THE study of laminar-to-turbulent transition on surfaces with significant roughness levels has
had a long history motivated by the need to understand transition on realistic surfaces …

THE role of surface roughness in boundary-layer transition is an area of active research.
Ongoing experiments and numerical simulations are addressing issues of roughness …

Two experiments are conducted to investigate transient growth and bypass transition in
boundary layers with moderate-to high-amplitude roughness arrays. Unsteady and …

Laminar flow over a periodic array of cylindrical surface roughness elements is simulated
with an immersed boundary spectral method both to validate the method for subsequent …

Numerical simulations have shown that stationary, spanwise periodic transient disturbances
are capable of suppressing the growth of Tollmien-Schlichting (TS) waves in boundary …

Surface roughness has numerous different effects on boundary layer stability. For roughness
amplitudes lower than a critical level, the velocity disturbances roughness creates in laminar …

Transient growth of linearly stable disturbances is believed to play an important role in the
subcritical transition of laminar boundary layers and the self-sustained nature of boundary …

Current numerical simulations of ice accretion on aircraft wings rely on control-volume
analyses of heat transfer and freezing that do not properly account for the effect of surface …

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Vane-type vortex generators have proven to be well suited for passive aerodynamic control
through their substantial increase in near-wall momentum. As a structurally strong variance …