ViscosityCalculator.cpp

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#include "Owen11Parameters.hpp"
#include "ViscosityCalculator.hpp"
#include "UnitCollection.hpp"

template<unsigned DIM>
ViscosityCalculator<DIM>::ViscosityCalculator() : AbstractVesselNetworkCalculator<DIM>(),
    mPlasmaViscosity(Owen11Parameters::mpPlasmaViscosity->GetValue("ViscosityCalculator"))
{

}

template<unsigned DIM>
ViscosityCalculator<DIM>::~ViscosityCalculator()
{

}

template <unsigned DIM>
boost::shared_ptr<ViscosityCalculator<DIM> > ViscosityCalculator<DIM>::Create()
{
    MAKE_PTR(ViscosityCalculator<DIM>, pSelf);
    return pSelf;
}

template<unsigned DIM>
void ViscosityCalculator<DIM>::SetPlasmaViscosity(units::quantity<unit::dynamic_viscosity> visocity)
{
    mPlasmaViscosity = visocity;
}

template<unsigned DIM>
void ViscosityCalculator<DIM>::Calculate()
{
    std::vector<boost::shared_ptr<VesselSegment<DIM> > > segments = this->mpNetwork->GetVesselSegments();
    for (unsigned segment_index = 0; segment_index < segments.size(); segment_index++)
    {
        units::quantity<unit::length> radius = segments[segment_index]->GetRadius();
        units::quantity<unit::dimensionless> haematocrit = segments[segment_index]->GetFlowProperties()->GetHaematocrit();

        // This equation assumes the radius is in micron so manually converted. No dimensional checking is done here, it may not
        // even be possible for this equation.
        double micron_radius = (radius/unit::metres)*1.e6;
        double power_term_1 = 1.0 / (1.0 + pow(10.0, -11.0) * pow(2.0 * micron_radius, 12));

        double c = (0.8 + exp(-0.15 * micron_radius)) * (power_term_1 - 1) + power_term_1;
        double mu_45 = 6.0 * exp(-0.17 * micron_radius) + 3.2 - 2.44 * exp(-0.06 * pow(2 * micron_radius, 0.645));

        double power_term_2 = pow((2.0 * micron_radius / (2.0 * micron_radius - 1.1)), 2.0);
        double mu_rel = (1.0
                + (mu_45 - 1.0) * (((pow((1.0 - haematocrit), c)) - 1) / ((pow((1.0 - 0.45), c)) - 1.0)) * power_term_2) * power_term_2;

        segments[segment_index]->GetFlowProperties()->SetViscosity(mPlasmaViscosity*mu_rel);
    }
}

// Explicit instantiation
template class ViscosityCalculator<2> ;
template class ViscosityCalculator<3> ;