17.6.2.25. Voltage

A Voltage load simulates the application of an electric potential to a body.

This page includes the following sections:

Analysis Types

Voltage is available for the following analysis types:

For each analysis type, you define the Voltage by magnitude and phase angle in the Details pane, according to the following equation. (LS-DYNA systems only set a constant value, without phase or frequency.)

V = Vocos(ωt+φ)

Vo is the magnitude of the Voltage (input value Voltage), ω is the frequency, and φ is the phase angle. For a static analysis, ωt = 0.

Magnetostatic Analysis Requirements

See Voltage Excitation for Solid Source Conductors.

Dimensional Types

The supported dimensional types for the Voltage boundary condition include:

  • 3D Simulation

  • 2D Simulation

Geometry Types

The supported geometry types for the Voltage boundary condition include:

  • Solid

Topology Selection Options

The supported topology selection options for Voltage include:

Magnitude Options

The supported Magnitude options for Voltage include the following:

  • Constant

  • Tabular (Time Varying)

  • Function (Time Varying)

Caution:  During an Coupled Field Harmonic, Coupled Field Modal, or Electric/Thermal-Electric Analysis, Voltage loads cannot be applied to a face, edge, or vertex that is shared with another voltage or current load or a Coupling.

Applying a Voltage Boundary Condition

To apply a Voltage:

  1. Select the Voltage option from the Environment Context tab. Alternatively, right-click the Environment tree object or in the Geometry window and select Insert>Voltage.

  2. Define the Scoping Method as either Geometry Selection, Named Selection, or Voltage Coupling and then specify the geometry.

  3. Enter a Magnitude value.

  4. Enter a Phase Angle value. (Phase will not be needed for LS-DYNA systems.)

Details Pane Properties

The selections available in the Details pane are described below.

CategoryProperty/Options/Description

Scope

Scoping Method: Options include:

  • Geometry Selection (default): Default setting, indicating that the boundary condition is applied to a geometry or geometries, which are chosen using a graphical selection tool.

    • Geometry: Visible when the Scoping Method is set to Geometry Selection. Displays the type of geometry (Body, Face, etc.) and the number of geometric entities (for example: 1 Body, 2 Edges) to which the boundary has been applied using the selection tools.

  • Named Selection: Indicates that the geometry selection is defined by a Named Selection.

    • Named Selection: Visible when the Scoping Method is set to Named Selection. This field provides a drop-down list of available user–defined Named Selections.

  • Voltage Coupling: This option is only available for Coupled Field Harmonic and Coupled Field Modal analyses. It indicates that the geometry selection is defined by a Voltage Coupling.

    • Voltage Coupling: Visible when the Scoping Method is set to Voltage Coupling. This field provides a drop-down list of available user-defined Voltage Coupling objects.

Definition

Type: Read-only field that displays boundary condition type - Voltage.

Magnitude

Phase Angle

Suppressed: Include (No - default) or exclude (Yes) the boundary condition.

Mechanical APDL References and Notes

The following Mechanical APDL commands, element types, and considerations are applicable for this boundary condition.

  • Voltages are applied using the D command.

  • Magnitude (constant, tabular, and function) is always represented as a table in the input file.

LS-DYNA References and Notes

*EM_BOUNDARY_PRESCRIBED is used to implement the Voltage boundary condition.