linear_solid_contact_with_gravity.cc File Reference

#include <fenv.h>
#include "generic.h"
#include "solid.h"
#include "linear_elasticity.h"
#include "meshes/triangle_mesh.h"
#include "meshes/rectangular_quadmesh.h"
#include "contact_elements.h"

Classes
class	FiniteElementComp
class	WarpedLine
	Warped line in 2D space. More...
class	CircularPenetratorElement
class	ContactProblem< ELEMENT >
	Problem class. More...

Namespaces
	ProblemParameters
	Namespace for exact solution and problem parameters.

Functions
void	ProblemParameters::body_force (const double &time, const Vector< double > &x, Vector< double > &result)
	The body force function. More...
int	main (int argc, char *argv[])
	Driver code. More...

Variables
double	ProblemParameters::Body_force_amplitude =0.0
	Body force magnitude. More...
double	ProblemParameters::Body_force_alpha =1.0e4
WarpedLine	ProblemParameters::Boundary_geom_object_left (1.0e-10, 0.0, X_contact_end_left)
WarpedLine	ProblemParameters::Boundary_geom_object_contact (1.0e-10, X_contact_end_left, X_contact_end_right)
WarpedLine	ProblemParameters::Boundary_geom_object_right (1.0e-10, X_contact_end_right, 1.0)
IsotropicElasticityTensor	ProblemParameters::E (Nu)
	The elasticity tensor. More...

Function Documentation

main()

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

Driver code.

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

{
 
 FiniteElement::Accept_negative_jacobian=true;
 
 // Store command line arguments
 CommandLineArgs::setup(argc,argv);
 
 // Define possible command line arguments and parse the ones that
 // were actually specified
 
 // Suppress adaptation
 CommandLineArgs::specify_command_line_flag("--no_adapt");
    
 // Initial element size
 CommandLineArgs::specify_command_line_flag("--el_area",
                                            &ProblemParameters::El_area);
    
 // Suppress adaptation
 CommandLineArgs::specify_command_line_flag("--validate");
    
 // Parse command line
 CommandLineArgs::parse_and_assign(); 
 
 // Doc what has actually been specified on the command line
 CommandLineArgs::doc_specified_flags();
 
 // Create generalised Hookean constitutive equations
 ProblemParameters::Constitutive_law_pt = 
  new GeneralisedHookean(&ProblemParameters::Nu);
      
 
 // Define centre of penetrator
 ProblemParameters::Centre.resize(2);
 ProblemParameters::Centre[0]=0.5;
 ProblemParameters::Centre[1]=1.0+ProblemParameters::Radius;
 
 // Build penetrator
 ProblemParameters::Penetrator_pt =
  new CircularPenetrator(&ProblemParameters::Centre,
                         ProblemParameters::Radius);
 
 
#ifdef STRUCTURED_MESH
 
 // Build problem
 ContactProblem<RefineablePseudoSolidNodeUpdateElement<
  RefineableQLinearElasticityElement<2,3>,
  RefineableQPVDElement<2,3> > >
  problem;
 
#else
 
 // Build problem
 ContactProblem
  <ProjectableLinearElasticityElement<
 PseudoSolidNodeUpdateElement<TLinearElasticityElement<2,3>,
                              TPVDElement<2,3> > > > problem;
 
#endif
 
 
 // Pure imposed displacement of upper surface -- no contact
 //---------------------------------------------------------
 {
  // Doc initial domain shape
  problem.doc_solution();
  
  // Max. number of adaptations per solve
  unsigned max_adapt=1; 
  
  //Parameter incrementation
  unsigned nstep=2; 
  for(unsigned i=0;i<nstep;i++)
   {
    
    double d_ampl=0.05;
    double ampl=0.0;
 
#ifdef STRUCTURED_MESH
    
    // Increment imposed boundary displacement
    ProblemParameters::Boundary_geom_object.ampl()+=d_ampl;
    ampl=ProblemParameters::Boundary_geom_object.ampl();
 
#else
    
    // Increment imposed boundary displacement
    ProblemParameters::Boundary_geom_object_left.ampl()+=d_ampl;
    ProblemParameters::Boundary_geom_object_contact.ampl()+=d_ampl;
    ProblemParameters::Boundary_geom_object_right.ampl()+=d_ampl;
    ampl=ProblemParameters::Boundary_geom_object_contact.ampl();
        
#endif
    
    oomph_info << "Re-solving for prescr displ amplitude = "
               << ampl << std::endl;
  
    // Solve the problem with Newton's method, allowing
    // up to max_adapt mesh adaptations after every solve.
    problem.newton_solve(max_adapt);
    
    // Doc solution
    problem.doc_solution();
   }
 }
 
 
#ifdef STRUCTURED_MESH
 ProblemParameters::Centre[1]=
  ProblemParameters::Boundary_geom_object.y_c()- 
  ProblemParameters::Boundary_geom_object.radius()+
  ProblemParameters::Radius;
#else
 ProblemParameters::Centre[1]=
  ProblemParameters::Boundary_geom_object_contact.y_c()- 
  ProblemParameters::Boundary_geom_object_contact.radius()+
  ProblemParameters::Radius;
#endif
 
 
  //Output initial condition
 problem.doc_solution();
 
 unsigned max_adapt=1;
 if (CommandLineArgs::command_line_flag_has_been_set("--no_adapt"))
  {
   max_adapt=0;
  }
 
 
 // Move position of centre directly
 //----------------------------------
 
 double dyc=0.00024; 
 unsigned nstep=3;
 for (unsigned i=0;i<nstep;i++)
  {
   ProblemParameters::Centre[1]-=dyc;
   oomph_info << "Re-solving imposed circle pos for yc=" 
              << ProblemParameters::Centre[1]
              << std::endl;
 
   // Solve
   problem.newton_solve(max_adapt);
   
   //Output solution
   problem.doc_solution();
  }
 
 
 // Now increase resolution
 //------------------------ 
 nstep=3;
 for (unsigned i=0;i<nstep;i++)
 {
 
  oomph_info << "Re-solving imposed circle pos for element length factor: "
             << ProblemParameters::Element_length_factor
             << std::endl;
 
  // Re-solve
  problem.newton_solve(max_adapt);
  
  //Output solution
  problem.doc_solution();
 
  // Refine 
  ProblemParameters::Element_length_factor/=2.0;
 }
 
 // Switch to node control
 ProblemParameters::Impose_position_of_centre=false;
 
 // Use displacement control initially
 //-----------------------------------
 problem.adapt();
 problem.switch_to_displ_control();
 dyc=0.0003; 
 nstep=1;
 for (unsigned i=0;i<nstep;i++)
  {
   ProblemParameters::Y_c-=dyc;
   oomph_info << "Re-solving for yc=" 
              << ProblemParameters::Y_c
              << std::endl;
 
   // Solve
   problem.newton_solve(max_adapt);
   
   //Output solution
   problem.doc_solution();
  }
 
 
 // Switch to force control
 problem.switch_to_force_control();
 
 // Balance it in the horizontal direction
 //---------------------------------------
 ProblemParameters::Horizontal_force=0.0;
 
 oomph_info << "RE-solving for weight=" 
            << dynamic_cast<CircularPenetratorElement*>(
             ProblemParameters::Penetrator_pt)->target_weight() 
            << " and horizontal force: "
            << dynamic_cast<CircularPenetratorElement*>(
             ProblemParameters::Penetrator_pt)->target_horizontal_force() 
            << std::endl;
 
 // Re-solve
 problem.newton_solve(max_adapt);
 
 //Output solution
 problem.doc_solution();
 
 
 // Now increase weight
 //-------------------- 
 double dweight=0.0001; 
 nstep=1;
 for (unsigned i=0;i<nstep;i++)
  {
   oomph_info << "Re-solving for weight=" 
              << dynamic_cast<CircularPenetratorElement*>(
               ProblemParameters::Penetrator_pt)->target_weight() 
              << " and horizontal force: "
              << dynamic_cast<CircularPenetratorElement*>(
               ProblemParameters::Penetrator_pt)->target_horizontal_force() 
              << std::endl;
   
   // Re-solve
   problem.newton_solve(max_adapt);
   
   //Output solution
   problem.doc_solution();
   
   // Increase weight
   ProblemParameters::Weight+=dweight;
  }
 
 
// Now detach elastic body
//------------------------
 nstep=3;
 double d_lift_off_ampl=0.0001;
 for (unsigned i=0;i<nstep;i++)
  {
 
   double lift_off=0.0;
 
#ifdef STRUCTURED_MESH
    
    // Increment imposed boundary displacement
    ProblemParameters::Boundary_geom_object.lift_off_amplitude()+=
     d_lift_off_ampl;
 
    lift_off=ProblemParameters::Boundary_geom_object.lift_off_amplitude();
    
#else
    
    // Increment imposed boundary displacement
    ProblemParameters::Boundary_geom_object_left.lift_off_amplitude()+= 
     d_lift_off_ampl;
    ProblemParameters::Boundary_geom_object_contact.lift_off_amplitude()+=
     d_lift_off_ampl;
    ProblemParameters::Boundary_geom_object_right.lift_off_amplitude()+=
     d_lift_off_ampl;
 
    lift_off=ProblemParameters::Boundary_geom_object_contact.
     lift_off_amplitude();
    
#endif
 
 
  oomph_info << "Re-solving for weight=" 
              << dynamic_cast<CircularPenetratorElement*>(
               ProblemParameters::Penetrator_pt)->target_weight() 
              << " and horizontal force: "
              << dynamic_cast<CircularPenetratorElement*>(
               ProblemParameters::Penetrator_pt)->target_horizontal_force() 
              << " and lift off: "
              << lift_off
              << std::endl;
  
  // Re-solve
  problem.newton_solve(max_adapt);
  
  //Output solution
  problem.doc_solution();
 }
}

References WarpedLine::ampl(), Global_Physical_Variables::Boundary_geom_object, ProblemParameters::Boundary_geom_object_contact, ProblemParameters::Boundary_geom_object_left, ProblemParameters::Boundary_geom_object_right, ProblemParameters::Centre, oomph::CommandLineArgs::command_line_flag_has_been_set(), ProblemParameters::Constitutive_law_pt, oomph::CommandLineArgs::doc_specified_flags(), ProblemParameters::El_area, ProblemParameters::Element_length_factor, ProblemParameters::Horizontal_force, i, ProblemParameters::Impose_position_of_centre, WarpedLine::lift_off_amplitude(), ProblemParameters::Nu, oomph::oomph_info, oomph::CommandLineArgs::parse_and_assign(), ProblemParameters::Penetrator_pt, problem, ProblemParameters::Radius, WarpedLine::radius(), Flag_definition::setup(), oomph::CommandLineArgs::specify_command_line_flag(), ProblemParameters::Weight, WarpedLine::y_c(), and ProblemParameters::Y_c.