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The Rayleigh-Taylor Instability (RTI) in compressible flow withinter-molecular interactions is probed via the Discrete Boltzmann Method (DBM).The effects of interfacial tension, viscosity and heat conduction areinvestigated. It is found that the influences of interfacial tension on theperturbation amplitude, bubble velocity, and two kinds of entropy productionrates all show differences at different stages of RTI evolution. It inhibitsthe RTI evolution at the bubble acceleration stage, while at the asymptoticvelocity stage, it first promotes and then inhibits the RTI evolution.Viscosity and heat conduction inhibit the RTI evolution. Viscosity shows asuppressive effect on entropy generation rate related to heat flow at the earlystage but a first promotive and then suppressive effect on entropy generationrate related to heat flow at a later stage. Heat conduction shows a promotiveeffect on entropy generation rate related to heat flow at an early stage.Still, it offers a first promotive and then suppressive effect on entropygeneration rate related to heat flow at a later stage. By introducing themorphological boundary length, we found that the stage of exponential growth ofinterface length with time corresponds to the bubble acceleration stage. Thefirst maximum point of interface length change rate and the first maximum pointof the change rate of entropy generation rate related to viscous stress can beused as a new criterion for RTI to enter the asymptotic velocity stage.

Discrete Boltzmann modeling of Rayleigh-Taylor instability: effects of interfacial tension, viscosity and heat conductivity