Improved analytic modeling of the linear Rayleigh-Taylor instability with plasma transport

Abstract

The Rayleigh-Taylor (R-T) instability with transport effects has long been studied analytically in the neutral fluid regime. How this picture may differ in plasmas has been given less consideration, however. Leveraging previous numerical simulations with plasma viscosity and diffusion of R-T at a binary plasma interface, we show how plasma transport and kinetic effects alter the linear R-T dispersion relation. Our insight informs a much improved analytical dispersion relation, which better matches the simulation data than previously established models. Additionally, we demonstrate the importance of employing asymptotically correct viscosity coefficients in fluid codes for accurately capturing plasma R-T growth.