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Large-eddy simulation and Reynolds-averaged Navier-Stokes modeling of three Rayleigh-Taylor mixing configurations with gravity reversal

Journal Article · · Physical Review. E
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
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In this work, high-fidelity large-eddy simulation (LES) is performed of Rayleigh-Taylor (RT) mixing in three different configurations involving gravity reversal. In each configuration, LES results are compared with one-dimensional Reynolds-averaged Navier-Stokes (RANS) results, and a deficiency in a commonly used transport equation for the mass-flux velocity, $$a_j$$, is identified. In the first configuration, a classical two-component RT mixing layer is allowed to develop before it is subjected to rapid acceleration reversal. In the second configuration, a three-component RT mixing layer with an intermediate density layer is allowed to develop before being subjected to rapid acceleration reversal. Finally, in the third configuration, a light layer is interposed between two heavy layers; in this configuration, only one interface is RT-unstable at a time as it undergoes rapid acceleration reversal. In all cases, a commonly used buoyancy production closure in the $$a_j$$ transport equation is shown to lead to significant over-prediction of mixing layer growth after gravity reversal. An alternative formulation for this closure is then presented which is shown to more accurately capture the stabilization effect of gravity reversal.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1879272
Report Number(s):
LLNL-JRNL-835181; 1053217
Journal Information:
Physical Review. E, Journal Name: Physical Review. E Journal Issue: 2 Vol. 106; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (17)

TABLE I(p. 4)table TABLE I
FIG. 1(p. 5)figure FIG. 1
TABLE II(p. 8)table TABLE II
FIG. 2(p. 9)figure FIG. 2
TABLE III(p. 9)table TABLE III
FIG. 3(p. 10)figure FIG. 3
FIG. 4(p. 10)figure FIG. 4
FIG. 5(p. 11)figure FIG. 5
FIG. 6(p. 11)figure FIG. 6
FIG. 7(p. 12)figure FIG. 7
FIG. 8(p. 12)figure FIG. 8
FIG. 10(p. 13)figure FIG. 10
FIG. 9(p. 13)figure FIG. 9
FIG. 11(p. 14)figure FIG. 11
FIG. 12(p. 15)figure FIG. 12
FIG. 13(p. 15)figure FIG. 13
FIG. 14(p. 18)figure FIG. 14

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