Laminar-Turbulent Transition in a Laminar Separation Bubble: Influence of Disturbance Amplitude on Bubble Size and Bursting

Olaf Marxen
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Olaf Marxen: Stanford University, Center for Turbulence Research

A chapter in High Performance Computing in Science and Engineering `07, 2008, pp 261-275 from Springer

Abstract: Abstract Direct numerical simulations of a short laminar separation bubble and its bursting are carried out. The bubble is developing on a flat plate due to an externally imposed pressure gradient. Laminar-turbulent transition is triggered by small disturbance input with fixed frequency to keep the bubble short. The short bubble reaches a statistically steady state, while switching off disturbance input yields a growing separation bubble. This phenomenon is denoted as bubble-bursting process. Disturbance input does not only prevent bursting, but can also serve to control the short bubble. Bubble size decreases with increased disturbance amplitude. Performance data on a NEC SX-8 super computer are compared for two different resolutions.

Keywords: Direct Numerical Simulation; Vortical Structure; Disturbance Input; Linear Stability Theory; Direct Numerical Simulation Result (search for similar items in EconPapers)
Date: 2008
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-540-74739-0_18

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DOI: 10.1007/978-3-540-74739-0_18

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