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Communication Dans Un Congrès Année : 2024

On the return to isotropy from anisotropic homogeneous turbulent shear flow

Frank G Jacobitz
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Kai Schneider

Résumé

This contribution presents direct numerical simulation results on the anisotropy properties of homogeneous turbulent shear flow as well as the return to isotropy from anisotropic states due to shear and initially imposed polarization anisotropy. The anisotropy properties are quantified using the Reynolds stress anisotropy tensor and a wavelet-based scale-dependent decomposition of the velocity fields is used to compute the Reynolds stress anisotropy tensor at different scales of the turbulent motion. For homogeneous turbulent shear flow, the largest contribution to anisotropy originates at the larger scales of the turbulent motion. The smaller scales, however, are observed to show small levels of anisotropy. The return towards isotropy from anisotropic states due to shear and polarization anisotropy is strongest at the smallest scales of the turbulent motion, while anisotropy persists for multiple eddy-turnover time scales at the larger scales of the turbulent motion.
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Dates et versions

hal-04597151 , version 1 (01-06-2024)

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  • HAL Id : hal-04597151 , version 1

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Frank G Jacobitz, Kai Schneider. On the return to isotropy from anisotropic homogeneous turbulent shear flow. 13th International Symposium on Turbulence and Shear Flow Phenomena (TSFP13) Montreal, Canada, June 25–28, 2024, Jun 2024, Montréal, Canada. ⟨hal-04597151⟩
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