<OpenGeoSysProject>
  <mesh>square_1x1_quad_1e2.vtu</mesh>
  <geometry>square_1x1.gml</geometry>
  <processes>
    <process>
      <name>RF</name>
      <type>RICHARDS_FLOW</type>
      <integration_order>3</integration_order>
      <jacobian_assembler>
        <type>CentralDifferences</type>
        <component_magnitudes>1</component_magnitudes>
        <relative_epsilons>1e-8</relative_epsilons>
      </jacobian_assembler>
      <process_variables>
        <process_variable>pressure</process_variable>
      </process_variables>
      <secondary_variables>
        <secondary_variable internal_name="darcy_velocity" output_name="darcy_velocity" />
        <secondary_variable internal_name="saturation" output_name="saturation" />
      </secondary_variables>
      <specific_body_force>0 0</specific_body_force>
      <mass_lumping>true</mass_lumping>
    </process>
  </processes>
  <media>
    <medium>
      <phases>
        <phase>
          <type>AqueousLiquid</type>
          <properties>
            <property>
              <name>viscosity</name>
              <type>Constant</type>
              <value>1e-9</value>
            </property>
            <property>
              <name>density</name>
              <type>Constant</type>
              <value>1</value>
            </property>
          </properties>
        </phase>
        <phase>
          <type>Solid</type>
          <properties>
            <property>
              <name>density</name>
              <type>Constant</type>
              <value>1</value>
            </property>
          </properties>
        </phase>
      </phases>
      <properties>
        <property>
          <name>porosity</name>
          <type>Constant</type>
          <value>0.8</value>
        </property>
        <property>
          <name>storage</name>
          <type>Constant</type>
          <value>0.2e-100</value>
        </property>
        <property>
          <name>permeability</name>
          <type>Constant</type>
          <value>1e-12</value>
        </property>
        <property>
          <name>saturation</name>
          <type>Constant</type>
          <value>1</value>
        </property>
        <property>
          <name>relative_permeability</name>
          <type>Constant</type>
          <value>1</value>
        </property>
        <property>
          <name>reference_temperature</name>
          <type>Constant</type>
          <value>293.15</value>
        </property>
      </properties>
    </medium>
  </media>
  <time_loop>
    <processes>
      <process ref="RF">
        <nonlinear_solver>basic_newton</nonlinear_solver>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>NORM2</norm_type>
          <abstol>1e-14</abstol>
        </convergence_criterion>
        <time_discretization>
          <type>BackwardEuler</type>
        </time_discretization>
        <time_stepping>
          <type>FixedTimeStepping</type>
          <t_initial>0</t_initial>
          <t_end>2</t_end>
          <timesteps>
            <pair>
              <repeat>2</repeat>
              <delta_t>1</delta_t>
            </pair>
          </timesteps>
        </time_stepping>
      </process>
    </processes>
    <output>
      <type>VTK</type>
      <prefix>flow_fully_saturated</prefix>
      <timesteps>
        <pair>
          <repeat>10000</repeat>
          <each_steps>1</each_steps>
        </pair>
      </timesteps>
      <variables>
        <variable>pressure</variable>
        <variable>darcy_velocity</variable>
        <variable>saturation</variable>
      </variables>
      <suffix>ts{:timestep}_t_{:time}</suffix>
    </output>
  </time_loop>
  <parameters>
    <parameter>
      <name>pressure_ic</name>
      <type>Constant</type>
      <values>0</values>
    </parameter>
    <parameter>
      <name>dirichlet0</name>
      <type>Constant</type>
      <value>0</value>
    </parameter>
    <parameter>
      <name>dirichlet1</name>
      <type>Constant</type>
      <value>1</value>
    </parameter>
  </parameters>
  <process_variables>
    <process_variable>
      <name>pressure</name>
      <components>1</components>
      <order>1</order>
      <initial_condition>pressure_ic</initial_condition>
      <boundary_conditions>
        <boundary_condition>
          <geometrical_set>square_1x1_geometry</geometrical_set>
          <geometry>left</geometry>
          <type>Dirichlet</type>
          <parameter>dirichlet0</parameter>
        </boundary_condition>
        <boundary_condition>
          <geometrical_set>square_1x1_geometry</geometrical_set>
          <geometry>right</geometry>
          <type>Dirichlet</type>
          <parameter>dirichlet1</parameter>
        </boundary_condition>
      </boundary_conditions>
    </process_variable>
  </process_variables>
  <nonlinear_solvers>
    <nonlinear_solver>
      <name>basic_newton</name>
      <type>Newton</type>
      <max_iter>50</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>
      <regex>flow_fully_saturated_ts_.*.vtu</regex>
      <field>pressure</field>
      <absolute_tolerance>1e-9</absolute_tolerance>
      <relative_tolerance>0</relative_tolerance>
    </vtkdiff>
    <vtkdiff>
      <regex>flow_fully_saturated_ts_.*.vtu</regex>
      <field>darcy_velocity</field>
      <absolute_tolerance>1e-11</absolute_tolerance>
      <relative_tolerance>1e-15</relative_tolerance>
    </vtkdiff>
  </test_definition>
</OpenGeoSysProject>