DNS of Laminar-Turbulent Transition in Separation Bubbles

U. Maucher, U. Rist, M. Kloker and S. Wagner
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U. Maucher: Universität Stuttgart, Institut für Aerodynamik und Gasdynamik
U. Rist: Universität Stuttgart, Institut für Aerodynamik und Gasdynamik
M. Kloker: Universität Stuttgart, Institut für Aerodynamik und Gasdynamik
S. Wagner: Universität Stuttgart, Institut für Aerodynamik und Gasdynamik

A chapter in High Performance Computing in Science and Engineering ’99, 2000, pp 279-294 from Springer

Abstract: Abstract A Laminar Separation Bubble (LSB) is created under the influence of an adverse (positive) pressure gradient along a wall by laminar separation, laminar-turbulent transition and turbulent re-attachment of the flow to the wall. Direct Numerical Simulations (DNS) of the flow in an airfoil boundary layer which are based on solving the full Navier-Stokes equations exhibit good quantitative agreement of the mean-flow data with wind-tunnel experiments, but only examinations of the unsteady results are able to reveal the underlying physics. Thus, a hitherto unknown temporal amplification of three-dimensional small-amplitude disturbances is observed and explained by the entrainment of three-dimensional fluctuations by the roll-up of the detached boundary layer. Once the three-dimensional disturbances become saturated this mechanism leads to a rapid breakdown of the laminar flow into regions of small-scale turbulence which are organized in a quasi two-dimensional coherent manner.

Keywords: Shear Layer; Direct Numerical Simulation; Separation Bubble; Secondary Instability; Linear Stability Theory (search for similar items in EconPapers)
Date: 2000
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-642-59686-5_24

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DOI: 10.1007/978-3-642-59686-5_24

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