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OGS
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OGS
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<OpenGeoSysProject>
<meshes>
<mesh>ParallelPlate.vtu</mesh>
<mesh>ParallelPlate_top.vtu</mesh>
<mesh>ParallelPlate_bottom.vtu</mesh>
<mesh>ParallelPlate_left.vtu</mesh>
<mesh>ParallelPlate_right.vtu</mesh>
</meshes>
<processes>
<process>
<name>ff</name>
<type>StokesFlow</type>
<integration_order>3</integration_order>
<process_variables>
<liquid_velocity>liquid_velocity</liquid_velocity>
<pressure>pressure</pressure>
</process_variables>
<specific_body_force>2 0</specific_body_force>
</process>
</processes>
<media>
<medium id="0">
<phases>
<phase>
<type>AqueousLiquid</type>
<properties>
<property>
<name>viscosity</name>
<type>Constant</type>
<value>5e-3</value>
</property>
</properties>
</phase>
</phases>
</medium>
</media>
<time_loop>
<processes>
<process ref="ff">
<nonlinear_solver>basic_picard</nonlinear_solver>
<convergence_criterion>
<type>PerComponentDeltaX</type>
<norm_type>NORM2</norm_type>
<abstols>1.e-6 1.e-6 1.e-6</abstols>
</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>ParallelPlateWithBodyForce</prefix>
<suffix>ts{:timestep}_t_{:time}</suffix>
<timesteps>
<pair>
<repeat>2</repeat>
<each_steps>1</each_steps>
</pair>
</timesteps>
<variables>
<variable>liquid_velocity</variable>
<variable>pressure</variable>
<variable>pressure_interpolated</variable>
</variables>
</output>
</time_loop>
<parameters>
<parameter>
<name>kappa</name>
<type>Constant</type>
<values>1.157e-12</values>
</parameter>
<parameter>
<name>porosity</name>
<type>Constant</type>
<value>1</value>
</parameter>
<parameter>
<name>decay</name>
<type>Constant</type>
<value>0</value>
</parameter>
<parameter>
<name>Dirichlet0</name>
<type>Constant</type>
<value>0</value>
</parameter>
<parameter>
<name>v0</name>
<type>Constant</type>
<values>0 0</values>
</parameter>
<parameter>
<name>p0</name>
<type>Constant</type>
<value>200000</value>
</parameter>
<parameter>
<name>p_in</name>
<type>Constant</type>
<value>200039.8</value>
</parameter>
<parameter>
<name>p_out</name>
<type>Constant</type>
<value>200000</value>
</parameter>
</parameters>
<process_variables>
<process_variable>
<name>liquid_velocity</name>
<components>2</components>
<order>2</order>
<initial_condition>v0</initial_condition>
<boundary_conditions>
<boundary_condition>
<mesh>ParallelPlate_top</mesh>
<type>Dirichlet</type>
<component>0</component>
<parameter>Dirichlet0</parameter>
</boundary_condition>
<boundary_condition>
<mesh>ParallelPlate_bottom</mesh>
<type>Dirichlet</type>
<component>0</component>
<parameter>Dirichlet0</parameter>
</boundary_condition>
<boundary_condition>
<mesh>ParallelPlate_top</mesh>
<type>Dirichlet</type>
<component>1</component>
<parameter>Dirichlet0</parameter>
</boundary_condition>
<boundary_condition>
<mesh>ParallelPlate_bottom</mesh>
<type>Dirichlet</type>
<component>1</component>
<parameter>Dirichlet0</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
<process_variable>
<name>pressure</name>
<components>1</components>
<order>1</order>
<initial_condition>p0</initial_condition>
<boundary_conditions>
<boundary_condition>
<mesh>ParallelPlate_left</mesh>
<type>Dirichlet</type>
<parameter>p_in</parameter>
</boundary_condition>
<boundary_condition>
<mesh>ParallelPlate_right</mesh>
<type>Dirichlet</type>
<parameter>p_out</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
</process_variables>
<nonlinear_solvers>
<nonlinear_solver>
<name>basic_picard</name>
<type>Picard</type>
<max_iter>300</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-16 -maxiter 20000</lis>
<eigen>
<solver_type>BiCGSTAB</solver_type>
<precon_type>ILUT</precon_type>
<max_iteration_step>10000</max_iteration_step>
<error_tolerance>1e-14</error_tolerance>
</eigen>
<petsc>
<parameters>-ksp_type cg -pc_type bjacobi -ksp_atol 1e-10 -ksp_rtol 1e-8 -snes_type vinewtonssls -snes_linesearch_type l2 -snes_atol 1.e-8 -snes_rtol 1.e-8 -snes_max_it 1000 -snes_monitor</parameters>
</petsc>
</linear_solver>
</linear_solvers>
<test_definition>
<vtkdiff>
<regex>ParallelPlateWithBodyForce_ts_[0-9]*_t_[0-9]*.000000.vtu</regex>
<field>pressure_interpolated</field>
<absolute_tolerance>1e-6</absolute_tolerance>
<relative_tolerance>1e-10</relative_tolerance>
</vtkdiff>
<vtkdiff>
<regex>ParallelPlateWithBodyForce_ts_[0-9]*_t_[0-9]*.000000.vtu</regex>
<field>liquid_velocity</field>
<absolute_tolerance>1e-10</absolute_tolerance>
<relative_tolerance>1e-16</relative_tolerance>
</vtkdiff>
</test_definition>
</OpenGeoSysProject>
1.12.0