two_d_spectral_adapt.cc File Reference

#include "generic.h"
#include "poisson.h"
#include "meshes/simple_rectangular_quadmesh.h"

Classes
class	SimpleRefineableRectangularQuadMesh< ELEMENT >
class	RefineablePoissonProblem< ELEMENT >

Namespaces
	TanhSolnForPoisson
	Namespace for exact solution for Poisson equation with "sharp step".

Functions
void	TanhSolnForPoisson::get_exact_u (const Vector< double > &x, Vector< double > &u)
	Exact solution as a Vector. More...
void	TanhSolnForPoisson::get_source (const Vector< double > &x, double &source)
	Source function to make it an exact solution. More...
int	main ()
	Driver code for 2D Poisson problem. More...

Function Documentation

main()

int main

(

)

Driver code for 2D Poisson problem.

{
 //Set up the problem
 //------------------
 
 // Create the problem with 2D nine-node refineable elements from the
 // RefineableQuadPoissonElement family. Pass pointer to source function. 
 RefineablePoissonProblem<RefineableQSpectralPoissonElement<2,5> > 
  problem(&TanhSolnForPoisson::get_source);
 
 // Create label for output
 //------------------------
 DocInfo doc_info;
 
 // Set output directory
 doc_info.set_directory("RESLT_2d");
 
 // Step number
 doc_info.number()=0;
 
 // Check if we're ready to go:
 //----------------------------
 cout << "\n\n\nProblem self-test ";
 if (problem.self_test()==0) 
  {
   cout << "passed: Problem can be solved." << std::endl;
  }
 else 
  {
   throw OomphLibError("Self test failed",
                       OOMPH_CURRENT_FUNCTION,
                       OOMPH_EXCEPTION_LOCATION);
  }
 
 
 problem.mesh_pt()->output("initial.dat");
 
 // Set the orientation of the "step" to 45 degrees
 TanhSolnForPoisson::TanPhi=1.0;
 
 // Choose a large value for the steepness of the "step"
 TanhSolnForPoisson::Alpha=50.0; 
 
 //Solve the problem, performing up to 4 adaptive refinements
 problem.newton_solve(4);
 
 //Output the solution
 problem.doc_solution(doc_info);
 
} //end of main

References TanhSolnForPoisson::Alpha, TanhSolnForPoisson::get_source(), oomph::DocInfo::number(), OOMPH_CURRENT_FUNCTION, OOMPH_EXCEPTION_LOCATION, problem, oomph::DocInfo::set_directory(), and TanhSolnForPoisson::TanPhi.