Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X02: Turbulence: Theory II
8:00 AM–10:36 AM,
Tuesday, November 21, 2023
Room: Ballroom B
Chair: Charles Meneveau, Johns Hopkins University
Abstract: X02.00003 : Role of pressure on formation of extreme velocity gradients in turbulence*
8:26 AM–8:39 AM
Presenter:
Alain J Pumir
(Ecole Normale Superieure de Lyon)
Authors:
Alain J Pumir
(Ecole Normale Superieure de Lyon)
Dhawal Buaria
(New York University (NYU))
Overall, H inhibits vortex stretching (VS), although the inhibition is much weaker than the amplification induced by other nonlinear mechanisms. However, in regions of most intense vorticity, the contribution from H dominates over nonlinearity, leading to an overall depletion of VS. We also observe near-perfect alignment between vorticity and the eigenvector of H corresponding to the smallest eigenvalue, consistent with the presence of intense vortex-tubes. We discuss the connection between the VS-inhibiting role of pressure, and the recently identified self-attenuation mechanism [Buaria et al. Nat. Commun. 11:5852 (2020)], whereby intense vorticity is locally attenuated through inviscid effects. We also discuss the influence of pressure Hessian on strain amplification, which is substantially weaker.
*This work was supported by the French ANR through TILT project. Computer resources from JUWELS and JUQUEEN at Jülich Supercomputing Center were provided by the Gauss Center for Supercomputing e.V.
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