Turbulence is often studied by tracking its spatiotemporal evolution and analyzing the
dynamics of its different scales. The dual to this perspective is that of an observer who starts …

Experiments are performed to investigate the effect of nose-tip bluntness on the instability
mechanisms leading to boundary-layer transition on a, the schlieren visualization region is …

An experimental campaign was conducted to examine the impact of an abrupt change in
surface geometry on hypersonic boundary-layer instability waves. The primary test …

A Nomarski polarizing prism has been used in conjunction with a focused laser differential
interferometer to measure the phase velocity of a density disturbance at sampling …

Experiments are performed in a Mach-6 shock tunnel to examine the laminar-to-turbulent
transition process associated with a sudden increase in surface angle on a slender body. A …

The present paper finds that the coexistence of multiple primary instability waves may cause
a non-trivial nonlinear interaction and breakdown process, which has not been reported …

Second-mode instability plays an important role in the transition of a hypersonic boundary
layer. The second-mode wave on a flared cone at Mach 6 has been investigated …

This research effort coordinated by the NATO Science and Technology Organization Applied
Vehicle Technology 240 specialists' group compiles and analyzes second-mode amplitudes …

High-speed boundary-layer transition is extremely sensitive to the free-stream disturbances
which are often uncertain. This uncertainty compromises predictions of models and …

The linear and nonlinear evolutions and breakdown of the second modes in hypersonic
boundary layers (HBLs) on a flared cone are investigated using Rayleigh-scattering flow …