5.2. Limit Boundary

Limit Boundary is available for an Explicit Dynamics analysis only. It is not available for LS-DYNA.

The Limit Boundary can only be scoped to bodies with the Reference Frame option set to Particle. It is used to impose limits on the position of SPH nodes in the X, Y, and Z directions. The limits effectively specify a rigid wall upon which SPH nodes encroaching on the limit will bounce off. For instance, specifying a minimum limit of -10 m in the X-direction is like specifying a rigid wall in the Y-Z plane positioned at X = -10 m.

Common Characteristics

The following section outlines the common boundary condition characteristics that include application requirements of the boundary condition, support limitations, as well as loading definitions and values.

Dimensional Types

  • 3D Simulation: Supported.

  • 2D Simulation: Not Supported.

Geometry Types: The Limit Boundary may only be scoped to bodies with the Reference Frame option set to Particle.

Topology: The following topology selection options are supported for Limit Boundary.

  • Body: Supported.

  • Face: Not Supported.

  • Edge: Not Supported.

  • Vertex: Not Supported.

  • Nodes: Supported.

Details View Properties

The fields available in the Details view are described below.

Category Fields/Options/Description
Scope

Scoping Method: Options include:

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

    • 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 Nodes) 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.

Definition

Type: Read-only field set to Limit Boundary.

Limit Direction: Options include:

  • X: Use to set limits in the X direction only.

  • Y: Use to set limits in the Y direction only.

  • Z: Use to set limits in the Z direction only.

  • All: Use to set limits in the X, Y and Z directions.

  • Minimum Value: Only visible if Limit Direction is set to X, Y, or Z. Set the minimum permissible value in the direction specified for the SPH node locations.

  • Maximum Value: Only visible if Limit Direction is set to X, Y, or Z. Set the maximum permissible value in the direction specified for the SPH node locations.

  • Minimum X Value: Only visible if Limit Direction is set to All. Set the minimum permissible value in the X direction for the SPH node locations.

  • Maximum X Value: Only visible if Limit Direction is set to All. Set the maximum permissible value in the X direction for the SPH node locations.

  • Minimum Y Value: Only visible if Limit Direction is set to All. Set the minimum permissible value in the Y direction for the SPH node locations.

  • Maximum Y Value: Only visible if Limit Direction is set to All. Set the maximum permissible value in the Y direction for the SPH node locations.

  • Minimum Z Value: Only visible if Limit Direction is set to All. Set the minimum permissible value in the Z direction for the SPH node locations.

  • Maximum Z Value: Only visible if Limit Direction is set to All. Set the maximum permissible value in the Z direction for the SPH node locations.