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How to compute mass flow rate in OpenFOAM

Mass flow rate output for fan, HVC and through radiator with OpenFOAM

For outputting the mass flow rate a function object is activated by adding an entry in system/controlDict of a case:

functions

(

   massFlow

   {

      type patchMassFlow;

     functionObjectLibs

       (

         "libsimpleFunctionObjects.so"

       );

     verbose true;

     patches

       (

         inlet

         outlet

       );

     factor 1.;

   }

);

·         The entries pre-defined by the OpenFOAM-functionObject mechanism are

·         functionObjectLibs : Libraries that have to be loaded in order for this functionObject to work

·         type:  the type of the function object  Standard entries (not all have to be defined) for the  

In place of type patchMassFlow you can also use the following patch type to be able to output what you want:

Currently the functionObjects in the library fall in two categories (the names should speak for themselves):

·       per-patch calculations:

·       patchAverage; does an area-weighted averaging of a field

·       patchFieldFlow; does a mass-flux-weighted integration of a field

·       patchForce (has been removed for the-version because a similar facility is included with the release)

·       patchIntegrate; does an area-weighted integration of a field

·       patchMassFlowAverage (has been included for the); does a mass-flux-weighted averaging of a field

·       patchMassFlow; computes the mass-flux through a patch

·       total-volume calculations:

·       volumeAverage (has been removed for theversion because a similar facility is included with the release - and is now being reintroduced because the average-functionObject in OpenFOAM does time-averaging)

·       volumeIntegrate

·       volumeMinMax

·       misc

·       panicDump: Dumps all available data if a field exceeds certain bounds ans finishes the simulation

·       sample

·       sampleSurface (has been removed for theversion because a similar facility is included with the release)

·       extended fields writing

·       writeFieldsOften: lets the user specify an additional set of fields that is to be written more frequently than specified in the controlDict