ImmersedBoundaryLinearDifferentialAdhesionForce.cpp

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*/
 
#include "ImmersedBoundaryLinearDifferentialAdhesionForce.hpp"
 
#include "CellLabel.hpp"
 
template <unsigned DIM>
ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::ImmersedBoundaryLinearDifferentialAdhesionForce()
    : AbstractImmersedBoundaryForce<DIM>(),
      mLabelledCellToLabelledCellSpringConst(1e3),
      mLabelledCellToCellSpringConst(1e3),
      mCellToCellSpringConst(1e3),
      mRestLength(0.25)
{
}
 
template <unsigned DIM>
void ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::AddImmersedBoundaryForceContribution(
    std::vector<std::pair<Node<DIM>*, Node<DIM>*> >& rNodePairs,
    ImmersedBoundaryCellPopulation<DIM>& rCellPopulation)
{
    if (rCellPopulation.rGetMesh().GetNumLaminas() > 0u)
    {
        EXCEPTION("This force class cannot be used in the presence of lamina elements.");
    }
 
    for (unsigned pair = 0; pair < rNodePairs.size(); ++pair)
    {
        /*
         * Interactions only exist between pairs of nodes that are not in the
         * same boundary / lamina.
         */
        if (rCellPopulation.rGetMesh().NodesInDifferentElementOrLamina(rNodePairs[pair].first, rNodePairs[pair].second))
        {
            Node<DIM>* p_node_a = rNodePairs[pair].first;
            Node<DIM>* p_node_b = rNodePairs[pair].second;
 
            c_vector<double, DIM> vec_a2b = rCellPopulation.rGetMesh().GetVectorFromAtoB(p_node_a->rGetLocation(),
                                                                                         p_node_b->rGetLocation());
            const double normed_dist = norm_2(vec_a2b);
 
            // Force non-zero only within interaction distance, by definition
            if (normed_dist < rCellPopulation.GetInteractionDistance())
            {
                const unsigned a_elem_idx = *(p_node_a->ContainingElementsBegin());
                const unsigned b_elem_idx = *(p_node_b->ContainingElementsBegin());
 
                bool a_cell_labelled = rCellPopulation.GetCellUsingLocationIndex(a_elem_idx)->template HasCellProperty<CellLabel>();
                bool b_cell_labelled = rCellPopulation.GetCellUsingLocationIndex(b_elem_idx)->template HasCellProperty<CellLabel>();
 
                double node_a_elem_spacing = rCellPopulation.rGetMesh().GetAverageNodeSpacingOfElement(a_elem_idx, false);
                double node_b_elem_spacing = rCellPopulation.rGetMesh().GetAverageNodeSpacingOfElement(b_elem_idx, false);
 
                double elem_spacing = 0.5 * (node_a_elem_spacing + node_b_elem_spacing);
 
                // Here we take account of whether the cells are labelled
                double eff_spring_const = elem_spacing / rCellPopulation.GetIntrinsicSpacing();
                if (a_cell_labelled && b_cell_labelled)
                {
                    eff_spring_const *= mLabelledCellToLabelledCellSpringConst;
                }
                else if (a_cell_labelled || b_cell_labelled)
                {
                    eff_spring_const *= mLabelledCellToCellSpringConst;
                }
                else
                {
                    eff_spring_const *= mCellToCellSpringConst;
                }
 
                const double eff_rest_length = mRestLength * rCellPopulation.GetInteractionDistance();
 
                /*
                 * We must scale each applied force by a factor of elem_spacing / local spacing, so that forces
                 * balance when spread to the grid later (where the multiplicative factor is the local spacing)
                 */
                vec_a2b *= eff_spring_const * (normed_dist - eff_rest_length) / normed_dist;
 
                c_vector<double, DIM> force_a2b = vec_a2b * (elem_spacing / node_a_elem_spacing);
                p_node_a->AddAppliedForceContribution(force_a2b);
 
                c_vector<double, DIM> force_b2a = vec_a2b * (-1.0 * elem_spacing / node_b_elem_spacing);
                p_node_b->AddAppliedForceContribution(force_b2a);
            }
        }
    }
}
 
template<unsigned DIM>
void ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::OutputImmersedBoundaryForceParameters(
    out_stream& rParamsFile)
{
    *rParamsFile << "\t\t\t<LabelledCellToLabelledCellSpringConst>" << mLabelledCellToLabelledCellSpringConst << "</LabelledCellToLabelledCellSpringConst>\n";
    *rParamsFile << "\t\t\t<LabelledCellToCellSpringConst>" << mLabelledCellToCellSpringConst << "</LabelledCellToCellSpringConst>\n";
    *rParamsFile << "\t\t\t<CellToCellSpringConst>" << mCellToCellSpringConst << "</CellToCellSpringConst>\n";
    *rParamsFile << "\t\t\t<RestLength>" << mRestLength << "</RestLength>\n";
 
    // Call method on direct parent class
    AbstractImmersedBoundaryForce<DIM>::OutputImmersedBoundaryForceParameters(rParamsFile);
}
 
template<unsigned DIM>
double ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::GetRestLength() const
{
    return mRestLength;
}
 
template<unsigned DIM>
void ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::SetRestLength(
    double restLength)
{
    mRestLength = restLength;
}
 
template<unsigned int DIM>
double ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::GetLabelledCellToLabelledCellSpringConst() const
{
    return mLabelledCellToLabelledCellSpringConst;
}
 
template<unsigned int DIM>
void ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::SetLabelledCellToLabelledCellSpringConst(
        double labelledCellToLabelledCellSpringConst)
{
    mLabelledCellToLabelledCellSpringConst = labelledCellToLabelledCellSpringConst;
}
 
template<unsigned int DIM>
double ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::GetLabelledCellToCellSpringConst() const
{
    return mLabelledCellToCellSpringConst;
}
 
template<unsigned int DIM>
void ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::SetLabelledCellToCellSpringConst(
        double labelledCellToCellSpringConst)
{
    mLabelledCellToCellSpringConst = labelledCellToCellSpringConst;
}
 
template<unsigned int DIM>
double ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::GetCellToCellSpringConst() const
{
    return mCellToCellSpringConst;
}
 
template<unsigned int DIM>
void ImmersedBoundaryLinearDifferentialAdhesionForce<DIM>::SetCellToCellSpringConst(
    double cellToCellSpringConst)
{
    mCellToCellSpringConst = cellToCellSpringConst;
}
 
// Explicit instantiation
template class ImmersedBoundaryLinearDifferentialAdhesionForce<1>;
template class ImmersedBoundaryLinearDifferentialAdhesionForce<2>;
template class ImmersedBoundaryLinearDifferentialAdhesionForce<3>;
 
// Serialization for Boost >= 1.36
#include "SerializationExportWrapperForCpp.hpp"
EXPORT_TEMPLATE_CLASS_SAME_DIMS(ImmersedBoundaryLinearDifferentialAdhesionForce)