Comprehensive numerical methodology for direct numerical simulations of compressible Rayleigh-Taylor instability

Reckinger, Scott James¹  Livescu, Daniel²  Vasilyev, Oleg V.³ 

[1] Montana State Univ., Bozeman, MT (United States);Los Alamos National Lab. (LANL), Los Alamos, NM (United States);Univ. of Colorado, Boulder, CO (United States)

DOI  :  10.2172/1321662
RP-ID  :  LA-UR--16-26726
PID  :  OSTI ID: 1321662

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来源: SciTech Connect

【 摘 要 】

A comprehensive numerical methodology has been developed that handles the challenges introduced by considering the compressive nature of Rayleigh-Taylor instability (RTI) systems, which include sharp interfacial density gradients on strongly stratified background states, acoustic wave generation and removal at computational boundaries, and stratification-dependent vorticity production. The computational framework is used to simulate two-dimensional single-mode RTI to extreme late-times for a wide range of flow compressibility and variable density effects. The results show that flow compressibility acts to reduce the growth of RTI for low Atwood numbers, as predicted from linear stability analysis.