The nonlinear evolution of large structure in Rayleigh-Taylor and Richtmyer-Meshkov bubble and spike fronts is studied numerically and explained theoretically on the basis of single-mode and two-bubble interaction physics at Atwood numbers (A). Multimode Rayleigh-Taylor bubble (spike) fronts are found as hB=αBAgt² [hₛ=αₛ(A)gt²] with αB=0.05, while Richtmyer-Meshkov bubble (spike) fronts are found as hB=aBt^θB (hₛ=aₛt^θₛ(A)) with θB=0.4 at all A's. The dependence of these scaling laws and parameters on A and on initial conditions is explained.
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Alon et al. (1995) studied this question.
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