The present work aims at expanding the set of buoyancy-driven unstable reference flows—a critical ingredient in the development of turbulence models—by considering the recently introduced “Unstably Stratified Homogeneous Turbulence” (USHT) in both its self-similar and transient regimes. The previously established accuracy of an anisotropic Eddy-Damped Quasi-Normal Markovian Model (EDQNM) on the USHT has allowed us to: (i) build a data set of well defined transient flows from Homogeneous Isotropic Turbulence (HIT) to late-time self-similar USHT and (ii) on this basis, calibrate, validate, and compare three common Reynolds-Averaged Navier–Stokes (RANS) mixing models (two-equation, Reynolds stress, and two-fluid). The model calibrations were performed on the self-similar flows constrained by predefined long range correlations (Saffman or Batchelor type). Then, with fixed constants, validations were carried out over the various transients defined by the initial Froude number and mixing intensity. Significant differences between the models are observed, but none of them can accurately capture all of the transient regimes at once. Closer inspection of the various model responses hints at possible routes for their improvement.
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July 2016
Research-Article
Challenging Mix Models on Transients to Self-Similarity of Unstably Stratified Homogeneous Turbulence Available to Purchase
Alan Burlot,
Alan Burlot
CEA, DAM, DIF,
Arpajon F-91297, France
Arpajon F-91297, France
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Jérôme Griffond,
Jérôme Griffond
CEA, DAM, DIF,
Arpajon F-91297, France
Arpajon F-91297, France
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Antoine Llor
Antoine Llor
CEA, DAM, DIF,
Arpajon F-91297, France
Arpajon F-91297, France
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Benoît-Joseph Gréa
Alan Burlot
CEA, DAM, DIF,
Arpajon F-91297, France
Arpajon F-91297, France
Jérôme Griffond
CEA, DAM, DIF,
Arpajon F-91297, France
Arpajon F-91297, France
Antoine Llor
CEA, DAM, DIF,
Arpajon F-91297, France
Arpajon F-91297, France
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 27, 2015; final manuscript received September 4, 2015; published online April 12, 2016. Assoc. Editor: Daniel Livescu.
J. Fluids Eng. Jul 2016, 138(7): 070904 (12 pages)
Published Online: April 12, 2016
Article history
Received:
March 27, 2015
Revised:
September 4, 2015
Citation
Gréa, B., Burlot, A., Griffond, J., and Llor, A. (April 12, 2016). "Challenging Mix Models on Transients to Self-Similarity of Unstably Stratified Homogeneous Turbulence." ASME. J. Fluids Eng. July 2016; 138(7): 070904. https://doi.org/10.1115/1.4032533
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