Boundary Conditions
The Boundary Conditions and associated Electric Field parameters are specified as follows:
• > >
• In the Model tab, select Electric Field
Insulator
This is an electric field boundary condition, which does not allow free flow of charge, so the electric field lines cannot pass through it as they do in conductors.
Specified Voltage
This is used whenever the voltage at a boundary is explicitly defined and fixed.
Specified Charge Density
This is used to define a known surface charge density (
) on a boundary. This condition is essential for accurately modelling scenarios, where the surface charge distribution influences the electric field behavior.
) on a boundary. This condition is essential for accurately modelling scenarios, where the surface charge distribution influences the electric field behavior.Flow Direction— This defines the current direction normal to the boundary. The magnitude is controlled by the Normal Velocity Component. The Current direction can be Inflow, Outflow, or Both.
1. Inflow— Allows current flow into the domain, such that a positive Valve for the Charge Density will result in a boundary velocity pointing into the domain.
2. Outflow— Allows current flow out of the domain, such that a positive Valve for the Charge Density will result in a boundary velocity pointing out of the domain.
3. Both— Allows current flow in or out of the domain. A positive Valve for the Charge Density will result in outflow. A negative Valve for the Charge Density will result in inflow.
Symmetry
Symmetry for Electric Field corresponds to a mirror-image behavior across a given plane.
Specified Total Current
This is used whenever the total current at a boundary is explicitly defined and fixed.
Flow Direction
This defines the current flow normal to the boundary. The magnitude is controlled by the Normal Velocity Component. The Current direction can be Inflow, Outflow, or Both.