Theory and applications of the vortex-surface field

Yang, Yue

doi:10.1360/tb-2019-0596

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2022

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Cited by 2 publications

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“…The vortex-surface field (VSF) is a Lagrangian-based method to identify and characterize coherent vortical structures [1,2]. The VSF isosurface is a vortex surface consisting of vortex lines.…”

Section: Introductionmentioning

confidence: 99%

Criteria of tracking vortex surfaces in turbulent-like flows

Han

Yang

2022

Adv. Aerodyn.

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We propose criteria of tracking vortex surfaces in complex flows based on the vortex-surface field (VSF). The criteria characterize the accuracy and Lagrangian tracking performance of the numerical VSF solution, and determine the time period when the vortex surface tracking is satisfactory. Moreover, we develop a turbulent-like flow combining large-scale coherent structures in the Taylor–Green flow and small-scale turbulent structures in homogeneous isotropic turbulence (HIT). From tracking of vortex surfaces during the effective tracking period, we find that the imposed HIT disturbance significantly wrinkles vortex surfaces. Subsequently, the wrinkled vortex tube with large vorticity magnitude tends to be further twisted, contributing to energy cascade, while the wrinkling is mitigated in the region with small vorticity magnitude.

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Section: Introductionmentioning

confidence: 99%