[olesen]

Originally Posted by crevoise

You are calling the class 'MixtureComponentManager'
How do you know the existence of this class? Is there somewhere a list of all the available classes available in CCM+?

The STARCCM installation contains the javadocs for its API. The descriptions are not exactly complete, but should provide you with enough information. The subdirectory: star/lib/doc/client/html/

a/ clearing sim_ : Is it important to all time do so before starting a java script?

This is not needed, but I think it is good style.

b/ declaring the string varaible Physic_name defined by the continuum.
If there are several continuum defined, how does this will work?

This only works for the case that you posed. If the continuum is named differently, or if there are more of them that you want to clear, you'll have a problem. If you want to loop over all possible physics continua, you'd need something like this:

ContinuumManager contMgr = sim_.getContinuumManager();
 
for (PhysicsContinuum cont: contMgr.getObjectsOf(PhysicsContinuum.class))
{
    ModelManager mdlMgr = cont.getModelManager()
 
    try
    {
        MixtureComponentManager gasMixMgr = mdlMgr
            .getModel(MultiComponentGasModel.class).getMixture().getComponents();
        gasMixMgr.deleteChildren(gasMixMgr.getComponents());
    }
    catch (Exception ex)
    {}
}

Note that we stuff the interesting bits inside of a try/catch grouping. This makes it failsafe for continua that are not actually gas mixtures.

@Override
public void execute() etc....

*******************
c/ What is the use of @Override ?

This somewhat pedantic. It works equally well without this annotation. However, the StarMacro already provides an empty 'execute' method that we are overriding and the @Override annotation documuments this.