[Andrea_85]

Hello,

i want to output the weighted average of temperature on a given plane as postProcessing using functionObject (i am using "execFlowFunctionObject -time myTime" to run it as postprocessing). I added these lines to my controlDict:

 surfacePlane
    {
        type swakExpression;
        valueType surface;
        surfaceName testPlane;
        surface {
            type plane;
            basePoint       (0.0040125 1.25e-4 0);
            normalVector    (1 0 0);
            interpolate false;
        }
        verbose true;
        expression "T*area()/sum(area())";
        accumulations (
              sum
        );
    }

However, it seems it does not recognize the field "T". I get this error

--> FOAM FATAL ERROR:
 Parser Error for driver SampledSurfaceValueExpressionDriver at "1.1-2" :"field T not existing or of wrong type"
"T*area()/sum(area())"
  ^^
--|

what am i doing wrong?
i am using openfoam 2.3

Thanks,

andrea

[kera]

Hi,

I am not sure what is actually triggering that error, apart from saying that you might be missing "T" field in your time directory :P, as your functionObject worked out fine for me.

I am wondering, is there any reason that you are using this expression

 expression "T*area()/sum(area())";
        accumulations (
              sum
        );

and not this

 expression "T";
        accumulations (
              weightedAverage
        );

Regards,
Ricky

Originally Posted by Andrea_85

Hello,

i want to output the weighted average of temperature on a given plane as postProcessing using functionObject (i am using "execFlowFunctionObject -time myTime" to run it as postprocessing). I added these lines to my controlDict:

--> FOAM FATAL ERROR:
 Parser Error for driver SampledSurfaceValueExpressionDriver at "1.1-2" :"field T not existing or of wrong type"
"T*area()/sum(area())"
  ^^
--|

what am i doing wrong?
i am using openfoam 2.3

Thanks,

andrea

[Andrea_85]

I have actually tried both expressions and got the same error, and yes T-field is in "myTime" directory. If i run the simulation and perform the calculation during the run it works with no problems....

andrea

[kera]

Originally Posted by Andrea_85

I have actually tried both expressions and got the same error, and yes T-field is in "myTime" directory. If i run the simulation and perform the calculation during the run it works with no problems....

andrea

then don't load any models. Try to run execFlowFunctionObject in noflow mode

execFlowFunctionObject -noFlow -time yourTime