AbstractLinearPdeSolver.hpp

/*

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*/

#ifndef ABSTRACTLINEARPDESOLVER_HPP_
#define ABSTRACTLINEARPDESOLVER_HPP_

#include "LinearSystem.hpp"
#include "BoundaryConditionsContainer.hpp"
#include "AbstractTetrahedralMesh.hpp"
#include "HeartEventHandler.hpp"

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
class AbstractLinearPdeSolver : private boost::noncopyable
{
protected:

    LinearSystem* mpLinearSystem;

    AbstractTetrahedralMesh<ELEMENT_DIM,SPACE_DIM>* mpMesh;

public:

    AbstractLinearPdeSolver(AbstractTetrahedralMesh<ELEMENT_DIM,SPACE_DIM>* pMesh)
        : mpLinearSystem(NULL),
          mpMesh(pMesh)
    {
        assert(pMesh!=NULL);
    }

    virtual ~AbstractLinearPdeSolver()
    {
        if (mpLinearSystem)
        {
            delete mpLinearSystem;
        }
    }

    virtual void InitialiseForSolve(Vec initialSolution = NULL);

    virtual void PrepareForSetupLinearSystem(Vec currentSolution)
    {
    }

    virtual void FinaliseLinearSystem(Vec currentSolution)
    {
    }

    virtual void FollowingSolveLinearSystem(Vec currentSolution)
    {
    }

    virtual void SetupLinearSystem(Vec currentSolution, bool computeMatrix)=0;

    LinearSystem* GetLinearSystem()
    {
        return mpLinearSystem;
    }
};

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
void AbstractLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>::InitialiseForSolve(Vec initialSolution)
{
    if (this->mpLinearSystem == NULL)
    {
        unsigned preallocation=(mpMesh->CalculateMaximumContainingElementsPerProcess() + ELEMENT_DIM);
        if (ELEMENT_DIM > 1)
        {
            // Highest connectivity is closed
            preallocation--;
        }
        preallocation *= PROBLEM_DIM;

        HeartEventHandler::BeginEvent(HeartEventHandler::COMMUNICATION);
        if (initialSolution == NULL)
        {
            /*
             * Static problem, create linear system. The following ensures
             * all the unknowns for a particular node are on the same processor.
             */
            Vec template_vec = mpMesh->GetDistributedVectorFactory()->CreateVec(PROBLEM_DIM);

            this->mpLinearSystem = new LinearSystem(template_vec, preallocation);

            PetscTools::Destroy(template_vec);
        }
        else
        {
            /*
             * Use the current solution (ie the initial solution)
             * as the template in the alternative constructor of
             * LinearSystem. This is to avoid problems with VecScatter.
             */
            this->mpLinearSystem = new LinearSystem(initialSolution, preallocation);
        }

        HeartEventHandler::EndEvent(HeartEventHandler::COMMUNICATION);
    }
}

#endif /*ABSTRACTLINEARPDESOLVER_HPP_*/