[sebastien_F1]

Hi,

I'm working on fireFoam and I try to implement a new model. For this model, I need to have access to polynomial Janaf coefficients defined in "constant/thermo.compressibleGas".

My solution was to use a dynamic_cast inside my code as follows :

    // Setup the janaf thermo class
       typedef janafThermo<perfectGas<specie> > janafType;

         typedef sutherlandTransport<sensibleEnthalpy<janafType> > thermoType;

         const multiComponentMixture<thermoType>& myThermo =
         dynamic_cast<const multiComponentMixture<thermoType>&>(this->thermoPtr_());
        
    // O2 thermal enthalpy 
        // Oxygen label
         const label specie_O2 = this->thermoPtr_->composition().species()["O2"];
        // Compute janaf class for O2
         const janafType& myThermo_O2 = dynamic_cast<const janafType&>(myThermo.speciesData()[specie_O2]);
        // Compute molecular thermal enthalpy [J/kmol]               
        scalar H_O2 = myThermo_O2.hs(1e5, Tair_);
        // Compute molecular weight [kg/kmol]
        scalar MW_O2 =  this->thermoPtr_->composition().W(specie_O2);
        // Calculate thermal enthalpy [J/kg]
        scalar hs_O2 = H_O2/MW_O2;
        
        Info << "hs_O2 = " << hs_O2 << endl;

It was working fine in OpenFOAM.2.1 but in OpenFOAM.2.2, I have the following error:
cannot dynamic_cast ... (source type is not polymorphic)

Anyone has a hint how to solve this problem?

Thanks
Sebastien

[zbtlfd]

This thread is quite old, however maybe it's still a useful reply for someone.

The error message "type is not polymorphic" refers at least to the type of
speciesData()[specie_O2] in

const janafType& myThermo_O2 = dynamic_cast<const janafType&>(myThermo.speciesData()[specie_O2]);

, which is usually referred to as "ThermoType" in the source files. In the base classe of the type "ThermoType", i.e. src/thermophysicalModels/specie/specie/specie.H, you can see that it is not a polymorphic type, because it contains no virtual methods. Therefore you cannot downcast from it. At least this is my understanding of the dynamic_cast operation.