<OpenGeoSysProject>
  <meshes>
    <mesh>bar.vtu</mesh>
    <mesh>bar_left.vtu</mesh>
    <mesh>bar_right.vtu</mesh>
  </meshes>
  <processes>
    <process>
      <name>PhaseField</name>
      <type>PHASE_FIELD</type>
      <coupling_scheme>staggered</coupling_scheme>
      <integration_order>2</integration_order>
      <phasefield_model>COHESIVE</phasefield_model>
      <softening_curve>Linear</softening_curve>
      <energy_split_model>EffectiveStress</energy_split_model>
      <irreversible_threshold>0.05</irreversible_threshold>
      <characteristic_length>0.4</characteristic_length>
      <constitutive_relation>
        <type>LinearElasticIsotropic</type>
        <youngs_modulus>E</youngs_modulus>
        <poissons_ratio>nu</poissons_ratio>
      </constitutive_relation>
      <phasefield_parameters>
        <residual_stiffness>k</residual_stiffness>
        <crack_resistance>gc</crack_resistance>
        <crack_length_scale>ls</crack_length_scale>
      </phasefield_parameters>
      <solid_density>rho_sr</solid_density>
      <process_variables>
        <phasefield>phasefield</phasefield>
        <displacement>displacement</displacement>
      </process_variables>
      <secondary_variables>
        <secondary_variable internal_name="sigma" output_name="sigma" type="static" />
        <secondary_variable internal_name="epsilon" output_name="epsilon" type="static" />
      </secondary_variables>
      <specific_body_force>0 0 0</specific_body_force>
    </process>
  </processes>
  <time_loop>
    <global_process_coupling>
      <max_iter>1000</max_iter>
      <convergence_criteria>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>INFINITY_N</norm_type>
          <reltol>1.e-8</reltol>
        </convergence_criterion>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>INFINITY_N</norm_type>
          <reltol>1.e-8</reltol>
        </convergence_criterion>
      </convergence_criteria>
    </global_process_coupling>
    <processes>
      <process ref="PhaseField">
        <nonlinear_solver>basic_newton_u</nonlinear_solver>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>NORM2</norm_type>
          <reltol>1.e-14</reltol>
        </convergence_criterion>
        <time_discretization>
          <type>BackwardEuler</type>
        </time_discretization>
        <time_stepping>
          <type>FixedTimeStepping</type>
          <t_initial>0</t_initial>
          <t_end>1.1</t_end>
          <timesteps>
            <pair>
              <repeat>1</repeat>
              <delta_t>1.e-1</delta_t>
            </pair>
          </timesteps>
        </time_stepping>
      </process>
      <process ref="PhaseField">
        <nonlinear_solver>petsc_snes</nonlinear_solver>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>NORM2</norm_type>
          <reltol>1.e-14</reltol>
        </convergence_criterion>
        <time_discretization>
          <type>BackwardEuler</type>
        </time_discretization>
        <time_stepping>
          <type>FixedTimeStepping</type>
          <t_initial>0</t_initial>
          <t_end>1.1</t_end>
          <timesteps>
            <pair>
              <repeat>1</repeat>
              <delta_t>1.e-1</delta_t>
            </pair>
          </timesteps>
        </time_stepping>
      </process>
    </processes>
    <output>
      <variables>
        <variable>displacement</variable>
        <variable>phasefield</variable>
        <variable>sigma</variable>
        <variable>epsilon</variable>
      </variables>
      <type>VTK</type>
      <prefix>bar_COHESIVE_linear</prefix>
      <timesteps>
        <pair>
          <repeat>1</repeat>
          <each_steps>1</each_steps>
        </pair>
        <pair>
          <repeat>1</repeat>
          <each_steps>1</each_steps>
        </pair>
      </timesteps>
    </output>
  </time_loop>
  <parameters>
    <parameter>
      <name>E</name>
      <type>Constant</type>
      <value>3e10</value>
    </parameter>
    <parameter>
      <name>nu</name>
      <type>Constant</type>
      <value>0.2</value>
    </parameter>
    <parameter>
      <name>k</name>
      <type>Constant</type>
      <value>1e-16</value>
    </parameter>
    <parameter>
      <name>gc</name>
      <type>Constant</type>
      <value>120</value>
    </parameter>
    <parameter>
      <name>ls</name>
      <type>Constant</type>
      <value>0.05</value>
    </parameter>
    <parameter>
      <name>rho_sr</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>displacement0</name>
      <type>Constant</type>
      <values>0 0 0</values>
    </parameter>
    <parameter>
      <name>phasefield_ic</name>
      <type>Constant</type>
      <value>1</value>
    </parameter>
    <parameter>
      <name>phasefield_bc</name>
      <type>Constant</type>
      <value>1</value>
    </parameter>
    <parameter>
      <name>dirichlet0</name>
      <type>Constant</type>
      <value>0</value>
    </parameter>
    <parameter>
      <name>dirichlet_right</name>
      <type>CurveScaled</type>
      <curve>dirichlet_time</curve>
      <parameter>dirichlet_load</parameter>
    </parameter>
    <parameter>
      <name>dirichlet_load</name>
      <type>Constant</type>
      <value>1.1e-4</value>
    </parameter>
  </parameters>
  <curves>
    <curve>
      <name>dirichlet_time</name>
      <coords>0 1.0</coords>
      <values>0 1.0</values>
    </curve>
  </curves>
  <process_variables>
    <process_variable>
      <name>phasefield</name>
      <components>1</components>
      <order>1</order>
      <initial_condition>phasefield_ic</initial_condition>
      <boundary_conditions>
        <boundary_condition>
          <geometrical_set>bar</geometrical_set>
          <geometry>left</geometry>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>phasefield_bc</parameter>
        </boundary_condition>
        <boundary_condition>
          <geometrical_set>bar</geometrical_set>
          <geometry>right</geometry>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>phasefield_bc</parameter>
        </boundary_condition>
      </boundary_conditions>
    </process_variable>
    <process_variable>
      <name>displacement</name>
      <components>3</components>
      <order>1</order>
      <initial_condition>displacement0</initial_condition>
      <boundary_conditions>
        <boundary_condition>
          <geometrical_set>bar</geometrical_set>
          <geometry>left</geometry>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>dirichlet0</parameter>
        </boundary_condition>
        <boundary_condition>
          <geometrical_set>bar</geometrical_set>
          <geometry>right</geometry>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>dirichlet_right</parameter>
        </boundary_condition>
      </boundary_conditions>
    </process_variable>
  </process_variables>
  <nonlinear_solvers>
    <nonlinear_solver>
      <name>petsc_snes</name>
      <type>PETScSNES</type>
      <max_iter>50</max_iter>
      <linear_solver>linear_solver_d</linear_solver>
    </nonlinear_solver>
    <nonlinear_solver>
      <name>basic_newton_u</name>
      <type>Newton</type>
      <max_iter>200</max_iter>
      <linear_solver>linear_solver_u</linear_solver>
    </nonlinear_solver>
  </nonlinear_solvers>
  <linear_solvers>
    <linear_solver>
      <name>linear_solver_d</name>
      <petsc>
        <parameters>-ksp_type cg -pc_type bjacobi -ksp_atol 1e-14 -ksp_rtol 1e-14 -snes_type vinewtonrsls -snes_linesearch_type l2 -snes_atol 1.e-14 -snes_rtol 1.e-14 -snes_max_it 1000 -snes_monitor</parameters>
      </petsc>
    </linear_solver>
    <linear_solver>
      <name>linear_solver_u</name>
      <petsc>
        <prefix>u</prefix>
        <parameters>-u_ksp_type cg -u_pc_type bjacobi -u_ksp_atol 1e-14 -u_ksp_rtol 1e-14</parameters>
      </petsc>
    </linear_solver>
  </linear_solvers>
  <test_definition>
    <vtkdiff>
      <file>bar_COHESIVE_linear_ts_11_t_1.100000.vtu</file>
      <field>displacement</field>
      <absolute_tolerance>2e-12</absolute_tolerance>
      <relative_tolerance>0</relative_tolerance>
    </vtkdiff>
    <vtkdiff>
      <file>bar_COHESIVE_linear_ts_11_t_1.100000.vtu</file>
      <field>phasefield</field>
      <absolute_tolerance>1e-8</absolute_tolerance>
      <relative_tolerance>0</relative_tolerance>
    </vtkdiff>
  </test_definition>
</OpenGeoSysProject>