Spatial Direct Numerical Simulation of Transition Phenomena in Supersonic Flat-Plate Boundary Layers
Direct Numerical Simulations (DNS) are carried out for flat-plate boundary layers at Ma = 2.0 and 6.8 to investigate subharmonic combination-mode phenomena caused by the interaction of two three-dimensional disturbance waves with fundamental and subharmonic frequency. An unexpected long growth of the nonlinearly generated subharmonic combination mode is observed which is independent of the disturbance amplitudes. The relevance of the subharmonic modes for transition is examined by comparison with a pure oblique-type breakdown scenario.
KeywordsVortex Vorticity Eter Triad
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- 1.H. Bestek and W. Eißler. DNS of Transition in Mach 4.8 Boundary Layers at Flight Conditions. In G. Bergeles W. Rodi, editor, Engineering Turbulence Modelling and Experiments 3. Elsevier Science B.V., 1996.Google Scholar
- 2.A. Fezer and M. Kloker. Transition processes in Mach 6.8 boundary layers at varying temperature conditions investigated by spatial direct numerical simulation. In W. Nitsche and R. Hilbig, editors, Notes on Numerical Fluid Mechanics. 11th Stab Symposium 98, Berlin, Vieweg Verlag, 1999.Google Scholar
- 3.M. Kloker. A Robust High-Resolution Split-Type Compact FD-Scheme for Spatial Direct Numerical Simulation of Boundary-Layer Transition. In Applied Scientific Research 59 (.4), pages 353–377. Kluwer Acad. Publishers, NL, 1998.Google Scholar
- 4.A.D. Kosinov, N.V. Semionov, S.G. Shevelkov, and O.I. Zinin. Experiments on the nonlinear instability of supersonic boundary layers. In S.P. Lin, W.R.C. Phillips, and D.T. Valentine, editors, Nonlinear Instability of Nonparallel Flows, pages 196–205. Springer-Verlag, Berlin, 1993.Google Scholar