6. ELECTROMAGNETIC_BC Namelist

The ELECTROMAGNETIC_BC namelist is used to define boundary conditions for the electromagnetic (EM) models at external boundaries. Each instance of the namelist defines a particular condition to impose over a subset of the domain boundary. The boundary subset \(\Gamma\) is specified using mesh face sets. The namelist variable face_set_ids takes a list of face set IDs, and the boundary condition is applied at all faces belonging to those face sets. Note that the mesh in view here is the one specified by the EM_MESH namelist. Also note that ExodusII mesh side sets are imported into Truchas as face sets with the same IDs.

6.1. Namelist Variables

name

A unique name used to identify a particular instance of this namelist.

Type:

string

Default:

none

face_set_ids

A list of face set IDs that define the portion of the boundary \(\Gamma\) where the boundary condition will be imposed.

Type:

integer list (32 max)

Default:

none

type

The type of boundary condition. The available values are:

Value	Description
“pec”	Perfect electric conductor/no tangential E-field: \(\hat{n}\times\vec{E}=0\) on \(\Gamma\).
“ih-hfield”	A tangential H-field condition: \(\hat{n}\times\vec{H} = \hat{n}\times\vec{H}_\text{ext}\) on \(\Gamma\), where \(\vec{H}_\text{ext}\) is the external magnetic field defined by the INDUCTION_SOURCE_FIELD namelist.

Notes:

The default boundary condition is \(\hat{n}\times\vec{H}=0\).