user_app_NOXObserver_NeumannBCAnalyticSystemTest.hpp

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#ifndef USER_APP_NOX_OBSERVER_NEUMANN_BC_ANALYTIC_SYSTEM_TEST_HPP
#define USER_APP_NOX_OBSERVER_NEUMANN_BC_ANALYTIC_SYSTEM_TEST_HPP

#include "Panzer_config.hpp"

#include "NOX_Abstract_PrePostOperator.H"

#include "Teuchos_RCP.hpp"
#include "NOX_Thyra_Vector.H"
#include "Thyra_DefaultProductVector.hpp"

namespace user_app {
  
  class NOXObserver_NeumannBCAnalyticSystemTest : public NOX::Abstract::PrePostOperator {
    
  public:
    
    NOXObserver_NeumannBCAnalyticSystemTest()
    { 

    }
      
    void runPreIterate(const NOX::Solver::Generic& solver)
    {

    }
    
    void runPostIterate(const NOX::Solver::Generic& solver)
    {

    }
    
    void runPreSolve(const NOX::Solver::Generic& solver)
    {

    }
    
    void runPostSolve(const NOX::Solver::Generic& solver)
    {
      /*
        The Neumann BC Analytic System Test is simple heat conduction
        in the x-direction.  By fixing the flux and thermal
        conductivity, there is an analytic solution with a value of
        2.0 for temperature on the left surface where the neumann
        condition is applied.  We will check exactly one node on this
        boundary and make sure it is within the expected error
        (accounting for discretization error).  

  IMPORTANT: If the global dof numbering scheme changes in the
  future, this test could fail by grabbing the wrong node.
      */

      const NOX::Abstract::Vector& x = solver.getSolutionGroup().getX();
      const NOX::Thyra::Vector* n_th_x = dynamic_cast<const NOX::Thyra::Vector*>(&x);
      TEUCHOS_TEST_FOR_EXCEPTION(n_th_x == NULL, std::runtime_error, "Failed to dynamic_cast to NOX::Thyra::Vector!")
      const ::Thyra::VectorBase<double>& th_x = n_th_x->getThyraVector(); 

      // Assume a single process job (enforced in CMakeLists.txt file)

      const ::Thyra::SpmdVectorBase<double>* th_spmd_x = dynamic_cast<const ::Thyra::SpmdVectorBase<double>* >(&th_x);

      TEUCHOS_TEST_FOR_EXCEPTION(th_spmd_x == NULL, std::runtime_error, "Failed to dynamic_cast to Thyra SPMD vector!");

      Teuchos::ArrayRCP<const double> local_values;
     
      th_spmd_x->getLocalData(outArg(local_values));

//       for (std::size_t i=0; i < local_values.size(); ++i)
//  std::cout << "local_values[" << i << "] = " << local_values[i] << std::endl;

      // linear solve tolerance is 1e-10 and this is a linear problem with a linear basis
      double tol = 1.0e-9;

      TEUCHOS_TEST_FOR_EXCEPTION( std::fabs(local_values[0] - 2.0) > tol, std::runtime_error, "Solution value for Neumann Condition is " << local_values[0] << " and should be 2.0.  The tolerance condition, std::fabs(local_values[0] - 2.0) > tol, where tol is " << tol << " has been violated, causing the test to fail.");

      local_values = Teuchos::null;
   
    }
    
  };
}

#endif