Revisiting the Effects of Compressibility on the Rayleigh-Taylor Instability

• 作 者: 周前红 李定
• 机 构: CAS Key Laboratory of Basic Plasma Physics,School of Science,University of Science and Technology of
• 出 处: Plasma Science and Technology
• 发表日期: 2007年04期
• 关键词: Rayleigh instability exponentially gated eliminating increment sharp stabilizing

The effects of compressibility on the Rayleigh-Taylor instability(RTI)are investi-gated.It is shown that the controversy over compressibility effects in the previous studies is due toimproper comparison,in which the density varying effect obscures the real role of compressibility.After eliminating the density varying effect,it is found that the compressibility destabilizes RTIin both the cases of constant density and exponentially varying density when M《1.This desta-bilizing effect is more important at smaller values of the Atwood number AT or greater values ofgravity g,and the increment in the growth rate produced by compressibility depends inversely onthe pressure p or the ratio of specific heat■.

The effects of compressibility on the Rayleigh-Taylor instability (RTI) are investi- gated. It shows that the controversy over compressibility effects in the previous studies is due to tomproper comparison, in which the density varying effect obscures the real role of compressibility. After eliminating the density varying effect, it is found that the compressibility destabilizes RTIin both the cases of constant density and exponentially varying density when M "1. This desta-bilizing effect is more important at smaller values ​​of the Atwood number AT or greater values ​​of gravity g , and the increment in the growth rate produced by compressibility depends inversely on the pressure p or the ratio of specific heat ■.