Application of a grid based hybrid finite volume/boundary element method for simulations of the kinematic induction equation with insulating boundary conditions.
Application of a grid based hybrid finite volume/boundary element method for simulations of the kinematic induction equation with insulating boundary conditions.
Giesecke, A.; Stefani, F.; Gerbeth, G.
The experimental realization of dynamo excitation as well as theoretical and numerical examinations of the induction equation have shown the relevance of boundary conditions and material properties for a self-sustaining dynamo. Generally, in non-spherical geometry typical insulating boundary conditions are described by elaborated schemes (e.g. solving of the Laplace equation in an extended domain) or by simplifying approximations (pseudo vacuum). A different approach is provided by a modified integral equation procedure, commonly known as the boundary element method (BEM). Integrating the Laplace equation on the boundaries allows to overcome the difficulties of the non-local character of insulating boundary conditions and the direct computation of the magnetic field next to an insulator becomes possible. However, within the interior of a field producing domain geometric constraints or varying material properties (e.g. electrical conductivity of the container walls or localized high-permeability material) might also play a role.
Keywords: nunerical simulations; dynamo; insulator boundary conditions; boundary element method
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Lecture (others)
SFB Meeting, 12.11.2009, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-13374