rayleigh_instability.cc File Reference

#include "generic.h"
#include "axisym_navier_stokes.h"
#include "fluid_interface.h"
#include "meshes/horizontal_single_layer_spine_mesh.h"

Classes
class	InterfaceProblem< ELEMENT, TIMESTEPPER >
	Single axisymmetric fluid interface problem in rectangular domain. More...

Namespaces
	Global_Physical_Variables
	Global variables.

Functions
int	main (int argc, char *argv[])
	Driver code for single fluid axisymmetric horizontal interface problem. More...

Variables
double	Global_Physical_Variables::ReSt = 5.0
	Womersley number. More...
double	Global_Physical_Variables::Epsilon = 0.1
	Free surface cosine deform parameter. More...
ofstream	Global_Physical_Variables::Pvd_file
Vector< double >	Global_Physical_Variables::G (3) = 1.0
	Direction of gravity. More...

Function Documentation

main()

int main	(	int argc	,
		char *	argv[]
	)

Driver code for single fluid axisymmetric horizontal interface problem.

//////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////

Maximum time

Duration of timestep

{
 
 // Store command line arguments
 CommandLineArgs::setup(argc,argv);
 
 double t_max = 1.8;
 
 const double dt = 0.05;
 
 // If we are doing validation run, use smaller number of timesteps
 if(CommandLineArgs::Argc>1) 
  { 
   t_max = 0.1; 
  }
 
 // Number of elements in radial (r) direction
 const unsigned n_r = 10;
   
 // Number of elements in axial (z) direction
 const unsigned n_z = 10;
 
 // Width of domain
 const double l_r = 1.0;
 
 // Height of fluid layer
 const double h = 3.0*MathematicalConstants::Pi;
 
 // Set direction of gravity (vertically downwards)
 Global_Physical_Variables::G[0] = 0.0;
 Global_Physical_Variables::G[1] = -1.0;
 Global_Physical_Variables::G[2] = 0.0;
 
 // Set up the spine test problem with AxisymmetricQCrouzeixRaviartElements,
 // using the BDF<2> timestepper
 InterfaceProblem<SpineElement<AxisymmetricQCrouzeixRaviartElement >,BDF<2> >
  problem(n_r,n_z,l_r,h);
 
 // Run the unsteady simulation
 problem.unsteady_run(t_max,dt);
 
} // End of main

References oomph::CommandLineArgs::Argc, Global_Physical_Variables::G, BiharmonicTestFunctions2::Pi, problem, and Flag_definition::setup().