The Vetter-Sturtevant Shock Tube Problem in KULL

Ulitsky, M S

Lawrence Livermore National Laboratory

关键词: Shock Tubes;    71 Classical And Quantumm Mechanics, General Physics;    Physics;    Instability;   

DOI  :  10.2172/928150
RP-ID  :  UCRL-TR-216081
RP-ID  :  W-7405-ENG-48
RP-ID  :  928150

美国|英语

来源: UNT Digital Library

【 摘 要 】

The goal of the EZturb mix model in KULL is to predict the turbulent mixing process as it evolves from Rayleigh-Taylor, Richtmyer-Meshkov, or Kelvin-Helmholtz instabilities. In this report we focus on an example of the Richtmyer-Meshkov instability (which occurs when a shock hits an interface between fluids of different densities) with the additional complication of reshock. The experiment by Vetter & Sturtevant (VS) [1], involving a Mach 1.50 incident shock striking an air/SF{sub 6} interface, is a good one to model, now that we understand how the model performs for the Benjamin shock tube [2] and a prototypical incompressible Rayleigh-Taylor problem [3]. The x-t diagram for the VS shock tube is quite complicated, since the transmitted shock hits the far wall at {approx}2 millisec, reshocks the mixing zone slightly after 3 millisec (which sets up a release wave that hits the wall at {approx}4 millisec), and then the interface is hit with this expansion wave around 5 millisec. Needless to say, this problem is much more difficult to model than the Bejamin shock tube.