Enabling or disabling constraints in subcases (Simcenter Samcef)

In a Simcenter Samcef Nonlinear Analysis, you can add some boundary conditions either to the active solution, or to one or several subcases. You can do this only for the following constraints:

• Fixed Constraint

• Fixed Translation Constraint

• Fixed Rotation Constraint

• User Defined Constraint

• Simply Supported Constraint

• Symmetric Constraint

• Slider Constraint

• Pinned Constraint

• Cylindrical Constraint

• Roller Constraint

Constraints are stored in containers at the solution level and at the subcase level. If no Constraints container exists in the target subcase to which you want to drag a constraint, create one by right-clicking the subcase and choosing New Boundary Condition Container → Constraints:

Adding a constraint to the solution

You can add a constraint to the active solution in several ways:

• Create a constraint when a solution with no subcases is active. The constraint you create is added to the Constraints container of the active solution and to the Constraint Container at the Simulation file level.

• Drag a constraint from a subcase to the Constraint Container at the Simulation file level.

• Drag a constraint from a subcase to the Constraints container of the active solution.Note: Simcenter Samcef solver fails if the same constraint is defined at both the subcase and the solution level. Therefore, after your move the constraint to the solution level, you must remove that constraint from all the subcase Constraints containers in which the constraint appears.

This constraint is then applied to all the subcases.

Adding a constraint to a subcase

You can add a constraint to an active subcase in two ways:

• When a subcase is active, define a constraint. The constraint you define is automatically added to the Constraints container of that subcase (1).

• To add an existing constraint to another subcase, do one of the following:Drag the constraint from the Constraint Container of your model to the Constraints container of that subcase (2).If the constraint was defined in the active solution, drag that constraint from the Constraints container of the solution to the Constraints container of the target subcase.Note: Simcenter Samcef solver fails if the same constraint is defined at both the subcase and the solution level. Therefore, after you move a constraint to the solution level, you must remove that constraint from all the subcase Constraints containers in which the constraint appears.

Note:

The Simcenter Samcef solver does not apply a smooth transition if a constraint appears in one subcase, but not in the following one.

Input file

For each subcase k in which the constraint appears in, a .CLM FIX ... SUBC k command is issued in the Simcenter Samcef input file.

For more information, see the boundary conditions page in the Simcenter Samcef solver documentation.

Learn more

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Initial Temperature in a nonlinear and heat transfer solution (Simcenter Samcef)

Support of 4D table fields (Simcenter Samcef)

Enabling or disabling entities (Simcenter Samcef)

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Simcenter Samcef boundary conditions

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Enabling or disabling constraints in subcases (Simcenter Samcef), Simcenter 3D 2021.1 Series

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