Receptivity and Transition over Blunt Configurations under Noisy and Quiet Hypersonic Conditions
Abstract
The proposed research focuses on the understanding of the physical mechanisms that lead to laminar-to-turbulent boundary-layer transition (BLT) onset in blunted configurations by using computational fluid dynamics (CFD) simulations and linear and nonlinear, modaland nonmodal, stability analysis calculations. We propose to perform direct numerical simulations (DNS) and stability analysis of blunted geometries at zero and nonzero angle of attack (AoA) for selected bluntness values with and without roughness elements at freestream conditions corresponding to noisy, conventional hypersonic wind tunnel facilities and quiet, hypersonic flight or wind tunnel experiments. For selected conventional wind-tunnel facilities, simplified models for the acoustic disturbances emanated from the turbulent boundary layer (TBL) over the nozzle wall will be sought by reducing the data from existing DNS of nozzle-wall TBLs and by performing additional Reynolds-Averaged Navier-Stokes (RANS) simulations andresolvent analysis. Furthermore, the freestream disturbance spectra from recent measurements of atmospheric turbulence and quiet wind tunnels will be used to simulate BLT under quiet freestream conditions. The objective of these computational studies is to improve the theory and models to better predict BLT onset over hypersonic, blunted configurations of interest to the US Navy during flight with the available limited, noisy and quiet, wind-tunneland flight data.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 15, 2023
- Source ID
- N000142312456
Entities
People
- Pedro Paredes
Organizations
- National Institute of Aerospace
- Office of Naval Research
- United States Navy