freeflow/rans/zeroeq/volumevariables.hh

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#ifndef DUMUX_ZEROEQ_VOLUME_VARIABLES_HH
#define DUMUX_ZEROEQ_VOLUME_VARIABLES_HH
 
#include <string>
 
#include <dune/common/exceptions.hh>
#include <dumux/freeflow/rans/volumevariables.hh>
 
namespace Dumux {
 
template <class Traits, class NSVolumeVariables>
class ZeroEqVolumeVariables
: public RANSVolumeVariables< Traits, NSVolumeVariables>
{
    using RANSParentType = RANSVolumeVariables<Traits, NSVolumeVariables>;
 
    using Scalar = typename Traits::PrimaryVariables::value_type;
 
public:
    using Indices = typename Traits::ModelTraits::Indices;
 
    template<class ElementSolution, class Problem, class Element, class SubControlVolume>
    void update(const ElementSolution &elemSol,
                const Problem &problem,
                const Element &element,
                const SubControlVolume& scv)
    {
        RANSParentType::updateNavierStokesVolVars(elemSol, problem, element, scv);
        updateRANSProperties(elemSol, problem, element, scv);
    }
 
    template<class ElementSolution, class Problem, class Element, class SubControlVolume>
    void updateRANSProperties(const ElementSolution &elemSol,
                              const Problem &problem,
                              const Element &element,
                              const SubControlVolume& scv)
    {
        RANSParentType::updateRANSProperties(elemSol, problem, element, scv);
        additionalRoughnessLength_ = problem.additionalRoughnessLength(RANSParentType::elementIdx());
        yPlusRough_ = wallDistanceRough() * RANSParentType::uStar() / RANSParentType::kinematicViscosity();
        RANSParentType::setDynamicEddyViscosity_(calculateEddyViscosity(elemSol, problem, element, scv, problem.eddyViscosityModel()));
        RANSParentType::calculateEddyDiffusivity(problem);
        RANSParentType::calculateEddyThermalConductivity(problem);
    }
 
    template<class ElementSolution, class Problem, class Element, class SubControlVolume>
    Scalar calculateEddyViscosity(const ElementSolution &elemSol,
                                  const Problem &problem,
                                  const Element &element,
                                  const SubControlVolume& scv,
                                  const std::string modelName)
    {
        using std::abs;
        using std::exp;
        using std::sqrt;
        Scalar kinematicEddyViscosity = 0.0;
        unsigned int flowDirectionAxis = problem.flowDirectionAxis(RANSParentType::elementIdx());
        unsigned int wallNormalAxis = problem.wallNormalAxis(RANSParentType::elementIdx());
        Scalar velGrad = abs(RANSParentType::velocityGradients()[flowDirectionAxis][wallNormalAxis]);
 
        if (modelName.compare("none") == 0)
        {
            // kinematicEddyViscosity = 0.0
        }
        else if (modelName.compare("prandtl") == 0)
        {
            Scalar mixingLength = problem.karmanConstant() * wallDistanceRough();
            kinematicEddyViscosity = mixingLength * mixingLength * velGrad;
        }
        else if (modelName.compare("vanDriest") == 0)
        {
            Scalar mixingLength = problem.karmanConstant() * wallDistanceRough()
                                  * (1.0 - exp(-yPlusRough() / 26.0))
                                  / sqrt(1.0 - exp(-0.26 * yPlusRough()));
            kinematicEddyViscosity = mixingLength * mixingLength * velGrad;
        }
        else if (modelName.compare("baldwinLomax") == 0)
        {
            kinematicEddyViscosity = problem.kinematicEddyViscosity(RANSParentType::elementIdx());
        }
        else
        {
            DUNE_THROW(Dune::NotImplemented,
                       "The eddy viscosity model \"" << modelName << "\" is not implemented.");
        }
 
        return kinematicEddyViscosity * RANSParentType::density();
    }
 
    Scalar wallDistanceRough() const
    { return RANSParentType::wallDistance() + additionalRoughnessLength_; }
 
    Scalar yPlusRough() const
    { return yPlusRough_; }
 
protected:
    Scalar additionalRoughnessLength_ = 0.0;
    Scalar yPlusRough_ = 0.0;
};
 
} // end namespace Dumux
 
#endif