Phononic crystals exhibit Bragg bandgaps, frequency regions within which wave
propagation is forbidden. In solid continua, bandgaps are the outcome of destructive …

Bragg scattering in periodic media generates bandgaps, frequency bands where waves
attenuate rather than propagate. Yet, a finite periodic structure may exhibit resonance …

This paper documents progress towards developing a passive boundary layer transition
delay strategy using a phononic subsurface (PSub). High-order implicit large-eddy …

Phononic crystals (PnC) are spatially periodic materials with band gaps that form by Bragg
scattering of elastic waves. Within the frequency range of a band gap, wave propagation is …

The interactions between a solid surface and a fluid flow underlie dynamical processes
relevant to air, sea, and land vehicle performance and numerous other technologies. Key …

In the current work, we numerically study the effect of traveling-wave surface morphing
actuation. Although this actuation strategy has been studied at higher Reynolds numbers for …

The influence of a wall-embedded Helmholtz resonator on the development and stability of
Tollmien–Schlichting (TS) waves is investigated numerically and experimentally for a range …

A novel method for control of convective boundary layer instabilities using metamaterial
concepts is investigated. Attenuation of Tollmien–Schlichting (TS) waves with surface …

View Video Presentation: https://doi. org/10.2514/6.2022-3240. vid The ability to favorably
control unsteady aerodynamic phenomena is key to the design of the next generation of …

Truncation resonances are resonant frequencies that occur within bandgaps and are a
prominent feature of finite phononic crystals. While recent studies have shed light on the …