Asymptotic behaviour of the Rayleigh--Taylor instability

Details Asymptotic behaviour of the Rayleigh--Taylor instability Asymptotic behaviour of the Rayleigh--Taylor instability

2004-12-19

arxiv.org/abs/physics/0412120v1

Physics

Fluid Dynamics

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.94.224501

We investigate long time numerical simulations of the inviscid Rayleigh-Taylor instability at Atwood number one using a boundary integral method. We are able to attain the asymptotic behavior for the spikes predicted by Clavin & Williams\cite{clavin} for which we give a simplified demonstration. In particular we observe that the spike's curvature evolves like $t^3$ while the overshoot in acceleration shows a good agreement with the suggested $1/t^5$ law. Moreover, we obtain consistent results for the prefactor coefficients of the asymptotic laws. Eventually we exhibit the self-similar behavior of the interface profile near the spike.

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