<OpenGeoSysProject>
  <meshes>
    <mesh axially_symmetric="true">model.vtu</mesh>
    <mesh axially_symmetric="true">geometry_left.vtu</mesh>
    <mesh axially_symmetric="true">geometry_right.vtu</mesh>
    <mesh axially_symmetric="true">geometry_top.vtu</mesh>
    <mesh axially_symmetric="true">geometry_bottom.vtu</mesh>
  </meshes>
  <processes>
    <process>
      <name>SD</name>
      <type>SMALL_DEFORMATION</type>
      <integration_order>2</integration_order>
      <constitutive_relation>
        <type>MFront</type>
        <behaviour>GuentherSalzerDilatancy_semi_expl</behaviour>
        <material_properties>
          <material_property name="YoungModulus" parameter="YoungModulus" />
          <material_property name="PoissonRatio" parameter="PoissonRatio" />
        </material_properties>
      </constitutive_relation>
      <specific_body_force>0 0</specific_body_force>
      <process_variables>
        <process_variable>displacement</process_variable>
      </process_variables>
      <secondary_variables>
        <secondary_variable name="sigma" />
        <secondary_variable name="epsilon" />
        <secondary_variable name="ElasticStrain" />
        <secondary_variable name="HardeningStrain" />
        <secondary_variable name="DilatancyStrain" />
        <secondary_variable name="DilatancyWork" />
      </secondary_variables>
      <reference_temperature>T_ref</reference_temperature>
      <initial_stress>sig0</initial_stress>
    </process>
  </processes>
  <time_loop>
    <processes>
      <process ref="SD">
        <nonlinear_solver>basic_newton</nonlinear_solver>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>NORM2</norm_type>
          <abstol>1e-8</abstol>
        </convergence_criterion>
        <time_discretization>
          <type>BackwardEuler</type>
        </time_discretization>
        <time_stepping>
          <type>IterationNumberBasedTimeStepping</type>
          <t_initial>0</t_initial>
          <t_end>0.34</t_end>
          <initial_dt>1e-2</initial_dt>
          <minimum_dt>1.e-6</minimum_dt>
          <maximum_dt>1.e-2</maximum_dt>
          <number_iterations>1 5 10 15</number_iterations>
          <multiplier>1.2 1.05 0.8 0.6</multiplier>
        </time_stepping>
      </process>
    </processes>
    <output>
      <type>VTK</type>
      <prefix>triaxial_test_output</prefix>
      <suffix>t{:time}</suffix>
      <timesteps>
        <pair>
          <repeat>10000</repeat>
          <each_steps>100</each_steps>
        </pair>
      </timesteps>
      <variables>
        <variable>displacement</variable>
        <variable>sigma</variable>
        <variable>epsilon</variable>
      </variables>
    </output>
  </time_loop>
  <media>
    <medium>
      <phases>
        <phase>
          <type>Solid</type>
          <properties>
            <property>
              <name>density</name>
              <type>Constant</type>
              <value>0</value>
            </property>
          </properties>
        </phase>
      </phases>
    </medium>
  </media>
  <parameters>
    <parameter>
      <name>sig0</name>
      <type>Function</type>
      <expression>-1</expression>
      <expression>-1</expression>
      <expression>-1</expression>
      <expression>0</expression>
    </parameter>
    <parameter>
      <name>YoungModulus</name>
      <type>Constant</type>
      <value>25e4</value>
    </parameter>
    <parameter>
      <name>PoissonRatio</name>
      <type>Constant</type>
      <value>0.27</value>
    </parameter>
    <parameter>
      <name>T_ref</name>
      <type>Constant</type>
      <value>293.15</value>
    </parameter>
    <parameter>
      <name>displacement0</name>
      <type>Constant</type>
      <values>0 0</values>
    </parameter>
    <parameter>
      <name>zero</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>sig_conf</name>
      <type>Constant</type>
      <value>-1.0</value>
    </parameter>
    <parameter>
      <name>axial_compression</name>
      <type>CurveScaled</type>
      <curve>ax_loading_curve</curve>
      <parameter>disp_top</parameter>
    </parameter>
    <parameter>
      <name>disp_top</name>
      <type>Constant</type>
      <value>-1</value>
    </parameter>
  </parameters>
  <curves>
    <curve>
      <name>ax_loading_curve</name>
      <coords>0.0 0.34</coords>
      <values>0.0 20.0</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>geometry_left</mesh>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>zero</parameter>
        </boundary_condition>
        <boundary_condition>
          <mesh>geometry_bottom</mesh>
          <type>Dirichlet</type>
          <component>1</component>
          <parameter>zero</parameter>
        </boundary_condition>
        <boundary_condition>
          <mesh>geometry_top</mesh>
          <type>Dirichlet</type>
          <component>1</component>
          <parameter>axial_compression</parameter>
        </boundary_condition>
        <boundary_condition>
          <mesh>geometry_right</mesh>
          <type>Neumann</type>
          <component>0</component>
          <parameter>sig_conf</parameter>
        </boundary_condition>
      </boundary_conditions>
    </process_variable>
  </process_variables>
  <nonlinear_solvers>
    <nonlinear_solver>
      <name>basic_newton</name>
      <type>Newton</type>
      <max_iter>60</max_iter>
      <linear_solver>general_linear_solver</linear_solver>
    </nonlinear_solver>
  </nonlinear_solvers>
  <linear_solvers>
    <linear_solver>
      <name>general_linear_solver</name>
      <eigen>
        <solver_type>SparseLU</solver_type>
        <scaling>true</scaling>
      </eigen>
    </linear_solver>
  </linear_solvers>
  <test_definition>
    <vtkdiff>
      <file>triaxial_test_output_t_0.340000.vtu</file>
      <field>displacement</field>
      <absolute_tolerance>3e-8</absolute_tolerance>
      <relative_tolerance>0</relative_tolerance>
    </vtkdiff>
    <vtkdiff>
      <file>triaxial_test_output_t_0.340000.vtu</file>
      <field>sigma</field>
      <absolute_tolerance>9e-2</absolute_tolerance>
      <relative_tolerance>0</relative_tolerance>
    </vtkdiff>
  </test_definition>
</OpenGeoSysProject>