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Sensitivity Analysis Using Adjoint Parabolized Stability Equations for Compressible Flows

Författare:	Pralits, J. O., Airiau, C., Hanifi, A., Henningson, D.S.H.
Dokumenttyp:	Artikel
Tillstånd:	Publicerad
Tidskrift:	Flow, Turbulence and Combustion, Kluwer
Volym:	65 3/4 321-346
År:	2001

Abstract

The sensitivity of two- and three dimensional disturbances in a compressible boundary layer is investigated for changes in initial condition, wall- and momentum forcing. This is done by using the nonlocal adjoint equations for quasi three-dimensional compressible flow with curvilinear coordinates derived from the parabolized stability equations, PSE. Sensitivity coefficients are given by the adjoint field. Analysis of two-dimensional boundary layers for Mach numbers between 0 and 2.5 show that wall- and momentum forcing close to branch I of the neutral stability curve give the largest amplification at a position downstream of branch II. Forcing at the wall with the wall normal velocity gives the largest amplification. In case of incompressible flow, the two-dimensional disturbances are the most sensitive ones to wall inhomogeneity. For compressible flow, the three-dimensional disturbances are the most sensitive ones. Further, it is shown that momentum forcing is most effectively done in the vicinity of the critical layer.