Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X16: Supersonic and Hypersonic I
8:00 AM–10:36 AM,
Tuesday, November 21, 2023
Room: 145A
Chair: Mario Di Renzo, University of Salento
Abstract: X16.00005 : Free-stream disturbance receptivity and amplification at hypersonic speeds by adjoint Green’s function*
8:52 AM–9:05 AM
Presenter:
Tim J Flint
(Center for Turbulence Research, Stanford University)
Authors:
Tim J Flint
(Center for Turbulence Research, Stanford University)
Parviz Moin
(Center for Turbulence Research, Stanford University)
A new physically motivated scaling for transition location on blunt cones in tunnel tests is shown to collapse several experimental datasets in the absence of transition reversal. This scaling supports transient growth as the transition mechanism, even when approaching the sharp limit, contrary to traditional wisdom.
The discrepancy between transition in flight and in tunnel tests is addressed by answering the question of how fluctuations in the free-stream are transported into the boundary layer and amplified on a blunt cone. The receptivity and amplification of a disturbance that arrives at a point near transition is directly computed by way of the adjoint Green’s function. The adjoint Green’s function provides a quantitative account of all possible linear receptivity and amplification mechanisms in a way that is agnostic to a particular choice of free-stream disturbance field.
*This research has been supported by NASA and the Franklin P. and Caroline M. Johnson Fellowship in the School of Engineering Fund at Stanford University.
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