Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session H04: Turbulence: Wall-Bounded Flows III: Pipe Flows, Channel Flows and Boundary Layers
8:00 AM–10:10 AM,
Monday, November 22, 2021
Room: North 121 B
Chair: Liuyang Ding, Princeton
Abstract: H04.00010 : A Study of Langmuir Turbulence based on Statistical State Dynamics
9:57 AM–10:10 AM
However, it has also been shown that in turbulent wall bounded shear flows rolls also form by direct destabilization of the roll structure by Reynolds stress torque. Understanding roll formation in the turbulent mixed layer under the influence of both Stokes drift and mean Eulerian shear, in which both the Langmuir modal instability and the Reynolds stress torque induced roll instability are supported, remains to be understood. Because both of these roll formation mechanisms are supported by the associated representation of the dynamics using statistical state dynamics (SSD), a comprehensive understanding of
the roll formation mechanism can be obtained by studying the associated SSD.
By analyzing the SSD we find parameter regimes for which both the Langmuir destabilization mechanism and the Reynolds stress torque mechanism contribute to the formation and maintenance of rolls in mixed layer.
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