Tangential Magnetic Flux Condition¶
The tangential magnetic flux condition is a boundary condition which enforces the magnetic flux density \(\tilde{\mathbf{B}}\) to be tangential to the boundary by imposing
\[
\mathbf{n} \cdot \tilde{\mathbf{B}} = 0 \quad \text{on} \quad \Gamma.
\]
This condition is usually required for boundaries where current enters or leaves
the domain.
Specifically, when an Excitation Coil is defined as an open coil, the ports
must have a tangential magnetic flux boundary condition assigned.