Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session Q28: Flow Instability: Rayleigh-Taylor/Richtmyer-Meshkov III
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B316
Chair: Jacob McFarland, University of Missouri
Abstract ID: BAPS.2018.DFD.Q28.3
Abstract: Q28.00003 : Mixing layer growth from localized perturbations*
1:16 PM–1:29 PM
Presenter:
Britton Olson
(Lawrence Livermore Natl Lab)
Authors:
Britton Olson
(Lawrence Livermore Natl Lab)
Robin Williams
(AWE)
We study the growth of Richtmyer-Meshkov mixing layers from an initial surface with spatially localized perturbations. We use two symmetric forms of the initial patch, which allow simulation data to be averaged to generate a two-dimensional statistical representation of the three dimensional turbulent flow. We find that as the mixing layer grows, the turbulent structures tend to form into discrete packets separated from the surface, with material entrainment into them dominated by a laminar entrainment flow inward from the surrounding regions where the surface was originally smooth. The entrainment appears to be controlled by the propagation of vortex pairs which appear at the boundary of the region of initial perturbations. This suggests that the growth of RM mixing from isolated features, as may be found in manufactured Inertial Confinement Fusion capsules, has a rather different mechanism than the growth of an RM mixing layer when the perturbations are uniform. This may be a challenge for some existing engineering models to accurately capture.
*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q28.3
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