Abstract
The stability of a laminar separation bubble caused by a sudden decrease of the free stream velocity along a flat-plate is investigated by means of Direct Numerical Simulations based on the complete 3-D Navier-Stokes equations for incompressible unsteady flow and on primary and secondary stability theory. Four cases with different 2-D and 3-D disturbance development are investigated, (i) a linear case, (ii) and (iii) two cases with secondary instability (subharmonic and fundamental resonance), and (iv) a 3-D nonlinear case (oblique breakdown). Due to the strong (mainly primary) amplification of 2-D and 3-D waves in the bubble, secondary instability is hard to identify and plays only a minor role. The oblique breakdown, however yields strong amplification of higher harmonics and a nonlinearly saturated regime with reasonable turbulent mean-flow characteristics.
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© 1994 Springer-Verlag, Berlin Heidelberg
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Rist, U. (1994). Nonlinear Effects of 2-D and 3-D Disturbances on Laminar Separation Bubbles. In: Lin, S.P., Phillips, W.R.C., Valentine, D.T. (eds) Nonlinear Instability of Nonparallel Flows. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-85084-4_28
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DOI: https://doi.org/10.1007/978-3-642-85084-4_28
Publisher Name: Springer, Berlin, Heidelberg
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