The Solver Sequence Syntax
If you do not want to use the default solver sequence created by the study node, you can manually create one. To create a solver sequence, enter:
model.sol.create(<soltag>)
where <soltag> is a string used to refer to the solver sequence associated to a solution object.
A solver sequence has to be connected to a study node, which is done with the command:
sol.study(<studytag>)
where <studytag> is the tag of the study you want to associate the solver sequence sol.
A solver sequence also requires the definition of these nodes:
•
Study Step, where the study and study step is specified for compiling the equations and computing the current solver sequence;
•
Dependent Variables, this node handles settings for the computation of dependent variables, such as initial value and scaling settings but also the dependent variables not solved for; and
•
Solver node, where the type of solver to use is specified to compute the solution.
Add the nodes to the solver sequence with the command:
sol.feature.create(<ftag>, operation)
where sol is a link to a solver sequence node. The string <ftag> is a string that is defined to refer to the node, for example, a study step. operation can be 'StudyStep', 'Variables', or 'Stationary'.
To specify a property value pair for a solver feature, enter:
feat.set(property, <value>)
where feat is a link to the solver sequence feature node.
For a list of the operations available for the solver node, see Features Producing and Manipulating Solutions and Solvers and Study Steps, in the COMSOL Multiphysics Programming Reference Manual.