The Magnetic Shielding node adds a boundary condition for magnetic shielding. It describes a thin layer of a highly permeable medium that shields the magnetic field. The boundary condition uses the following equations for the normal magnetic flux density discontinuity and the tangential magnetic field inside the layer:
In these equations, ∇t represents a tangential derivative (gradient), and
ds is the surface thickness.
Select Relative permeability μr (dimensionless) to use the constitutive relation
B = μ0μrH. The default uses values
From material. For
User defined enter another value or expression.
Select B-H curve |B| (SI unit: T) to use a curve that relates magnetic field
H and the magnetic flux density
B as
|B| = f(|H|). The
Magnetic flux density norm setting can take the values
From material or
User defined.