Discussion Forum

I'm solving for a dependent variable defined by a coefficient form PDE. But I need to confine the value of the dependent variable into a range, which can be defined by a piecewise function. So, is it possible to change the value of the dependent variable (defined using a function) at the end of each time step, so that the variable remains in the desired range? How do I implement this in comsol? For clarification, the variable maps to a circle and intrinsically has periodicity. What I intend to do is to add or subtract '2pi' if necessary at each time step through out the domain depending on the value of the dependent variable at current time step. Thanks in advance!