Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session T25: Flow Instability: Geophysical and Kelvin-Helmholtz
4:25 PM–6:09 PM,
Monday, November 20, 2023
Room: 150B
Chair: Marek Stastna, University of Waterloo
Abstract: T25.00001 : Transient growth in magnetohydrodynamic shear layers*
4:25 PM–4:38 PM
Presenter:
Adrian E Fraser
(University of Colorado, Boulder)
Authors:
Adrian E Fraser
(University of Colorado, Boulder)
Alexis K Kaminski
(UC Berkeley)
Jeff S Oishi
(Bates College)
Here, we show that nonmodal growth remains significant in magnetized shear flows. We study a simple shear layer with a uniform magnetic field in the MHD limit. When the field is strong enough to suppress the Kelvin-Helmholtz (KH) instability, the same nonmodal effects that drive turbulence in neutral fluids also drive significant linear growth here. This growth increases dramatically in domains much larger than the typical KH lengthscale. This demonstrates that modal analyses can be misleading when used to assess stability of MHD shear flows and that simulations in small domains may miss crucial dynamics.
*NASA HTMS grant 80NSSC20K1280, and the George Ellery Hale Postdoctoral Fellowship in Solar, Stellar and Space Physics at the University of Colorado
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