Specifying Boundary Conditions and Electric Current Density Sources

At each boundary, you can either specify the magnetic vector potential $A$ or the electric current sheet $J_{S}$ . You can also define electric current density sources on regions.

Specify appropriate boundary conditions at each boundary:

Expand the relevant Regions > [Region] > Boundaries > [Boundary] > Physics Conditions node.
Select the Magnetic Vector Potential Specification node and set Method as required.
For each of the magnetic vector potential models, Simcenter STAR-CCM+ provides several methods to specify $A$ and $J_{S}$ at a boundary. For information on the methods available to each model, see:
When using the harmonic balance models, $A$ and $J_{S}$ are specified as complex profiles.
For any region, you can define an electric current density using the Electric Current Density Source Option:
1. Select the relevant [Region] > Physics Conditions > Electric Current Density Source Option node and set Electric Current Density Source Option to Specified.
  This region input is not available when the associated continuum uses the Electrodynamic Potential model or the Excitation Coil model, as these models automatically calculate the electric current density in the region.
2. Set the corresponding [Region] > Physics Values > Electric Current Density User Source node:
  - In 2D or 3D simulations using either the Finite Element Magnetic Vector Potential model or the Finite Volume Magnetic Vector Potential model, specify the electric current density as a vector profile. In 2D simulations (TE mode), you only specify the components tangential to the 2D domain. For more information, see FE Magnetic Vector Potential Region Inputs and FV Magnetic Vector Potential Region Inputs.
  - In 2D simulations using the Transverse Magnetic Potential model (TM mode), specify the electric current density as a scalar profile, which represents the component of the electric current density perpendicular to the 2D region. When the current source is a nonlinear function of magnetic vector potential, specify also the Electric Current Density Source Potential Derivative, to improve the convergence of the Transverse Magnetic Potential solver. For more information, see TM Region Inputs.
  - When using the harmonic balance models, specify the electric current density as a complex profile. See Region Settings and Harmonic Balance FV Transverse Magnetic Potential Model Reference.
The Finite Element Magnetic Vector Potential model and the Transverse Magnetic Potential model also allow for interface inputs. For more information, see:
- FE Magnetic Vector Potential Interface Inputs
- Transverse Magnetic Potential Interface Inputs