onestep/jacobianapplyengine.hh

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// -*- tab-width: 2; indent-tabs-mode: nil -*-
// vi: set et ts=2 sw=2 sts=2:
#ifndef DUNE_PDELAB_GRIDOPERATOR_ONESTEP_JACOBIANAPPLYENGINE_HH
#define DUNE_PDELAB_GRIDOPERATOR_ONESTEP_JACOBIANAPPLYENGINE_HH
 
#include <dune/pdelab/gridoperator/onestep/enginebase.hh>
#include <cmath>
 
namespace Dune{
  namespace PDELab{
 
    template<typename OSLA>
    class OneStepLocalJacobianApplyAssemblerEngine
      : public OneStepLocalAssemblerEngineBase<OSLA,
                                               typename OSLA::LocalAssemblerDT0::LocalJacobianApplyAssemblerEngine,
                                               typename OSLA::LocalAssemblerDT1::LocalJacobianApplyAssemblerEngine
                                               >
    {
      typedef OneStepLocalAssemblerEngineBase<OSLA,
                                              typename OSLA::LocalAssemblerDT0::LocalJacobianApplyAssemblerEngine,
                                              typename OSLA::LocalAssemblerDT1::LocalJacobianApplyAssemblerEngine
                                              > BaseT;
 
      using BaseT::la;
      using BaseT::lae0;
      using BaseT::lae1;
      using BaseT::implicit;
      using BaseT::setLocalAssemblerEngineDT0;
      using BaseT::setLocalAssemblerEngineDT1;
    public:
      typedef OSLA LocalAssembler;
 
      typedef typename OSLA::LocalAssemblerDT0 LocalAssemblerDT0;
      typedef typename OSLA::LocalAssemblerDT1 LocalAssemblerDT1;
 
      typedef typename LocalAssemblerDT0::LocalJacobianApplyAssemblerEngine JacobianEngineDT0;
      typedef typename LocalAssemblerDT1::LocalJacobianApplyAssemblerEngine JacobianEngineDT1;
 
      typedef typename OSLA::Traits::Range Range;
 
      typedef typename OSLA::Traits::Domain Domain;
 
      typedef typename OSLA::Real Real;
 
      OneStepLocalJacobianApplyAssemblerEngine(LocalAssembler& local_assembler_)
        : BaseT(local_assembler_)
        , invalid_result(nullptr)
        , invalid_solution(nullptr)
        , invalid_update(nullptr)
        , result(invalid_result)
        , solution(invalid_solution)
        , update(invalid_update)
      {}
 
      void setSolution(const Domain& solution_)
      {
        solution = &solution_;
      }
 
      void setUpdate(const Domain& update_)
      {
        update = &update_;
      }
 
      void setResult(Range& result_)
      {
        result = &result_;
 
        // Initialize the engines of the two wrapped local assemblers
        assert(update != invalid_update);
        setLocalAssemblerEngineDT0
          (la.la0.localJacobianApplyAssemblerEngine(*solution,*update,*result));
        setLocalAssemblerEngineDT1
          (la.la1.localJacobianApplyAssemblerEngine(*solution,*update,*result));
      }
 
      void setWeights()
      {
        la.la0.setWeight(b_rr * la.dt_factor0);
        la.la1.setWeight(la.dt_factor1);
      }
 
      void preAssembly()
      {
        lae0->preAssembly();
        lae1->preAssembly();
 
        // Extract the coefficients of the time step scheme
        b_rr = la.osp_method->b(la.stage,la.stage);
        d_r = la.osp_method->d(la.stage);
 
        // Here we only want to know whether this stage is implicit
        using std::abs;
        implicit = abs(b_rr) > 1e-6;
 
        // prepare local operators for stage
        la.la0.setTime(la.time + d_r * la.dt);
        la.la1.setTime(la.time + d_r * la.dt);
 
        setWeights();
      }
 
      template<typename GFSU, typename GFSV>
      void postAssembly(const GFSU& gfsu, const GFSV& gfsv)
      {
        lae0->postAssembly(gfsu,gfsv);
        lae1->postAssembly(gfsu,gfsv);
      }
 
    private:
 
      Range * const invalid_result;
 
      Domain * const invalid_solution;
 
      Domain * const invalid_update;
 
      Range * result;
 
      const Domain * solution;
 
      const Domain * update;
 
      Real b_rr, d_r;
 
    }; // end class OneStepLocalJacobianApplyAssemblerEngine
 
  } // end namespace PDELab
} // end Dune
#endif