ImmersedBoundaryLinearInteractionForce.cpp

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*/
 
#include "ImmersedBoundaryLinearInteractionForce.hpp"
#include "ImmersedBoundaryEnumerations.hpp"
 
template <unsigned DIM>
ImmersedBoundaryLinearInteractionForce<DIM>::ImmersedBoundaryLinearInteractionForce()
    : AbstractImmersedBoundaryForce<DIM>(),
       mSpringConst(1e3),
       mRestLength(0.25),
       mLaminaSpringConstMult(1.0),
       mLaminaRestLengthMult(1.0)
{
}
 
template<unsigned DIM>
ImmersedBoundaryLinearInteractionForce<DIM>::~ImmersedBoundaryLinearInteractionForce()
{
}
 
template <unsigned DIM>
void ImmersedBoundaryLinearInteractionForce<DIM>::AddImmersedBoundaryForceContribution(
    std::vector<std::pair<Node<DIM>*, Node<DIM>*> >& rNodePairs,
    ImmersedBoundaryCellPopulation<DIM>& rCellPopulation)
{
    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());
            double normed_dist = norm_2(vec_a2b);
 
            // Force non-zero only within interaction distance, by definition
            if (normed_dist < rCellPopulation.GetInteractionDistance())
            {
                // Need the average spacing of the containing element; this depends on whether it's a lamina or element
                bool a_lamina = p_node_a->GetRegion() == LAMINA_REGION;
                bool b_lamina = p_node_b->GetRegion() == LAMINA_REGION;
 
                unsigned a_idx = *(p_node_a->ContainingElementsBegin());
                unsigned b_idx = *(p_node_b->ContainingElementsBegin());
 
                double node_a_elem_spacing = a_lamina ? rCellPopulation.rGetMesh().GetAverageNodeSpacingOfLamina(a_idx, false)
                                                      : rCellPopulation.rGetMesh().GetAverageNodeSpacingOfElement(a_idx, false);
 
                double node_b_elem_spacing = b_lamina ? rCellPopulation.rGetMesh().GetAverageNodeSpacingOfLamina(b_idx, false)
                                                      : rCellPopulation.rGetMesh().GetAverageNodeSpacingOfElement(b_idx, false);
 
                double elem_spacing = 0.5 * (node_a_elem_spacing + node_b_elem_spacing);
 
                double eff_spring_const = mSpringConst * elem_spacing / rCellPopulation.GetIntrinsicSpacing();
                double eff_rest_length = mRestLength * rCellPopulation.GetInteractionDistance();
 
                if (a_lamina || b_lamina)
                {
                    eff_spring_const *= mLaminaSpringConstMult;
                    eff_rest_length *= mLaminaRestLengthMult;
                }
 
                /*
                 * 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);
            }
        }
    }
 
    if (this->mAdditiveNormalNoise)
    {
        this->AddNormalNoiseToNodes(rCellPopulation);
    }
}
 
 
template<unsigned DIM>
void ImmersedBoundaryLinearInteractionForce<DIM>::OutputImmersedBoundaryForceParameters(
    out_stream& rParamsFile)
{
    *rParamsFile << "\t\t\t<SpringConstant>" << mSpringConst << "</SpringConstant>\n";
    *rParamsFile << "\t\t\t<RestLength>" << mRestLength << "</RestLength>\n";
    *rParamsFile << "\t\t\t<LaminaSpringConstMult>" << mLaminaSpringConstMult << "</LaminaSpringConstMult>\n";
    *rParamsFile << "\t\t\t<LaminaRestLengthMult>" << mLaminaRestLengthMult << "</LaminaRestLengthMult>\n";
 
    // Call method on direct parent class
    AbstractImmersedBoundaryForce<DIM>::OutputImmersedBoundaryForceParameters(rParamsFile);
}
 
template<unsigned DIM>
double ImmersedBoundaryLinearInteractionForce<DIM>::GetSpringConst() const
{
    return mSpringConst;
}
 
template<unsigned DIM>
void ImmersedBoundaryLinearInteractionForce<DIM>::SetSpringConst(
    double springConst)
{
    mSpringConst = springConst;
}
 
template<unsigned DIM>
double ImmersedBoundaryLinearInteractionForce<DIM>::GetRestLength() const
{
    return mRestLength;
}
 
template<unsigned DIM>
void ImmersedBoundaryLinearInteractionForce<DIM>::SetRestLength(double restLength)
{
    mRestLength = restLength;
}
 
template<unsigned DIM>
double ImmersedBoundaryLinearInteractionForce<DIM>::GetLaminaSpringConstMult() const
{
    return mLaminaSpringConstMult;
}
 
template<unsigned DIM>
void ImmersedBoundaryLinearInteractionForce<DIM>::SetLaminaSpringConstMult(
    double laminaSpringConstMult)
{
    mLaminaSpringConstMult = laminaSpringConstMult;
}
 
template<unsigned DIM>
double ImmersedBoundaryLinearInteractionForce<DIM>::GetLaminaRestLengthMult() const
{
    return mLaminaRestLengthMult;
}
 
template<unsigned DIM>
void ImmersedBoundaryLinearInteractionForce<DIM>::SetLaminaRestLengthMult(
    double laminaRestLengthMult)
{
    mLaminaRestLengthMult = laminaRestLengthMult;
}
 
// Explicit instantiation
template class ImmersedBoundaryLinearInteractionForce<1>;
template class ImmersedBoundaryLinearInteractionForce<2>;
template class ImmersedBoundaryLinearInteractionForce<3>;
 
// Serialization for Boost >= 1.36
#include "SerializationExportWrapperForCpp.hpp"
EXPORT_TEMPLATE_CLASS_SAME_DIMS(ImmersedBoundaryLinearInteractionForce)