Resolving boundary condition conflicts

Conflicts may occur when multiple boundary conditions are applied to the same nodal degree of freedom (DOF) or when multiple displacement coordinate systems are defined for the same node. Each time you create a boundary condition, the software automatically identifies conflicts. An icon appears in the Simulation Navigator next to the solution that contains conflicting boundary conditions to indicate the conflict, as shown in the example below.

Solution 1
Simulation Objects
Constraints
User Defined (1)
Enforced (1)

To resolve the conflict, right-click the solution and choose the Resolve Conflicts command. You can then use the options in the Conflict Resolution Manager dialog box to resolve the conflict. The available options depend on the nature of the conflict.

Note:

If your constraints are organized in constraint sets, the Conflict Resolution Manager dialog box will not list the constraint sets, and will instead list the individual constraints, including constraints that belong to a constraint set.

In the Simcenter Samcef environment, the software identifies boundary condition conflicts between constraints in the solution and constraints in subcases, as well as within the solution or within the same subcase. In other solver environments, the software only identifies conflicts within the solution or within the same subcase.

Specifying how to resolve a conflict

The Conflicting BCs list in the Conflict Resolution Manager dialog box lists all boundary conditions in the solution or step that have conflicts at a particular DOF. For each conflict, you use right-click options to specify how you want to resolve the issue. The software lists only the options that are appropriate for the selected conflict.

The available resolution options are:

• Apply boundary condition(1): Applies the values of boundary condition (1) to the DOF. The software also updates the Excluded list for boundary condition (2) to exclude the DOF from the boundary condition.

• Apply boundary condition(2): Applies the values of boundary condition (2) to the DOF. The software also updates the Excluded list for boundary condition (1) to exclude the DOF from the boundary condition.

• Average Values: Lets you create a new boundary condition at the conflicting DOF with a value that is the average of the DOF values of the conflicting boundary conditions. The software also updates the Excluded lists for each of the conflicting boundary conditions to exclude the DOF from the boundary condition.

• Add Values: Lets you create a new boundary condition at the conflicting DOF with a value that is the sum of the DOF values of the conflicting boundary conditions. The software also updates the Excluded lists for each of the conflicting boundary conditions to exclude the DOF from the boundary condition.

• Specify Values: Lets you specify new values at the DOF. With this option, the software creates a new boundary condition with the values you specify. The software also updates the Excluded lists for each of the conflicting boundary conditions to exclude the DOF from the boundary condition.

• Keep Overlapping: Retains the intersecting boundary conditions. This option is helpful for cases when the degrees of freedom affected by two intersecting boundary conditions are not actually in conflict. For example, in the Nastran environment, you can have both a Fixed Displacement Constraint and an Enforced Displacement Constraint defined on the same DOF.

Note:

When conflicting displacement coordinate systems are defined for the same node, the available conflict resolution options are limited to Ignore Conflict and Apply Override.

After you resolve a conflict, the software removes it from the Conflicting BCs list in the Conflict Resolution Manager dialog box and updates the associated boundary conditions.

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Resolving boundary condition conflicts, Simcenter 3D 2021.1 Series

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