<OpenGeoSysProject>
  <meshes>
    <mesh>shear.vtu</mesh>
    <mesh>shear_bottom.vtu</mesh>
    <mesh>shear_top.vtu</mesh>
    <mesh>shear_left.vtu</mesh>
    <mesh>shear_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>AT2</phasefield_model>
      <energy_split_model>OrthoVolDev</energy_split_model>
      <irreversible_threshold>0.05</irreversible_threshold>
      <constitutive_relation>
        <type>LinearElasticOrthotropic</type>
        <youngs_moduli>E</youngs_moduli>
        <poissons_ratios>nu</poissons_ratios>
        <shear_moduli>G</shear_moduli>
      </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="sigma_tensile" output_name="sigma_tensile" type="static" />
        <secondary_variable internal_name="epsilon" output_name="epsilon" type="static" />
        <secondary_variable internal_name="eps_tensile" output_name="eps_tensile" type="static" />
        <secondary_variable internal_name="sigma_compressive" output_name="sigma_compressive" type="static" />
      </secondary_variables>
      <specific_body_force>0 0</specific_body_force>
    </process>
  </processes>
  <time_loop>
    <global_process_coupling>
      <max_iter>10000</max_iter>
      <convergence_criteria>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>NORM2</norm_type>
          <abstol>1.e-1</abstol>
          <reltol>1.e-1</reltol>
        </convergence_criterion>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>INFINITY_N</norm_type>
          <abstol>1.e-4</abstol>
          <reltol>1.e-10</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-12</reltol>
        </convergence_criterion>
        <time_discretization>
          <type>BackwardEuler</type>
        </time_discretization>
        <time_stepping>
          <type>FixedTimeStepping</type>
          <t_initial>0</t_initial>
          <t_end>1.0</t_end>
          <timesteps>
            <pair>
              <repeat>10</repeat>
              <delta_t>0.01</delta_t>
            </pair>
            <pair>
              <repeat>1</repeat>
              <delta_t>0.0001</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>1.0</t_end>
          <timesteps>
            <pair>
              <repeat>10</repeat>
              <delta_t>0.01</delta_t>
            </pair>
            <pair>
              <repeat>1</repeat>
              <delta_t>0.0001</delta_t>
            </pair>
          </timesteps>
        </time_stepping>
      </process>
    </processes>
    <output>
      <variables>
        <variable>displacement</variable>
        <variable>phasefield</variable>
        <variable>sigma</variable>
        <variable>sigma_tensile</variable>
        <variable>epsilon</variable>
        <variable>epsilon_tensile</variable>
        <variable>NodalForces</variable>
        <variable>bulk_node_ids</variable>
        <variable>bulk_element_ids</variable>
      </variables>
      <type>VTK</type>
      <prefix>shear_deg_0</prefix>
      <timesteps>
        <pair>
          <repeat>100</repeat>
          <each_steps>1</each_steps>
        </pair>
        <pair>
          <repeat>10</repeat>
          <each_steps>1</each_steps>
        </pair>
      </timesteps>
    </output>
  </time_loop>
  <local_coordinate_system>
    <basis_vector_0>e0</basis_vector_0>
    <basis_vector_1>e1</basis_vector_1>
  </local_coordinate_system>
  <parameters>
    <parameter>
      <name>E</name>
      <type>Constant</type>
      <values>6.0e9 13.8e9 13.8e9</values>
    </parameter>
    <parameter>
      <name>nu</name>
      <type>Constant</type>
      <values>0.22 0.44 0.22</values>
    </parameter>
    <parameter>
      <name>G</name>
      <type>Constant</type>
      <values>3.2e9 1.6e9 3.2e9</values>
    </parameter>
    <parameter>
      <name>gc</name>
      <type>Constant</type>
      <value>0.5</value>
    </parameter>
    <parameter>
      <name>e0</name>
      <type>Constant</type>
      <values>1.0 0.0</values>
    </parameter>
    <parameter>
      <name>e1</name>
      <type>Constant</type>
      <values>0.0 1.0</values>
    </parameter>
    <parameter>
      <name>k</name>
      <type>Constant</type>
      <value>1e-8</value>
    </parameter>
    <parameter>
      <name>ls</name>
      <type>Constant</type>
      <value>1.e-4</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</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_top</name>
      <type>Constant</type>
      <value>1.0e-6</value>
    </parameter>
    <parameter>
      <name>dirichlet_bottom</name>
      <type>Constant</type>
      <value>-1.0e-6</value>
    </parameter>
    <parameter>
      <name>dirichlet_top_time</name>
      <type>CurveScaled</type>
      <curve>dirichlet_time</curve>
      <parameter>dirichlet_top</parameter>
    </parameter>
    <parameter>
      <name>dirichlet_bottom_time</name>
      <type>CurveScaled</type>
      <curve>dirichlet_time</curve>
      <parameter>dirichlet_bottom</parameter>
    </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>displacement</name>
      <components>2</components>
      <order>1</order>
      <initial_condition>displacement0</initial_condition>
      <boundary_conditions>
        <boundary_condition>
          <mesh>shear_bottom</mesh>
          <type>Dirichlet</type>
          <component>1</component>
          <parameter>dirichlet0</parameter>
        </boundary_condition>
        <boundary_condition>
          <mesh>shear_bottom</mesh>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>dirichlet0</parameter>
        </boundary_condition>
        <boundary_condition>
          <mesh>shear_top</mesh>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>dirichlet_top_time</parameter>
        </boundary_condition>
        <boundary_condition>
          <mesh>shear_top</mesh>
          <type>Dirichlet</type>
          <component>1</component>
          <parameter>dirichlet0</parameter>
        </boundary_condition>
      </boundary_conditions>
    </process_variable>
    <process_variable>
      <name>phasefield</name>
      <components>1</components>
      <order>1</order>
      <initial_condition>phasefield_ic</initial_condition>
      <boundary_conditions>
        <boundary_condition>
          <mesh>shear_top</mesh>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>phasefield_bc</parameter>
        </boundary_condition>
        <boundary_condition>
          <mesh>shear_bottom</mesh>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>phasefield_bc</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>
      <eigen>
        <solver_type>BiCGSTAB</solver_type>
        <precon_type>ILUT</precon_type>
        <max_iteration_step>10000</max_iteration_step>
        <error_tolerance>1e-16</error_tolerance>
      </eigen>
      <petsc>
        <parameters>-ksp_type cg -pc_type bjacobi -ksp_atol 1e-10 -ksp_rtol 1e-8 -snes_type vinewtonrsls -snes_linesearch_type l2 -snes_atol 1.e-6 -snes_rtol 1.e-6 -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 hypre -u_pc_hypre_type boomeramg -u_pc_hypre_boomeramg_strong_threshold 0.7 -u_ksp_atol 1e-16 -u_ksp_rtol 1e-6</parameters>
      </petsc>
    </linear_solver>
  </linear_solvers>
</OpenGeoSysProject>