dd_convection.cc File Reference

#include "generic.h"
#include "db_navier_st_elements.h"
#include "meshes/rectangular_quadmesh.h"

Classes
class	ConvectionProblem< NST_ELEMENT, AD_ELEMENT >

Namespaces
	Global_Physical_Variables
	Global variables.

Functions
int	main (int argc, char **argv)
	Driver code for 2D Boussinesq convection problem. More...

Variables
double	Global_Physical_Variables::Lewis = 10.0
	The Lewis number. More...
Vector< double >	Global_Physical_Variables::Diff (2, 1.0) = 1.0/Pe
	Double relative diffusivities. More...
double	Global_Physical_Variables::Rayleigh_T = 1800.0
double	Global_Physical_Variables::Rayleigh_S = -1000
	Solutal Rayleigh number. More...
double	Global_Physical_Variables::Lambda = 1.414
	Length of domain. More...
Vector< double >	Global_Physical_Variables::Direction_of_gravity (2)
	Gravity vector. More...

Function Documentation

main()

int main	(	int argc	,
		char **	argv
	)

Driver code for 2D Boussinesq convection problem.

{
 
 // Set the direction of gravity
 Global_Physical_Variables::Direction_of_gravity[0] = 0.0;
 Global_Physical_Variables::Direction_of_gravity[1] = -1.0;
 
 //Set the diffusivity of the solute to be the inverse Lewis number
 Global_Physical_Variables::Diff[1] = 1.0/Global_Physical_Variables::Lewis;
 
 //Construct our problem
 ConvectionProblem<DoubleBuoyantQCrouzeixRaviartElement<2> > problem;
 
 // Apply the boundary condition at time zero
 problem.set_boundary_conditions(0.0);
 
 //Perform a single steady Newton solve
 problem.steady_newton_solve();
 
 //Document the solution
 problem.doc_solution();
 
 //Start a trace file
 ofstream trace("RESLT/trace.dat");
 //Local variables for the kinetic energy and its rate of change
 double E=0.0, Edot = 0.0;
 
 
 //Output to the trace file
 problem.get_kinetic_energy(E,Edot);
 trace << problem.time_pt()->time() << " " 
       << problem.mesh_pt()->boundary_node_pt(1,8)->value(1) << " " 
       << E << " " << Edot << std::endl;
 
 
 //Set the timestep
 double dt = 0.01;
 
 //Initialise the value of the timestep and set an impulsive start
 problem.assign_initial_values_impulsive(dt);
 
 //Set the number of timesteps to our default value
 unsigned n_steps = 2000;
 
 //If we have a command line argument, perform fewer steps 
 //(used for self-test runs)
 if(argc > 1) {n_steps = 5;}
 
 //Perform n_steps timesteps
 for(unsigned i=0;i<n_steps;++i)
  {
   problem.unsteady_newton_solve(dt);
   //Document the solution
   problem.doc_solution();
   //Output to the trace file
   problem.get_kinetic_energy(E,Edot);
   trace << problem.time_pt()->time() << " " 
         << problem.mesh_pt()->boundary_node_pt(1,8)->value(1) << " "
         << E << " " << Edot << std::endl;
   
  }
 
 trace.close();
} // end of main

References Global_Physical_Variables::Diff, oomph::Global_Physical_Variables::Direction_of_gravity, Global_Physical_Variables::E, i, Global_Physical_Variables::Lewis, and problem.