 <OpenGeoSysProject>

   <meshes>

     <mesh>mesh_domain.vtu</mesh>

     <mesh>mesh_production.vtu</mesh>

     <mesh>mesh_injection.vtu</mesh>

     <mesh>mesh_top.vtu</mesh>

     <mesh>mesh_bottom.vtu</mesh>

     <mesh>mesh_left.vtu</mesh>

     <mesh>mesh_right.vtu</mesh>

   </meshes>

   <python_script>python_boundary_staggered.py</python_script>

   <processes>

     <process>

       <name>InjectionProduction1D</name>

       <type>HYDRO_MECHANICS</type>

       <coupling_scheme>

         <type>staggered</type>

       </coupling_scheme>

       <integration_order>3</integration_order>

       <constitutive_relation>

         <type>LinearElasticIsotropic</type>

         <youngs_modulus>E</youngs_modulus>

         <poissons_ratio>nu</poissons_ratio>

       </constitutive_relation>

       <process_variables>

         <pressure>pressure</pressure>

         <displacement>displacement</displacement>

       </process_variables>

       <secondary_variables>

         <secondary_variable internal_name="sigma" output_name="sigma" />

         <secondary_variable internal_name="epsilon" output_name="epsilon" />

         <secondary_variable internal_name="velocity" output_name="velocity" />

       </secondary_variables>

       <specific_body_force>0 0</specific_body_force>

     </process>

   </processes>

   <media>

     <medium>

       <phases>

         <phase>

           <type>Gas</type>

           <properties>

             <property>

               <name>viscosity</name>

               <type>Constant</type>

               <value>1.0e-3</value>

             </property>

             <property>

               <name>density</name>

               <type>Linear</type>

               <reference_value>1.0e3</reference_value>

               <independent_variable>

                 <variable_name>gas_phase_pressure</variable_name>

                 <reference_condition>2.125e6</reference_condition>

                 <slope>2.75e-8</slope>

               </independent_variable>

             </property>

           </properties>

         </phase>

         <phase>

           <type>Solid</type>

           <properties>

             <property>

               <name>density</name>

               <type>Constant</type>

               <value>3.0e3</value>

             </property>

           </properties>

         </phase>

       </phases>

       <properties>

         <property>

           <name>porosity</name>

           <type>Constant</type>

           <value>0.3</value>

         </property>

         <property>

           <name>biot_coefficient</name>

           <type>Constant</type>

           <value>1.0</value>

         </property>

         <property>

           <name>reference_temperature</name>

           <type>Constant</type>

           <value>293.15</value>

         </property>

         <property>

           <name>permeability</name>

           <type>Constant</type>

           <value>493.5e-16</value>

         </property>

       </properties>

     </medium>

   </media>

   <time_loop>

     <global_process_coupling>

       <max_iter>100</max_iter>

       <convergence_criteria>

         <convergence_criterion>

           <type>DeltaX</type>

           <norm_type>NORM2</norm_type>

           <abstol>1.e-7</abstol>

         </convergence_criterion>

         <convergence_criterion>

           <type>DeltaX</type>

           <norm_type>NORM2</norm_type>

           <abstol>1.e-14</abstol>

         </convergence_criterion>

       </convergence_criteria>

     </global_process_coupling>

     <processes>

       <process ref="InjectionProduction1D">

         <nonlinear_solver>basic_newton_p</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>FixedTimeStepping</type>

           <t_initial>0</t_initial>

           <t_end>86.4e3</t_end>

           <timesteps>

             <pair>

               <repeat>1</repeat>

               <delta_t>86.4e3</delta_t>

             </pair>

           </timesteps>

         </time_stepping>

       </process>

       <process ref="InjectionProduction1D">

         <nonlinear_solver>basic_newton_u</nonlinear_solver>

         <convergence_criterion>

           <type>PerComponentDeltaX</type>

           <norm_type>NORM2</norm_type>

           <abstols>1e-15 1e-15</abstols>

         </convergence_criterion>

         <time_discretization>

           <type>BackwardEuler</type>

         </time_discretization>

         <time_stepping>

           <type>FixedTimeStepping</type>

           <t_initial>0</t_initial>

           <t_end>86.4e3</t_end>

           <timesteps>

             <pair>

               <repeat>1</repeat>

               <delta_t>86.4e3</delta_t>

             </pair>

           </timesteps>

         </time_stepping>

       </process>

     </processes>

     <output>

       <type>VTK</type>

       <prefix>InjectionProduction1D_Python</prefix>

       <variables>

         <variable>displacement</variable>

         <variable>pressure</variable>

         <variable>sigma</variable>

         <variable>epsilon</variable>

         <variable>velocity</variable>

       </variables>

       <suffix>ts{:timestep}_t_{:time}</suffix>

     </output>

   </time_loop>

   <parameters>

     <parameter>

       <name>E</name>

       <type>Constant</type>

       <value>300.0e6</value>

     </parameter>

     <parameter>

       <name>nu</name>

       <type>Constant</type>

       <value>0.0</value>

     </parameter>

     <parameter>

       <name>zero_vector_2d</name>

       <type>Constant</type>

       <values>0 0</values>

     </parameter>

     <parameter>

       <name>pressure_ic</name>

       <type>Constant</type>

       <values>2.125e6</values>

     </parameter>

   </parameters>

   <process_variables>

     <process_variable>

       <name>pressure</name>

       <components>1</components>

       <order>1</order>

       <initial_condition>pressure_ic</initial_condition>

       <source_terms>

         <source_term>

           <type>Python</type>

           <mesh>mesh_production</mesh>

           <source_term_object>production</source_term_object>

           <flush_stdout>true</flush_stdout>

         </source_term>

         <source_term>

           <type>Python</type>

           <mesh>mesh_injection</mesh>

           <source_term_object>injection</source_term_object>

           <flush_stdout>true</flush_stdout>

         </source_term>

       </source_terms>

     </process_variable>

     <process_variable>

       <name>displacement</name>

       <components>2</components>

       <order>2</order>

       <initial_condition>zero_vector_2d</initial_condition>

       <boundary_conditions>

         <boundary_condition>

           <type>Python</type>

           <mesh>mesh_left</mesh>

           <component>0</component>

           <bc_object>bc_u_D</bc_object>

         </boundary_condition>

         <boundary_condition>

           <type>Python</type>

           <mesh>mesh_right</mesh>

           <component>0</component>

           <bc_object>bc_u_D</bc_object>

         </boundary_condition>

         <boundary_condition>

           <type>Python</type>

           <mesh>mesh_bottom</mesh>

           <component>1</component>

           <bc_object>bc_u_D</bc_object>

         </boundary_condition>

         <boundary_condition>

           <type>Python</type>

           <mesh>mesh_top</mesh>

           <component>1</component>

           <bc_object>bc_u_N</bc_object>

         </boundary_condition>

       </boundary_conditions>

     </process_variable>

   </process_variables>

   <nonlinear_solvers>

     <nonlinear_solver>

       <name>basic_newton_p</name>

       <type>Newton</type>

       <max_iter>100</max_iter>

       <linear_solver>linear_solver_p</linear_solver>

     </nonlinear_solver>

     <nonlinear_solver>

       <name>basic_newton_u</name>

       <type>Newton</type>

       <max_iter>100</max_iter>

       <linear_solver>linear_solver_u</linear_solver>

     </nonlinear_solver>

   </nonlinear_solvers>

   <linear_solvers>

     <linear_solver>

       <name>linear_solver_p</name>

       <eigen>

         <solver_type>SparseLU</solver_type>

         <precon_type>DIAGONAL</precon_type>

       </eigen>

     </linear_solver>

     <linear_solver>

       <name>linear_solver_u</name>

       <eigen>

         <solver_type>SparseLU</solver_type>

         <precon_type>DIAGONAL</precon_type>

       </eigen>

     </linear_solver>

   </linear_solvers>

 </OpenGeoSysProject>