[jf_vt]

Hi
With reactingFoam, I need to know at each time step the total power released by chemical reactions.
The field dQ provides the power released in each cell so I need to sum dQ on all cells.

I try with swak4Foam field expression:

{type swakExpression;
   valueType internalField;
   verbose true;
   expression "dQ";
   writeStartTime no;
   accumulations (sum); }

and get the error:

--> FOAM FATAL ERROR: 
 Parser Error for driver FieldValueExpressionDriver at "1.1-2" :"field dQ not existing or of wrong type"
"dQ"
  ^^

There is a discussion on this forum about this error message but this was related to a custom code.
This happens with 2DcounterFlame tutorial

I understand that this might be related to the fact that dQ has not be created when the function Object calls it ( I am not sure of this) but on the other hand I dont see any options to wait for it.

I tested other fields and they all worked fine with the function object above.

What do I miss?
What are the options to calculate sum(dQ) at runtime for each time step?

Thanks
JF