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.
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Maucher, U., Rist, U., Kloker, M., Wagner, S. (2000). DNS of Laminar-Turbulent Transition in Separation Bubbles. In: Krause, E., Jäger, W. (eds) High Performance Computing in Science and Engineering ’99. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-59686-5_24
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DOI: https://doi.org/10.1007/978-3-642-59686-5_24
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-64084-1
Online ISBN: 978-3-642-59686-5
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