Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session A43: Turbulence: Modeling I
8:00 AM–9:57 AM,
Sunday, November 19, 2023
Room: 207B
Chair: Patrick Jenny, ETH Zurich
Abstract: A43.00009 : Testing a Novel Transition Model for Mixing Layers with DNS Data*
9:44 AM–9:57 AM
Presenter:
Christopher Pezanosky
(University of Chicago)
Authors:
Christopher Pezanosky
(University of Chicago)
Vincent Laroche
(University of California, Berkeley)
Daniel M israel
(Los Alamos National Laboratory)
Filipe Pereira
(Los Alamos National Laboratory)
Anthony P Haas
(Los Alamos National Laboratory)
considering shear (Kelvin-Helmholtz) and buoyant (Rayleigh-Taylor) instabilities. Notably, the
model includes equations for the full Reynolds-stress tensor, deviating from the common practice
of transition models, which simulate only the transport of turbulent kinetic energy. This allows
for the exact closure of shear-production terms in the Reynolds-stress transport equations. The
new model also includes an explicit closure for the pressure-diffusion term, which is normally
neglected, but is shown to be critical in transition. In order to test the model, we compare
solutions to the specific forms of the equations for pure Rayleigh-Taylor and Kelvin-Helmoltz
instabilities with data from direct numerical simulation (DNS) for the same cases, using initial
conditions derived from linear stability theory. The results of these comparisons will both speak
to the validity of the transition model and provide guidance for potential modifications.
*Research presented in this paper was supported by the Laboratory Directed Research and Development program and Advanced Simulation and Computing- Verification and Validation program of Los Alamos National Laboratory under project number 20210218ER.
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