Nonlinear theory of the ablative Rayleigh-Taylor instability |
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Authors: | Sanz J Ramírez J Ramis R Betti R Town R P J |
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Institution: | E.T.S.I. Aeronáuticos, Universidad Politécnica de Madrid, Madrid 28040, Spain. |
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Abstract: | A fully nonlinear sharp-boundary model of the ablative Rayleigh-Taylor instability is derived and closed in a similar way to the self-consistent closure of the linear theory. It contains the stabilizing effect of ablation and accurately reproduces the results of 2D DRACO simulations. The single-mode saturation amplitude, bubble and spike evolutions in the nonlinear regimes, and the seeding of long-wavelength modes via mode coupling are determined and compared with the classical theory without ablation. Nonlinear stability above the linear cutoff is also predicted. |
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