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Pointwise vanishing velocity helicity of a flow does not preclude magnetic field generation

Title
Pointwise vanishing velocity helicity of a flow does not preclude magnetic field generation
Type
Article in International Scientific Journal
Year
2019
Authors
Andrievsky, A
(Author)
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Chertovskih, R
(Author)
FEUP
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Zheligovsky, V
(Author)
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Journal
Title: Physical review. EImported from Authenticus Search for Journal Publications
Vol. 99
ISSN: 2470-0045
Other information
Authenticus ID: P-00Q-9JT
Abstract (EN): Pointwise zero velocity helicity density is shown not to prevent steady flows from acting as kinematic dynamos. We present numerical evidences that such flows can generate both small-scale magnetic fields as well as, by the magnetic alpha-effect or negative eddy diffusivity mechanisms, large-scale ones. The flows are constructed as curls of analytically defined space-periodic steady solenoidal flows, whose vorticity helicity (i.e., kinetic helicity) density is everywhere zero.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 9
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