Boundary conditions > Structural constraints > Nastran, Simcenter 3D Multiphysics, Abaqus, ANSYS, and LS-DYNA structural constraints > Transient initial conditions (Nastran)
Define transient initial conditions using magnitude and direction
The Magnitude and Direction type lets you define a transient initial condition constraint with a magnitude and a single direction.
Choose Home tab→Loads and Conditions group→Transient Initial Conditions .
In the Transient Initial Conditions dialog box, select Magnitude and Direction from the Type list.
In the Model Objects group, click Select Object and select the geometry, node, element, or other FEM object to which the initial conditions will be applied.
In the Direction group, select a vector that specifies the direction of the initial conditions. The software creates a displacement coordinate system if the vector does not match the work coordinate system Z direction.For more information, see Vector dialog box.
In the Magnitudes group, define the Initial Displacement and/or Initial Velocity as constant values or expressions. For more information, see Expressions.
(Optional) In the Distribution group, select the method for distributing the initial conditions.Select Constant to apply the magnitude as a constant value.Select Spatial to use a unitless field to map the magnitude to the nodes.For more information, see Using fields and expressions to define boundary conditions.
Click OK.The constraint is applied to the model.
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Define transient initial conditions using magnitude and direction, Simcenter 3D 2021.1 Series
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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id623651 · retrieved 2026-07-17