<OpenGeoSysProject>
  <meshes>
    <mesh>mesh_1d.vtu</mesh>
    <mesh>left.vtu</mesh>
    <mesh>right.vtu</mesh>
  </meshes>
  <python_script>python_bc.py</python_script>
  <processes>
    <process>
      <name>HC</name>
      <type>HEAT_CONDUCTION</type>
      <integration_order>2</integration_order>
      <process_variables>
        <process_variable>temperature</process_variable>
      </process_variables>
    </process>
  </processes>
  <media>
    <medium id="0">
      <phases />
      <properties>
        <property>
          <name>thermal_conductivity</name>
          <type>Constant</type>
          <value>1.0</value>
        </property>
        <property>
          <name>density</name>
          <type>Constant</type>
          <value>1.0</value>
        </property>
        <property>
          <name>specific_heat_capacity</name>
          <type>Constant</type>
          <value>1.0</value>
        </property>
        <property>
          <name>reference_temperature</name>
          <type>Constant</type>
          <value>0.0</value>
        </property>
      </properties>
    </medium>
  </media>
  <time_loop>
    <processes>
      <process ref="HC">
        <nonlinear_solver>picard</nonlinear_solver>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>NORM2</norm_type>
          <abstol>1e-10</abstol>
        </convergence_criterion>
        <time_discretization>
          <type>BackwardEuler</type>
        </time_discretization>
        <time_stepping>
          <type>SingleStep</type>
        </time_stepping>
      </process>
    </processes>
    <output>
      <type>VTK</type>
      <prefix>out</prefix>
      <variables>
        <variable>temperature</variable>
      </variables>
    </output>
  </time_loop>
  <parameters>
    <parameter>
      <name>T_left</name>
      <type>Constant</type>
      <value>0</value>
    </parameter>
  </parameters>
  <process_variables>
    <process_variable>
      <name>temperature</name>
      <components>1</components>
      <order>1</order>
      <initial_condition>T_left</initial_condition>
      <boundary_conditions>
        <boundary_condition>
          <mesh>left</mesh>
          <type>Dirichlet</type>
          <parameter>T_left</parameter>
        </boundary_condition>
        <boundary_condition>
          <mesh>right</mesh>
          <type>Python</type>
          <bc_object>nonlinear_robin_bc</bc_object>
        </boundary_condition>
      </boundary_conditions>
    </process_variable>
  </process_variables>
  <nonlinear_solvers>
    <nonlinear_solver>
      <name>picard</name>
      <type>Picard</type>
      <max_iter>200</max_iter>
      <linear_solver>ls1</linear_solver>
    </nonlinear_solver>
  </nonlinear_solvers>
  <linear_solvers>
    <linear_solver>
      <name>ls1</name>
      <eigen>
        <solver_type>CG</solver_type>
        <precon_type>DIAGONAL</precon_type>
        <max_iteration_step>10000</max_iteration_step>
        <error_tolerance>1e-14</error_tolerance>
      </eigen>
    </linear_solver>
  </linear_solvers>
  <test_definition>
    <vtkdiff>
      <file>out_ts_1_t_1.000000.vtu</file>
      <field>temperature</field>
      <absolute_tolerance>1e-12</absolute_tolerance>
      <relative_tolerance>0</relative_tolerance>
    </vtkdiff>
  </test_definition>
</OpenGeoSysProject>