EFFECTS OF INITIAL CONDITIONS AND MACH NUMBER IN THE EVOLUTION OF RICHTMYER-MESHKOV INSTABILITIES etc15 Tracking Number 46Presentation: Session: Instability and Transition 1 Room: Room B Session start: 10:30 Tue 25 Aug 2015 Brandon Wilson bwilson@lanl.gov Affifliation: Los Alamos National Laboratory Ricardo Mejia-Alvarez rimejal@lanl.gov Affifliation: Los Alamos National Laboratory Kathy Prestridge kpp@lanl.gov Affifliation: Los Alamos National Laboratory Topics: - Transport and mixing, - Instability and transition Abstract: We present an experimental study of the effects of shock intensity and initial conditions on the evolution of Richtmyer-Meshkov Instabilities (RMI). This study is carried out in a vertical shock tube with a single interface of sulfur-hexafluoride and air. We use combined particle image velocimetry (PIV) and planar laser induced fluorescence (PLIF) to obtain simultaneous measurements of velocity and density. These measurements enable us to determine single- and multi-point statistics of vector, scalar, and combined fields. We use these statistical descriptors to study the evolution of turbulence mixing in RMIs under different Mach numbers and initial conditions. |