Boundary conditions > Structural constraints > Nastran, Simcenter 3D Multiphysics, Abaqus, ANSYS, and LS-DYNA structural constraints > Velocity constraint (Nastran)
Define a velocity constraint using magnitude and a single direction
The Magnitude and direction type lets you define a velocity constraint with a magnitude and a single direction.
Choose Home tab→Loads and Conditions group→Velocity .
In the Velocity dialog box, select Magnitude and direction from the Type list.
In the Model Objects group, click Select Object and select the geometry or FE entity to which the velocity constraint will be applied.
In the Direction group, select a vector that specifies the direction of the velocity constraint. For more information, see Vector dialog box.
In the Magnitude group, define the velocity constraint magnitude in one of these ways:Select Expression to use a constant value or expression to define the magnitude. For more information, see Expressions. Select Field to define enforced displacement constraint magnitude that varies with frequency or time. For more information, see Using fields and expressions to define boundary conditions.
Click OK.The constraint is applied to the model.
How do I
Define a velocity constraint normal to the model
Define a velocity constraint using components
Define a spatial velocity constraint using translational components
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Velocity constraint (Nastran)
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Define a velocity constraint using magnitude and a single direction, Simcenter 3D 2021.1 Series
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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id623696 · retrieved 2026-07-17