Theoretical and Computational Studies of Stability, Transition and Flow Control in High-Speed Flows
Abstract
Theoretical and computational studies of stability in high-speed boundary layers have been carried out with an emphasis on the multimode decomposition including nonparallel flow effects. The multimode decomposition can serve to analysis of DNS results for transitional boundary layers. It is shown that using the biorthogonal eigenfunction system, one can compare DNS results with theoretical predictions for the unstable and stable modes. Application of the multimode decomposition required re-evaluation of discrete modes branching and clarification of the terminology issues. Depending on flow parameters, the spectrum may have two unstable modes that are associated with inviscid instabilities of Mack first and second modes. With another choice of the parameters, the spectrum may have only one unstable mode having two maxima. Effect of chemical reactions in binary mixtures of oxygen and nitrogen has been studies within the inviscid stability analysis. In addition to the studies of high-speed boundary layers, fundamental aspects were addressed to evaluate foundations of global (bi-global) stability concept.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 22, 2011
- Accession Number
- ADA547191
Entities
People
- Anatoli Tumin
Organizations
- University of Arizona