Direct numerical simulation of supersonic turbulent flows over rough surfaces

D Modesti, S Sathyanarayana, F Salvadore… - Journal of Fluid …, 2022 - cambridge.org
We perform direct numerical simulation of supersonic turbulent channel flow over cubical
roughness elements, spanning bulk Mach numbers, both in the transitional and fully rough …

Effects of roughness on a turbulent boundary layer in hypersonic flow

OJH Williams, D Sahoo, M Papageorge, AJ Smits - Experiments in Fluids, 2021 - Springer
Particle image velocimetry experiments were performed to study the effects of surface
roughness on a hypersonic (M ≈ 7.3 M≈ 7.3), flat-plate turbulent boundary layer. Diamond …

Simultaneous turbulent boundary layer velocity profile and scalar turbulence spectra with linear array-FLDI

K Davenport, M Gragston - AIAA Scitech 2022 Forum, 2022 - arc.aiaa.org
View Video Presentation: https://doi. org/10.2514/6.2022-1313. vid In this work, a
configuration of linear array-focused laser differential interferometry (LA-FLDI) is used to …

Supersonic underexpanded jet features extracted from modal analyses of high-speed optical diagnostics

TJ Price, M Gragston, PA Kreth - AIAA Journal, 2021 - arc.aiaa.org
An experimental study concerning an underexpanded, screeching, Mach 1.5 jet operating at
a stagnation-to-ambient pressure ratio of 4.4 is presented. Experimental data were acquired …

Upstream influence in shock wave/transitional boundary layer interactions at Mach 1.8

E Lara Lash, M Gragston, PA Kreth, Z McDaniel… - AIAA journal, 2021 - arc.aiaa.org
This work expands on previous efforts that observed high-intensity resonance in the
dynamic shock motion generated by shock wave/boundary layer interactions with Mach 1.8 …

The effect of near wall disturbances on a compressible turbulent boundary layer

J Gaskins - 2021 - search.proquest.com
This study investigates the effects of near wall disturbances in the form of roughness on a
compressible turbulent boundary layer. The studies were carried out using numerical …

Characterizing surface roughness effects through direct skin friction measurements

D Simmons, RJ Meritt, NJ Molinaro - AIAA AVIATION 2022 Forum, 2022 - arc.aiaa.org
View Video Presentation: https://doi. org/10.2514/6.2022-3925. vid An experimental test
campaign is being conducted to better understand the effects that surface roughness has on …

Separation region unsteadiness drivers in swept compression ramps

DS Allen, KR Langley, JD Schmisseur… - AIAA SCITECH 2023 …, 2023 - arc.aiaa.org
View Video Presentation: https://doi. org/10.2514/6.2023-2490. vid We investigate the
unsteadiness of a 2D and 3D shock-wave/boundary layer interaction (SBLI) and the effect …

Characterizing streamwise development of surface roughness effects on a supersonic boundary layer

BD Kocher, PA Kreth, JD Schmisseur, EJ LaLonde… - AIAA journal, 2022 - arc.aiaa.org
Two-component particle image velocimetry was employed to measure the influence of
surface roughness on a Mach 2 boundary layer. Three surface conditions were examined: a …

Exploration of upstream influence and the role of shock generator geometry in shock wave/transitional boundary layer interactions at Mach 1.8 edge conditions

EL Lash, M Gragston, Z McDaniel, PA Kreth… - AIAA Aviation 2020 …, 2020 - arc.aiaa.org
This work expands on previous efforts that have observed spectral peaks in the dynamic
shock motion generated by shock wave/boundary layer interactions with Mach 1.8 edge …