COMSOL 4.3a API Changes

General API Changes

•	Class files compiled with COMSOL Multiphysics version 4.3 or earlier need to be recompiled if they contain code that changes the contents of model.selection().

•	The solutionintitle property governs whether to show solution information in plot titles. But since solution information has never been shown for 1D plots, regardless of the content of the property, the property has been removed from 1D plot groups.

Fluid Flow Interfaces API

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Fluid flow features in the CFD Module and Microfluidics Module that previously created a scalar Lagrange multiplier field with default name model.un_lm now create a vectorial Lagrange multiplier field with default name model.u_lm. The default component names in 3D are model.u_lm, model.v_lm, and model.w_lm, respectively. Java® files must be updated accordingly.

•	Weak constraints for the Interior Wall feature are no longer available. Any references to its weak constraint parameter (weakConstraints) or Lagrange multipliers must be removed.

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The Automatic setting for the Pseudo time stepping property now sets the variable <phtag>.locCFL to the built-in variable CFLCMP, which in turn triggers a PID regulator via the automatic solver suggestions. Here, <phtag> is the physics interface tag. Java® files where pseudo time stepping is active and the local CFL number is set to Automatic must be modified by adding the command

model.physics(<tag>).prop("PseudoTimeProperty").set("CFLNumbExpr", 1, "Manual");

before calling a solver.