Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC43: Turbulence: Buoyancy-Driven and Stratified II
12:50 PM–2:47 PM,
Tuesday, November 21, 2023
Room: 207B
Chair: Vishal Kumar, Argonne national laboratory; Miles Couchman, Department of Mathematics and Statistics, York University
Abstract: ZC43.00006 : Mixing efficiency in shearless, inhomogeneous, and stably stratified turbulence*
1:55 PM–2:08 PM
Presenter:
Ryan Hass
(Stanford University)
Authors:
Ryan Hass
(Stanford University)
Sanjiva K Lele
(Stanford University)
We propose a series of high-resolution large eddy simulations (1 – 8.5 billion mesh points) to investigate this problem with the goal of identifying limitations of popular models of the mixing efficiency and propose improvements that can handle this highly nonlinear regime. The code we will use is a high order incompressible Navier Stokes solver using a combination of pseudo-spectral and compact difference schemes. The flow is driven by a spatially localized body force which generates negligible mean flow. We have run a series of low-resolution cases (2 million mesh points) to validate the forcing method and determine the parameter space of interest which includes the energy dissipation rate, integral length scale, Reynolds number, Froude number, RMS velocities (stream- and span-wise), and turbulence kinetic energy as functions of distance from the forcing layer.
*Support for this research is provided by the NASA Pathways internship program, NASA cooperative agreement 80NSSC22M010, and computer time from the NSF ACESS program.
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