Cascades of energy and helicity in axisymmetric turbulence

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.
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Submitted on : Friday, February 9, 2018 - 12:38:26 PM
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PhysRevFluids.3.014607-1.pdf
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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⟩

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