Backward Compatibility with Version 4.3

New Terminology for Constraint Types

The following constraint types have new names in version 5.2a:

•	Bidirectional, symmetric is now Apply reaction terms on: All physics (symmetric).

•	Unidirectional is now Apply reaction terms on: Individual dependent variables.

Weak Constraints Update for the Laminar Flow Interface

The weak constraint formulations for the following boundary conditions have been updated:

•

Symmetry

•	The Slip option in the Wall feature

These boundary conditions are now formulated using the same set of Lagrange multipliers as all of the other boundary conditions in the Laminar Flow interface. The Lagrange multiplier un_lm has been removed.

Models saved in version 4.3 will include un_lm until the model is re-solved. In some cases, occurrences of un_lm in the solver sequence must be replaced manually. This is the case if un_lm was the only Lagrange multiplier component in a segregated group or the only Lagrange multiplier component of a Vanka smoother. Alternatively, you can generate a new automatic solver sequence. Models saved in versions earlier than 4.3 must either be re-solved in version 5.2a for postprocessing, or opened and re-saved in version 4.3 before being opened in version 5.2a.

Automatically Created Identity/Contact Pairs

The pairs created by the Form Assembly feature in the geometry can differ from their forms in 4.3 for certain 3D and 2D geometries. The pairs should now be the same for the CAD and COMSOL representations.