Sometimes, boundary conditions on two adjacent objects can come into conflict on a shared object (point or edge). For the boundary conditions in the thermoviscous physics that are based on constraints, you have the possibility to select that certain objects of lower dimensions should be excluded from the main selection. To do this, you must first click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box. In the settings, a new section named Excluded Edges and/or Excluded Points will then appear (when applicable). In these sections, you can select geometrical objects which should be excluded from the main selection when the constraint is applied.

When using the mechanical Velocity condition you may get conflicts if it is located next to a no-slip condition (a wall). To remedy this, you can exclude the common edge or point.

When using the Periodic Condition, you may get conflicts or duplicates which makes the model either overconstrained or problematic for the automatic constraint elimination algorithm. If you are aware of such situations, it is good practice to remove one of the potentially conflicting constraints. This could be in multiphysics models where you combine solid mechanics with thermoviscous acoustics and have edges where you both apply a Periodic Condition and the Thermoviscous Acoustic–Structure Boundary multiphysics coupling.