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Dislocation dynamics in Rayleigh-Bénard convection
Th Walter1, W Pesch, E Bodenschatz
1Physikalisches Institut der Universität Bayreuth, D-95440 Bayreuth, Germany.
Abstract:
Theoretical results on the dynamics of dislocations in Rayleigh-Bénard convection are reported both for a Swift-Hohenberg model and the Oberbeck-Boussinesq equations. For intermediate Prandtl numbers the motion of dislocations is found to be driven by the superposition of two independent contributions: (i) the Peach-Koehler force and (ii) an advection force on the dislocation core by its self-generated mean flow. Their competition allows to explain the experimentally observed bound dislocation pairs.
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