Three-Dimensional Disturbances in High Speed Boundary Layer Flows.
Abstract
This report summarizes developments on a new theory which was devised to identify and describe the cause of pronounced spanwise-periodic disturbances observed in reattaching separated flows. This theory was subsequently extended to include surface mass transfer effects and the coupling of the boundary layer disturbances and adjacent surface material thermal and ablative response of the body surface. It was shown for the first time that a similar three-dimensional phenomenon can occur near the separation line of a high speed boundary layer. In parallel, the theoretical study of reattachment stagnation region 3-D vortices which was refined using a systematic inner-outer match asymptotic analysis approach appropriate to finite-sized bodies is described. A very careful detailed formulation of the associated boundary value problem for the case of a cylinder and its detailed numerical treatment (which also required great effort and care) has nearly been completed. Finally, a new turbulent viscous-disturbance sublayer theory which was developed as the inner deck of a generalized non-asymptotic triple-deck theory of two-dimensional turbulent shock interaction problems in both transonic and supersonic flows is discussed. This theory provides a much improved theoretical account of the skin friction, upstream influence and displacement thickness growth in a wide variety of such problems. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1981
- Accession Number
- ADA120251
Entities
People
- George R. Inger
Organizations
- Virginia Tech