Numerical simulations of precession driven flows and their ability to drive a dynamo.
Numerical simulations of precession driven flows and their ability to drive a dynamo.
Giesecke, A.; Stefani, F.
Abstract
In a next generation dynamo experiment currently under development at Helmholtz-Zentrum Dresden-Rossendorf (HZDR) a fluid flow of liquid sodium, solely driven by precession, will be considered as a possible source for magnetic field generation.
In my talk I will present results from hydrodynamic simulations of a precession driven flow in cylindrical geometry. In a second step, the velocity fields obtained from the hydrodynamic simulations have been applied to a kinematic solver for the magnetic induction equation in order to determine whether a precession driven flow will be capable to drive a dynamo at experimental conditions.
It turns out that excitation of dynamo action in a precessing cylinder at moderate precession rates is difficult and future dynamo simulations are required in more extreme parameter regimes where a more complex fluid flow is observed in water experiments which is supposed to be beneficial for dynamo action.
Keywords: dynamo; precession; DRESDYN
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Eingeladener Vortrag (Konferenzbeitrag)
PASC16 - Platform for Scientifik Computing, 08.-10.06.2016, Lausanne, Switzerland
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Permalink: https://www.hzdr.de/publications/Publ-23410