[startingWithCFD]

Hello there!

I would like to impose a boundary condition based on the amount of mass which is inside my domain, as follows

        type            groovyBC;
        ...
        variables
        (
            ...
            "Mass{cellSet'allCells}=sum(rho*vol());"
            ...
        );
        valueExpression "bananas*Mass";

The problem is that when the problem is decomposed, Mass contains the value corresponding to the current processor domain. Is there a way to force a parallel reduce operation?

[gschaider]

Originally Posted by startingWithCFD

Hello there!

I would like to impose a boundary condition based on the amount of mass which is inside my domain, as follows

        type            groovyBC;
        ...
        variables
        (
            ...
            "Mass{cellSet'allCells}=sum(rho*vol());"
            ...
        );
        valueExpression "bananas*Mass";

The problem is that when the problem is decomposed, Mass contains the value corresponding to the current processor domain. Is there a way to force a parallel reduce operation?

The question is "is there a way to force swak to NOT do a parallel reduce?". To which I would have to say "No".

Seriously: functions like sum, max, min AUTOMATICALLY reduce over all processors (if you find instances where this isn't the case: report a bug). In my mind this is the only behaviour that makes sense for this application

[startingWithCFD]

Great, thanks for the answer :-)
I guess I reached a conclusion too fast!