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R. Rosner (The University of Chicago), Y.N. Young (Northwestern University), A. Alexakis, L.J. Dursi, J. Truran, A.C. Calder, B. Fryxell, K. Olson, P.M. Ricker, F.X. Timmes, M. Zingale, H.M. Tufo (The University of Chicago), P. MacNeice (NASA/Goddard Space Flight Center)
We report on studies of shear-driven mixing at the interface between a hydrogen-helium envelope and the carbon-oxygen surface of a pre-nova outburst white dwarf. Linear theory shows distinct regimes of unstable gravity surface waves and Kelvin-Helmholtz modes, which we follow into the weakly nonlinear regime by analytical techniques; we then follow the fully nonlinear evolution to the point of wave breaking, using the Chicago Flash Code. We also report on estimates of the mixing efficiency resulting from the combination of weakly driven convection and wave breaking; and discuss their implications for nova outbursts.
This work was supported by the DOE ASCI/Alliances program at the University of Chicago, under grant No. B341495.
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