Pointwise vanishing velocity helicity of a flow does not preclude magnetic field generation.
basic_science · Level V
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- Record sourced from PubMed, PMID 30999421.
- Also identified by DOI 10.1103/PhysRevE.99.033204.
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Abstract
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 α-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.