AbstractDynamicLinearPdeSolver.hpp

/*

Copyright (C) University of Oxford, 2005-2010

University of Oxford means the Chancellor, Masters and Scholars of the
University of Oxford, having an administrative office at Wellington
Square, Oxford OX1 2JD, UK.

This file is part of Chaste.

Chaste is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 2.1 of the License, or
(at your option) any later version.

Chaste is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details. The offer of Chaste under the terms of the
License is subject to the License being interpreted in accordance with
English Law and subject to any action against the University of Oxford
being under the jurisdiction of the English Courts.

You should have received a copy of the GNU Lesser General Public License
along with Chaste. If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef ABSTRACTDYNAMICLINEARPDESOLVER_HPP_
#define ABSTRACTDYNAMICLINEARPDESOLVER_HPP_

#include "TimeStepper.hpp"
#include "AbstractLinearPdeSolver.hpp"
#include "PdeSimulationTime.hpp"


template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
class AbstractDynamicLinearPdeSolver : public AbstractLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>
{
protected:
    double mTstart;

    double mTend;

    double mDt;

    double mDtInverse;

    bool mTimesSet;

    Vec mInitialCondition;

    bool mMatrixIsAssembled;

    bool mMatrixIsConstant;


public:
    AbstractDynamicLinearPdeSolver(AbstractTetrahedralMesh<ELEMENT_DIM,SPACE_DIM>* pMesh);

    void SetTimes(double tStart, double tEnd, double dt);

    void SetInitialCondition(Vec initialCondition);

    Vec Solve();
};    


template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
AbstractDynamicLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>::AbstractDynamicLinearPdeSolver(AbstractTetrahedralMesh<ELEMENT_DIM,SPACE_DIM>* pMesh)
    : AbstractLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>(pMesh),
      mTimesSet(false),
      mInitialCondition(NULL),
      mMatrixIsAssembled(false),
      mMatrixIsConstant(false)
      
{
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
void AbstractDynamicLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>::SetTimes(double tStart, double tEnd, double dt)
{
    mTstart = tStart;
    mTend   = tEnd;
    mDt     = dt;

    if (mTstart >= mTend)
    {
        EXCEPTION("Starting time has to less than ending time");
    }

    if (mDt <= 0)
    {
        EXCEPTION("Time step has to be greater than zero");
    }

    mDtInverse = 1/dt;
    mTimesSet = true;
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
void AbstractDynamicLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>::SetInitialCondition(Vec initialCondition)
{
    assert(initialCondition!=NULL);
    mInitialCondition = initialCondition;
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
Vec AbstractDynamicLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>::Solve()
{
    assert(mTimesSet);
    assert(mInitialCondition != NULL);

    this->InitialiseForSolve(mInitialCondition);

    TimeStepper stepper(mTstart, mTend, mDt, mMatrixIsConstant);

    Vec current_solution = mInitialCondition;
    Vec next_solution;

    while ( !stepper.IsTimeAtEnd() )
    {
        mDt = stepper.GetNextTimeStep();
        mDtInverse = 1.0/mDt;

        PdeSimulationTime::SetTime(stepper.GetTime());

        this->PrepareForSetupLinearSystem(current_solution);

        bool compute_matrix = (!mMatrixIsConstant || !mMatrixIsAssembled);
        this->SetupLinearSystem(current_solution, compute_matrix);
       
        this->FinaliseLinearSystem(current_solution);
    
        next_solution = this->mpLinearSystem->Solve(current_solution);

        if (mMatrixIsConstant)
        {
            mMatrixIsAssembled = true;
        }

        stepper.AdvanceOneTimeStep();

        // Avoid memory leaks
        if (current_solution != mInitialCondition)
        {
            HeartEventHandler::BeginEvent(HeartEventHandler::COMMUNICATION);
            VecDestroy(current_solution);
            HeartEventHandler::EndEvent(HeartEventHandler::COMMUNICATION);
        }
        current_solution = next_solution;
    }
    return current_solution;
}


#endif /*ABSTRACTDYNAMICLINEARPDESOLVER_HPP_*/

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