Evolution of nonlinear interfacial structure induced by combined effect of Rayleigh-Taylor and Kelvin-Helmholtz instability |
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Authors: | Labakanta Mandal Sourav RoyRahul Banerjee Manoranjan KhanMR Gupta |
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Affiliation: | Department of Instrumentation Science & Centre for Plasma Studies, Jadavpur University, Kolkata 700032, India |
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Abstract: | The nonlinear evolution of two fluid interfacial structures such as bubbles and spikes arising due to the combined action of Rayleigh-Taylor and Kelvin-Helmholtz instability is investigated. Using Layzer's model analytic expressions for the asymptotic value of the combined growth rate are obtained in both cases for spikes and bubbles. However, if the overlying fluid is of lower density the interface perturbation behaves in different ways. Depending on the magnitude of the velocity shear associated with Kelvin-Helmholtz instability both the bubble and spike amplitude may simultaneously grow monotonically (instability) or oscillate with time. |
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Keywords: | Rayleigh-Taylor Kelvin-Helmholtz instability Bubble-spike |
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