investigation of the effect of an isolated roughness
element on a swept wing boundary layer. In particular, the flow modifications incurred by a …

The presented work introduces a cancellation technique, based on the linear superposition
of stationary crossflow instabilities (CFIs) through the application of a streamwise series of …

Mechanisms that ultimately lead to the enhanced wall shear stress toward the end of
transition to turbulence in a zero-pressure gradient boundary layer are examined for two …

The physical mechanisms of roughness-induced transition (RIT) in pressure gradient
boundary layers are studied using direct numerical simulations. Recent investigations have …

Turbulent spots are regions of turbulence surrounded by laminar flow that appear during the
late stages of boundary layer transition. While turbulent spots are often studied in isolation …

We have recently demonstrated, using experiments and DNS, how boundary layer transition
caused by a single discrete roughness element (DRE) can be inhibited by appropriate …

The fundamental mechanism of turbulent wedge spreading is investigated using combined
naphthalene flow visualization and hotwire measurements. The lateral spreading rate of tur …

Laminar to turbulent transition is an important unsolved problem. In addition to being of
fundamental interest as a fluid mechanics problem, it has practical applications dealing with …