Abstract
In this paper we study the enstrophy transfers in helical turbulence using direct numerical simulation. We observe that the helicity injection does not have significant effects on the inertial-range energy and helicity spectra (∼k-5/3) and fluxes (constants). We also calculate the separate contributions to enstrophy transfers via velocity-to-vorticity and vorticity-to-vorticity channels. There are four different enstrophy fluxes associated with the former channel or vorticity stretching, and one flux associated with the latter channel or vorticity advection. In the inertial range, the fluxes due to vorticity stretching are larger than that due to advection. These transfers too are insensitive to helicity injection.
| Original language | English (US) |
|---|---|
| Journal | Physical Review Fluids |
| Volume | 4 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 28 2019 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledged KAUST grant number(s): k1052
Acknowledgements: Our numerical simulations have been performed on Shaheen II at the Kaust supercomputing laboratory, Saudi Arabia, under the project k1052. This work was supported by the research grants PLANEX/PHY/2015239 from the Indian Space Research Organisation, India, and by the Department of Science and Technology, India (INT/RUS/RSF/P-03).