Kinetic helicity decay in linearly forced turbulence

Details Kinetic helicity decay in linearly forced turbulence Kinetic helicity decay in linearly forced turbulence

2010-12-07

arxiv.org/abs/1012.1464v2

Astron. Nachr. 333, 195-201 (2012)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 8 figures, Astron. Nachr. (accepted)

Scientific paper

10.1002/asna.201211654

The decay of kinetic helicity is studied in numerical models of forced turbulence using either an externally imposed forcing function as an inhomogeneous term in the equations or, alternatively, a term linear in the velocity giving rise to a linear instability. The externally imposed forcing function injects energy at the largest scales, giving rise to a turbulent inertial range with nearly constant energy flux while for linearly forced turbulence the spectral energy is maximum near the dissipation wavenumber. Kinetic helicity is injected once a statistically steady state is reached, but it is found to decay on a turbulent time scale regardless of the nature of the forcing and the value of the Reynolds number.

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