The effect of hyperdiffusivity on turbulent dynamos with helicity

Details The effect of hyperdiffusivity on turbulent dynamos with helicity The effect of hyperdiffusivity on turbulent dynamos with helicity

2001-10-08

arxiv.org/abs/astro-ph/0110171v1

Phys.Rev.Lett. 88 (2002) 055003

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.88.055003

In numerical studies of turbulence, hyperviscosity is often used as a tool to extend the inertial subrange and to reduce the dissipative subrange. By analogy, hyperdiffusivity (or hyperresistivity) is sometimes used in magnetohydrodynamics. The underlying assumption is that only the small scales are affected by this manipulation. In the present paper, possible side effects on the evolution of the large scale magnetic field are investigated. It is found that for turbulent flows with helicity, hyperdiffusivity causes the dynamo-generated magnetic field to saturate at a higher level than normal diffusivity. This result is successfully interpreted in terms of magnetic helicity conservation, which also predicts that full saturation is only reached after a time comparable to the large scale magnetic (hyper)diffusion time.

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