Accurate prediction of boundary layer transition is extremely important for the aerodynamic
and aerothermodynamic design of a hypersonic vehicle. Crossflow instability plays a crucial …

View Video Presentation: https://doi. org/10.2514/6.2021-0743. vid Direct Numerical
Simulations (DNS) were carried out in order to investigate laminar-turbulent boundary-layer …

Although low-disturbance (“quiet”) hypersonic wind tunnels are believed to provide more
reliable extrapolation of boundary-layer transition behavior from ground to flight, the …

A random forcing approach was implemented into a high-order accurate finite-difference
code in order to investigate 'natural'laminar–turbulent transition in hypersonic boundary …

A novel optical method is used to measure the high-frequency (up to 3 MHz) density
fluctuations that precede transition to turbulence within a laminar boundary layer in a …

Boundary-layer transition was studied on a sharp 7 deg cone in two hypersonic wind tunnels
at Mach numbers of 5, 6, 8, and 14 over a range of freestream Reynolds numbers between …

A thermoacoustic interpretation of Mack's second-mode instability is proposed. It is
demonstrated that the fundamental mechanism of second-mode wave growth in hypersonic …

This paper presents new methodologies based on Mack's amplitude method to estimate the
start of transition in hypersonic wind tunnels when the second mode dominates the transition …

Hypersonic boundary-layer transition can be caused by many different mechanisms. This
research focuses on studying the growth and breakdown of the second-mode instability …

Boundary-layer transition in hypersonic flows over a straight cone can be predicted using
measured freestream spectra, receptivity, and threshold values for the wall-pressure …