Abstract : A spectral analysis of strictly axisymmetric turbulence is performed. Both freely decaying and statistically steady flows are considered. In helical flows we identify a dual cascade, where energy is transferred towards the large scales and helicity to the smallest ones. It is shown that even in the absence of net helicity, a dual cascade persists, transferring energy backward and positively and negatively polarized helicity fluctuations forward.
https://hal.archives-ouvertes.fr/hal-01705327
Contributor : Wouter Bos
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Submitted on : Friday, February 9, 2018 - 12:38:26 PM
Last modification on : Thursday, November 21, 2019 - 2:30:04 AM
Long-term archiving on: Saturday, May 5, 2018 - 11:56:37 AM
Bo Qu, Aurore Naso, Wouter J.T. Bos. Cascades of energy and helicity in axisymmetric turbulence. Physical Review Fluids, American Physical Society, 2018, 3 (1), pp.014607. ⟨10.1103/PhysRevFluids.3.014607⟩. ⟨hal-01705327⟩
