Summary
Laminar-turbulent transition in a 3-D boundary layer under controlled simultaneous forcing of unstable steady and unsteady crossflow waves is investigated by means of direct numerical simulations. The flow configuration reproduces the accelerated 3-D flat-plate boundary layer of the “Querströmungsprinzipexperiment” of the DLRGöttingen [1]. The superposition of high-amplitude steady and unsteady waves induces a spanwise and streamwise modulation of the flow, which is shown to trigger the laminar breakdown also in the absence of additional background disurbances. The mechanism has some similarities to the one documented for the case of purely steady vortices [6] [8]. However the interaction of the primarily perturbed waves provides both the preconditions and the forcing for such mechanism.
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Bonfigli, G., Kloker, M. (2004). Secondary instability of superposed steady and unsteady crossflow vortices. In: Breitsamter, C., Laschka, B., Heinemann, HJ., Hilbig, R. (eds) New Results in Numerical and Experimental Fluid Mechanics IV. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 87. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39604-8_21
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DOI: https://doi.org/10.1007/978-3-540-39604-8_21
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