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Title: Effective drift velocity from turbulent transport by vorticity

Journal Article · · Physical Review Fluids (Online)

We highlight the differing roles of vorticity and strain in the transport of coarse-grained scalars at length-scales larger than l by smaller scale (subscale) turbulence. We use the first term in a multiscale gradient expansion due to Eyink [1], which exhibits excellent correlation with the exact subscale physics when the partitioning length l is any scale smaller than that of the spectral peak. We show that unlike subscale strain, which acts as an anisotropic diffusion/anti-diffusion tensor, subscale vorticity’s contribution is solely a conservative advection of coarse-grained quantities by an eddy-induced non-divergent velocity, v*, that is proportional to the curl of vorticity. Therefore, material (Lagrangian) advection of coarse-grained quantities is accomplished not by the coarse grained flow velocity, u , but by the effective velocity, u + v*, the physics of which may improve commonly used LES models.

Research Organization:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
SC0020229; SC0019329; CBET-2143702; PHY-2020249; PHY-2206380; OCE-2123496; 80NSSC18K0772; NA0003856; SC0014318; NA0003914; AC02-05CH11231
OSTI ID:
1890485
Alternate ID(s):
OSTI ID: 1903295; OSTI ID: 1957732
Journal Information:
Physical Review Fluids (Online), Vol. 7, Issue 10; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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