A Tearing and Interconnecting Formulation for Magneto-Quasi-Statics
For researchers in computational electromagnetics, this provides a method to handle kernel functions in domain decomposition for eddy current problems, though it is incremental as it builds on existing tree-cotree splitting and space splitting techniques.
This work presents a tearing and interconnecting formulation for the eddy current model that eliminates kernel components associated with the interface by using a space splitting into gradient fields and a complementary space. The formulation ensures invertible subdomain operators and a globally H(div) magnetic field despite a discontinuous vector potential.
This note deals with a tearing and interconnecting (special non-overlapping domain decomposition) formulation for magneto-quasi-statics (also known as the eddy current model). Only two subdomains are considered, one conducting and one insulating. Using a straightforward tree-cotree splitting, one can get rid of some kernel components in the non-conducting region, but due to the coupling across the interface, a lot of kernel functions remain that are associated with the interface. The formulation presented here overcomes this problem by using a space splitting into gradient fields and a complementary space. Under a mild condition on that splitting, it is shown that (i) one does not need any gradient part in the non-conducting domain, and therefore no coupling of any gradient components between the two subdomains, (ii) both subdomain operators are invertible, and (iii) although the magnetic vector potential is discontinuous across the subdomain interface, the corresponding magnetic field is globally in H(div).