Direct simulation Monte Carlo investigation of the RayleighTaylor instability
In this paper, the RayleighTaylor instability (RTI) is investigated using the direct simulation Monte Carlo (DSMC) method of molecular gas dynamics. Here, fully resolved twodimensional DSMC RTI simulations are performed to quantify the growth of flat and singlemode perturbed interfaces between two atmosphericpressure monatomic gases as a function of the Atwood number and the gravitational acceleration. The DSMC simulations reproduce many qualitative features of the growth of the mixing layer and are in reasonable quantitative agreement with theoretical and empirical models in the linear, nonlinear, and selfsimilar regimes. In some of the simulations at late times, the instability enters the selfsimilar regime, in agreement with experimental observations. Finally, for the conditions simulated, diffusion can influence the initial instability growth significantly.
 Authors:

^{[1]};
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^{[2]}
 Sandia National Lab. (SNLNM), Albuquerque, NM (United States). Engineering Sciences Center
 Sandia National Lab. (SNLNM), Albuquerque, NM (United States). Computing Research Center
 Publication Date:
 Report Number(s):
 SAND20161868J
Journal ID: ISSN 2469990X; 619643; TRN: US1701676
 Grant/Contract Number:
 AC0494AL85000
 Type:
 Accepted Manuscript
 Journal Name:
 Physical Review Fluids
 Additional Journal Information:
 Journal Volume: 1; Journal Issue: 4; Journal ID: ISSN 2469990X
 Publisher:
 APS
 Research Org:
 Sandia National Lab. (SNLNM), Albuquerque, NM (United States)
 Sponsoring Org:
 USDOE National Nuclear Security Administration (NNSA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 42 ENGINEERING
 OSTI Identifier:
 1339256
 Alternate Identifier(s):
 OSTI ID: 1313260
Gallis, M. A., Koehler, T. P., Torczynski, J. R., and Plimpton, S. J.. Direct simulation Monte Carlo investigation of the RayleighTaylor instability. United States: N. p.,
Web. doi:10.1103/PhysRevFluids.1.043403.
Gallis, M. A., Koehler, T. P., Torczynski, J. R., & Plimpton, S. J.. Direct simulation Monte Carlo investigation of the RayleighTaylor instability. United States. doi:10.1103/PhysRevFluids.1.043403.
Gallis, M. A., Koehler, T. P., Torczynski, J. R., and Plimpton, S. J.. 2016.
"Direct simulation Monte Carlo investigation of the RayleighTaylor instability". United States.
doi:10.1103/PhysRevFluids.1.043403. https://www.osti.gov/servlets/purl/1339256.
@article{osti_1339256,
title = {Direct simulation Monte Carlo investigation of the RayleighTaylor instability},
author = {Gallis, M. A. and Koehler, T. P. and Torczynski, J. R. and Plimpton, S. J.},
abstractNote = {In this paper, the RayleighTaylor instability (RTI) is investigated using the direct simulation Monte Carlo (DSMC) method of molecular gas dynamics. Here, fully resolved twodimensional DSMC RTI simulations are performed to quantify the growth of flat and singlemode perturbed interfaces between two atmosphericpressure monatomic gases as a function of the Atwood number and the gravitational acceleration. The DSMC simulations reproduce many qualitative features of the growth of the mixing layer and are in reasonable quantitative agreement with theoretical and empirical models in the linear, nonlinear, and selfsimilar regimes. In some of the simulations at late times, the instability enters the selfsimilar regime, in agreement with experimental observations. Finally, for the conditions simulated, diffusion can influence the initial instability growth significantly.},
doi = {10.1103/PhysRevFluids.1.043403},
journal = {Physical Review Fluids},
number = 4,
volume = 1,
place = {United States},
year = {2016},
month = {8}
}