Associating boundary conditions with solution steps

Before you can solve your model, the appropriate boundary conditions (loads, constraints, and simulation objects) must be associated with the appropriate container in each solution step (called a subcase in Nastran models).

For models with a small number of boundary conditions and few solutions, boundary condition associations are largely automatic, although you may need to explicitly add or remove boundary conditions to fully define a solution. With models of larger size and complexity, however, it becomes increasingly important to track, manage, and document how boundary condition associations are made.

Automatically adding boundary conditions to the active solution or step

Once you have at least one solution with one or more steps, any boundary conditions you create are automatically added to the appropriate container in the active solution or solution step. The active solution and solution step are indicated in the Status column in the Simulation Navigator.

• By default, the last solution you create is the active solution

• By default, the last step you create in the active solution is the active step.

To change the active solution, right-click the solution node in the Simulation Navigator and choose Make Active. To change the active solution step, first make the parent solution active if necessary, and then right-click the solution step and choose Make Active.

Explicitly adding and removing boundary conditions to the active solution or solution step

If you add a new solution, or add a new step to an existing solution, then any existing boundary conditions are not automatically added to the new solution or step. You can easily add an existing boundary condition or boundary condition folder to the active solution by dragging and dropping, or by using the shortcut menu in the Simulation Navigator.

How do I

Explicitly add a boundary condition to a solution, step, or subcase

Manage solution associations

Manage boundary conditions in multiple steps or subcases

Scale loads using the Step/Subcase Manager

Edit boundary condition-step associations in a spreadsheet

Learn more

Managing solution associations

Managing boundary conditions in steps or subcases

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Associating boundary conditions with solution steps, Simcenter 3D 2021.1 Series

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