Journal
JOURNAL OF FLUID MECHANICS
Volume 895, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2020.307
Keywords
isotropic turbulence; homogeneous turbulence; turbulence simulation
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Funding
- IFCAM project [MA/IFCAM/19/90]
- CEFIPRA [6104-1]
- Grenoble Alpes University
- KAUST supercomputing laboratory, Saudi Arabia [k1416]
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Using direct numerical simulation of hydrodynamic turbulence with helicity forcing applied at all scales, a near-maximum helical turbulent state is obtained, with an inverse energy cascade at scales larger than the energy forcing scale and a forward helicity cascade at scales smaller than the energy forcing scale. In contrast to previous studies using decimated triads, our simulations contain all possible triads. By computing the shell-to-shell energy fluxes, we show that the inverse energy cascade results from weakly non-local interactions among homochiral triads. Varying the helicity injection range of scales leads to necessary conditions to obtain an inverse energy cascade.
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