Spike deceleration and bubble acceleration in the ablative Rayleigh-Taylor instability
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DOI: 10.1063/1.3497006
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摘要: The nonlinear evolutions of the Rayleigh-Taylor instability (RTI) with preheat is investigated by numerical simulation (NS). A new phase spike deceleration evolution in ablative RTI (ARTI) discovered. It found that can be divided into weakly regime (WNR) and highly (HNR) according to difference acceleration velocities for bubble. With respect classical (i.e., without heat conduction), bubble first accelerates WNR then decelerates HNR while holds whole (NR). regard ARTI, on contrary, keeps NR. NS results indicate it overpressure effect at tip vorticity accumulation inside lead to, respectively, acceleration, ARTI. In addition, ARTI saturation velocity increases perturbation wavelength.
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