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A multispecies turbulence model for the mixing and de-mixing of miscible fluids

Journal Article · · Journal of Turbulence (Online)
 [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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A de-mix capable model for turbulence in compressible, variable density flows is proposed. The model is based on the Besnard-Harlow-Rauenzahn (BHR) family of models (Besnard D, Harlow F, Rauenzahn R, et al. Turbulence transport equations for variable-density turbulence and their relationship to two-field models. NM (United States): Los Alamos National Laboratory; 1992 (Technical Report LA-12303-MS), but is extended to track the evolution of the turbulent fluxes and fluctuations in the material mass fractions for each species present. The new evolution equations are introduced without requiring additional closures or new empirically tuned coefficients relative to previous BHR models, and are shown to improve the model’s ability to reproduce the behaviour of simulations containing mixing layers that are constrained by a stabilising force. As a result, the model is tested in a range of canonical flows including Rayleigh-Taylor driven, shock driven, and shear driven turbulence, and is shown to produce reasonable agreement with simulations and experiments in these scenarios.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1829656
Report Number(s):
LA-UR--21-25311
Journal Information:
Journal of Turbulence (Online), Journal Name: Journal of Turbulence (Online) Journal Issue: 12 Vol. 22; ISSN 1468-5248
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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