Prescribed Velocity

The node adds a boundary or domain condition where the velocity is prescribed in one or more directions. This condition is applicable for time- dependent and frequency domain studies. It is possible to prescribe a velocity in one direction, leaving the structure free in the other directions. The node is a constraint and overrides any other constraint on the same selection.

To prescribe velocities on the top or bottom surfaces of the shell, use Prescribed Velocity, Interface.

Shell Properties

The selection in this section only acts as a filter for the boundary selection. The condition is applied all through the thickness of the shell.

Table 6-30: Layer Selections; Prescribed Velocity
Selection	Use All Layers	Selection of Individual Layers
Boundary, Edge	Same as interface selection when the node is added.	No

If the same layer is selected in two nodes being active on the same boundary, the second definition will override the previous.

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All other settings for the node are described in the documentation for Prescribed Velocity in the Solid Mechanics interface.

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For a general description of layer and interface selections, see The Shell Properties and Interface Selection Sections.

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You can prescribe velocities with a through-thickness variation by explicitly or implicitly using expressions containing the extra dimension coordinate as described in Using the Extra Dimension Coordinates.

Location in User Interface

Context Menus

Ribbon

Physics tab with selected: