Kinetic Treatment of Sources and Mechanisms that Drive Unsteady, Shock-dominated Flow Instability
Abstract
In our present ONR project Multi-scale Modeling of Unsteady Shock- Boundary Layer Hypersonic Flow Instabilities, we have achieved the following research results: (1) confirmed by particle-based simulations the existence of steady spatially inhomogeneous laminar separated flow instabilities at different free stream conditions relevant to Navy configurations, (2) provided slip-flow correctionsthat can be used in continuum models and, (3) extended flow stability analysis in the presence of slip velocities at tip/leading edge and separated flow regions. However, a key, unresolved aspect that has emerged from our work is the pervasive lack of understanding of self-excited instabilities in shock layers and how to best incorporate this behavior in a particle kinetic linear stability approach that will be fully consistent with thermochemical non- equilibrium models. This idea forms a significant kernel of our new research proposal that although highly fundamental will be anchored to realistic flight conditions to establish the free stream conditions and ultimately affect our ability to predict flow receptivity and transition to turbulence. In addition, we propose new work to understand the influence of atmospheric particulates and their influence on unsteady shock dominated flows from a purely, kineticcomputational-particle approach.Approved for public release
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 11, 2023
- Source ID
- N000142312839
Entities
People
- Deborah Ann Levin
Organizations
- Office of Naval Research
- United States Navy
- University of Illinois Urbana–Champaign