2023
DOI: 10.1017/jfm.2023.833
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Geometry of stratified turbulent mixing: local alignment of the density gradient with rotation, shear and viscous dissipation

Xianyang Jiang,
Amir Atoufi,
Lu Zhu
et al.

Abstract: We introduce a geometric analysis of turbulent mixing in density-stratified flows based on the alignment of the density gradient in two orthogonal bases that are locally constructed from the velocity gradient tensor. The first basis connects diapycnal mixing to rotation and shearing motions, building on the recent ‘rortex–shear decomposition’ in stratified shear layers (Jiang et al., J. Fluid Mech., vol. 947, 2022, A30), while the second basis connects mixing to the principal axes of the viscous dissipation te… Show more

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