SundanceL2Projector.cpp

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// ************************************************************************
// 
//                              Sundance
//                 Copyright (2005) Sandia Corporation
// 
// Copyright (year first published) Sandia Corporation.  Under the terms 
// of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government 
// retains certain rights in this software.
// 
// This library 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
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//  
// This library 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.
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// License along with this library; if not, write to the Free Software
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// Questions? Contact Kevin Long (krlong@sandia.gov), 
// Sandia National Laboratories, Livermore, California, USA
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#include "SundanceL2Projector.hpp"
#include "TSFAztecSolver.hpp"
#include "SundanceOut.hpp"
#include "SundanceTabs.hpp"

#include "SundanceDerivative.hpp"
#include "SundanceTestFunction.hpp"
#include "SundanceUnknownFunction.hpp"
#include "SundanceEssentialBC.hpp"
#include "SundanceIntegral.hpp"
#include "SundanceGaussianQuadrature.hpp"

#include "SundanceCellFilter.hpp"
#include "SundanceMaximalCellFilter.hpp"

using namespace Sundance;
using namespace Sundance;
using namespace Sundance;
using namespace Sundance;
using namespace Teuchos;
using namespace TSFExtended;
using namespace Thyra;


L2Projector::L2Projector(const DiscreteSpace& space, 
                         const Expr& expr, 
                         const LinearSolver<double>& solver)
  : prob_(), solver_()
{
  CoordinateSystem cs = new CartesianCoordinateSystem();
  init(space, cs, expr, solver);
}


L2Projector::L2Projector(const DiscreteSpace& space, 
  const CoordinateSystem& cs,
  const Expr& expr, 
  const LinearSolver<double>& solver)
  : prob_(), solver_()
{
  init(space, cs, expr, solver);
}

L2Projector::L2Projector(const DiscreteSpace& space, 
                         const Expr& expr)
  : prob_(), solver_()
{
  CoordinateSystem cs = new CartesianCoordinateSystem();

  /* Create an Aztec solver for solving the linear subproblems */
  std::map<int,int> azOptions;
  std::map<int,double> azParams;
  
  azOptions[AZ_solver] = AZ_cg;
  azOptions[AZ_precond] = AZ_dom_decomp;
  azOptions[AZ_subdomain_solve] = AZ_icc;
  azOptions[AZ_graph_fill] = 1;
  azOptions[AZ_max_iter] = 1000;
  azOptions[AZ_output] = AZ_none;
  azParams[AZ_tol] = 1.0e-13;
  
  LinearSolver<double> solver = new AztecSolver(azOptions,azParams);

  init(space, cs, expr, solver);
}


L2Projector::L2Projector(const DiscreteSpace& space, 
  const CoordinateSystem& cs,
  const Expr& expr)
  : prob_(), solver_()
{
  /* Create an Aztec solver for solving the linear subproblems */
  std::map<int,int> azOptions;
  std::map<int,double> azParams;
  
  azOptions[AZ_solver] = AZ_cg;
  azOptions[AZ_precond] = AZ_dom_decomp;
  azOptions[AZ_subdomain_solve] = AZ_icc;
  azOptions[AZ_graph_fill] = 1;
  azOptions[AZ_max_iter] = 1000;
  azOptions[AZ_output] = AZ_none;
  azParams[AZ_tol] = 1.0e-13;
  
  LinearSolver<double> solver = new AztecSolver(azOptions,azParams);

  init(space, cs, expr, solver);
}




void L2Projector::init(const DiscreteSpace& space,        
  const CoordinateSystem& coordSys,
  const Expr& expr, 
  const LinearSolver<double>& solver)
{
  TEST_FOR_EXCEPTION(space.basis().size() != expr.size(),
                     RuntimeError,
                     "mismatched vector structure between basis and expr");
  
  TEST_FOR_EXCEPTION(space.basis().size() == 0,
                     RuntimeError,
                     "Empty basis?");
  
  Expr v = new TestFunction(space.basis()[0], "dummy_v[0]");
  Expr u = new UnknownFunction(space.basis()[0], "dummy_u[0]");
  
  for (int i=1; i<space.basis().size(); i++)
    {
      v.append(new TestFunction(space.basis()[i], "dummy_v[" 
                                + Teuchos::toString(i)+"]"));
      u.append(new UnknownFunction(space.basis()[i], "dummy_u[" 
                                + Teuchos::toString(i)+"]"));
    }

  CellFilter interior = new MaximalCellFilter();

  Expr eqn = 0.0;
  Expr J = coordSys.jacobian();

  for (int i=0; i<space.basis().size(); i++)
    {
      eqn = eqn + Integral(space.cellFilters(i), 
                           J*v[i]*(u[i]-expr[i]), 
                           new GaussianQuadrature(4));
    }
  Expr bc;

  prob_ = LinearProblem(space.mesh(), eqn, bc, v, u, space.vecType());
  solver_ = solver;
}