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Effects of isothermal stratification strength on vorticity dynamics for single-mode compressible Rayleigh-Taylor instability

Journal Article · · Physical Review Fluids
 [1];  [1];  [2];  [3]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Univ. of Illinois, Chicago, IL (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
The effects of isothermal initial stratification on the dynamics of the vorticity for single-mode Rayleigh-Taylor instability (RTI) are examined using two-dimensional fully compressible wavelet-based direct numerical simulations. Here, the simulations model low Atwood number (A = 0.04) RTI development for four different initial stratification strengths, corresponding to Mach numbers from 0.3 (weakly stratified) to 1.2 (strongly stratified), and for three different Reynolds numbers, from 25 500 to 102 000. Here, the Mach number is based on the Atwood-independent gravity wave speed and characterizes the strength of the initial stratification. All simulations use adaptive wavelet-based mesh refinement to achieve very fine spatial resolutions at relatively low computational cost. For all stratifications, the RTI bubble and spike go through the exponential growth regime, followed by a slowing of the RTI evolution.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1573339
Report Number(s):
LA-UR--18-31598
Journal Information:
Physical Review Fluids, Journal Name: Physical Review Fluids Journal Issue: 9 Vol. 4; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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