<OpenGeoSysProject>
  <meshes>
    <mesh>square_5x5_tris_32.vtu</mesh>
    <mesh>square_5x5_tris_32_left_boundary.vtu</mesh>
    <mesh>square_5x5_tris_32_right_boundary.vtu</mesh>
  </meshes>
  <processes>
    <process>
      <name>LiquidFlow</name>
      <type>LIQUID_FLOW</type>
      <integration_order>2</integration_order>
      <process_variables>
        <process_variable>pressure</process_variable>
      </process_variables>
      <secondary_variables>
        <secondary_variable internal_name="darcy_velocity" output_name="v" />
      </secondary_variables>
      <specific_body_force>0.0 0.0</specific_body_force>
    </process>
  </processes>
  <media>
    <medium id="0">
      <phases>
        <phase>
          <type>AqueousLiquid</type>
          <properties>
            <property>
              <name>viscosity</name>
              <type>Constant</type>
              <value>0.0011373</value>
            </property>
            <property>
              <name>density</name>
              <type>Constant</type>
              <value>1000</value>
            </property>
          </properties>
        </phase>
      </phases>
      <properties>
        <property>
          <name>permeability</name>
          <type>Constant</type>
          <value>3.2439e-12</value>
        </property>
        <property>
          <name>reference_temperature</name>
          <type>Constant</type>
          <value>293.15</value>
        </property>
        <property>
          <name>porosity</name>
          <type>Constant</type>
          <value>0.17</value>
        </property>
        <property>
          <name>storage</name>
          <type>Constant</type>
          <value>0.0</value>
        </property>
      </properties>
    </medium>
  </media>
  <parameters>
    <parameter>
      <name>p_0</name>
      <type>Function</type>
      <expression>z</expression>
    </parameter>
    <parameter>
      <name>p_polyline_left</name>
      <type>Function</type>
      <expression>x+1</expression>
    </parameter>
    <parameter>
      <name>p_polyline_right</name>
      <type>Function</type>
      <expression>x-5</expression>
    </parameter>
  </parameters>
  <process_variables>
    <process_variable>
      <name>pressure</name>
      <order>1</order>
      <components>1</components>
      <initial_condition>p_0</initial_condition>
      <boundary_conditions>
        <boundary_condition>
          <type>Dirichlet</type>
          <mesh>square_5x5_tris_32_left_boundary</mesh>
          <parameter>p_polyline_left</parameter>
        </boundary_condition>
        <boundary_condition>
          <type>Dirichlet</type>
          <mesh>square_5x5_tris_32_right_boundary</mesh>
          <parameter>p_polyline_right</parameter>
        </boundary_condition>
      </boundary_conditions>
    </process_variable>
  </process_variables>
  <time_loop>
    <processes>
      <process ref="LiquidFlow">
        <nonlinear_solver>basic_picard</nonlinear_solver>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>NORM2</norm_type>
          <abstol>1.e-6</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>0.3</delta_t>
            </pair>
          </timesteps>
        </time_stepping>
      </process>
    </processes>
    <output>
      <type>XDMF</type>
      <prefix>{:meshname}</prefix>
      <suffix>ts{:timestep}_t_{:time}</suffix>
      <meshes>
        <mesh>square_5x5_tris_32</mesh>
        <mesh>square_5x5_tris_32_left_boundary</mesh>
        <mesh>square_5x5_tris_32_right_boundary</mesh>
      </meshes>
      <timesteps>
        <pair>
          <repeat>1</repeat>
          <each_steps>1</each_steps>
        </pair>
      </timesteps>
      <hdf>
        <chunk_size_bytes>123456</chunk_size_bytes>
        <number_of_files>1</number_of_files>
      </hdf>
      <output_iteration_results>false</output_iteration_results>
      <variables>
        <variable>pressure</variable>
        <variable>v</variable>
        <variable>bulk_node_ids</variable>
        <variable>bulk_element_ids</variable>
        <variable>MaterialIDs</variable>
        <variable>VolumetricFlowRate</variable>
      </variables>
    </output>
  </time_loop>
  <nonlinear_solvers>
    <nonlinear_solver>
      <name>basic_picard</name>
      <type>Picard</type>
      <max_iter>10</max_iter>
      <linear_solver>general_linear_solver</linear_solver>
    </nonlinear_solver>
  </nonlinear_solvers>
  <linear_solvers>
    <linear_solver>
      <name>general_linear_solver</name>
      <lis>-i cg -p jacobi -tol 1e-15 -maxiter 10000</lis>
      <eigen>
        <solver_type>BiCGSTAB</solver_type>
        <precon_type>DIAGONAL</precon_type>
        <max_iteration_step>1000</max_iteration_step>
        <error_tolerance>1e-16</error_tolerance>
      </eigen>
      <petsc>
        <prefix>lf</prefix>
        <parameters>-lf_ksp_type cg -lf_pc_type bjacobi -lf_ksp_rtol 1e-16 -lf_ksp_max_it 10000</parameters>
      </petsc>
    </linear_solver>
  </linear_solvers>
  <test_definition>
    <vtkdiff>
      <regex>square_5x5_tris_32_ts_1_t_1.000000.vtu</regex>
      <field>pressure</field>
      <absolute_tolerance>1e-15</absolute_tolerance>
      <relative_tolerance>1e-14</relative_tolerance>
    </vtkdiff>
  </test_definition>
</OpenGeoSysProject>