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OGS
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OGS
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<OpenGeoSysProject>
<mesh>Richards_2d.vtu</mesh>
<geometry>Richards_2d.gml</geometry>
<processes>
<process>
<name>GW23</name>
<type>RICHARDS_FLOW</type>
<integration_order>2</integration_order>
<jacobian_assembler>
<type>CentralDifferences</type>
<component_magnitudes>1e4</component_magnitudes>
<relative_epsilons>1e-6</relative_epsilons>
</jacobian_assembler>
<process_variables>
<process_variable>pressure</process_variable>
</process_variables>
<secondary_variables>
<secondary_variable internal_name="saturation" output_name="saturation" />
</secondary_variables>
<specific_body_force>0 -9.81</specific_body_force>
<mass_lumping>true</mass_lumping>
</process>
</processes>
<media>
<medium id="0">
<phases>
<phase>
<type>AqueousLiquid</type>
<properties>
<property>
<name>viscosity</name>
<type>Constant</type>
<value>1.e-3</value>
</property>
<property>
<name>density</name>
<type>Constant</type>
<value>1.e3</value>
</property>
</properties>
</phase>
</phases>
<properties>
<property>
<name>storage</name>
<type>Constant</type>
<value>0.0</value>
</property>
<property>
<name>porosity</name>
<type>Constant</type>
<value>0.38</value>
</property>
<property>
<name>permeability</name>
<type>Constant</type>
<value>4.46e-13</value>
</property>
<property>
<name>relative_permeability</name>
<type>Curve</type>
<independent_variable>liquid_saturation</independent_variable>
<curve>relative_permeability</curve>
</property>
<property>
<name>saturation</name>
<type>Curve</type>
<independent_variable>capillary_pressure</independent_variable>
<curve>capillary_pressure</curve>
</property>
<property>
<name>reference_temperature</name>
<type>Constant</type>
<value>293.15</value>
</property>
</properties>
</medium>
</media>
<time_loop>
<processes>
<process ref="GW23">
<nonlinear_solver>basic_newton</nonlinear_solver>
<convergence_criterion>
<type>DeltaX</type>
<norm_type>NORM2</norm_type>
<abstol>1e-11</abstol>
</convergence_criterion>
<time_discretization>
<type>BackwardEuler</type>
</time_discretization>
<time_stepping>
<type>FixedTimeStepping</type>
<t_initial>0</t_initial>
<t_end>1600</t_end>
<timesteps>
<pair>
<repeat>500</repeat>
<delta_t>1</delta_t>
</pair>
<pair>
<repeat>500</repeat>
<delta_t>2</delta_t>
</pair>
<pair>
<repeat>500</repeat>
<delta_t>1</delta_t>
</pair>
<pair>
<repeat>1300</repeat>
<delta_t>2</delta_t>
</pair>
<pair>
<repeat>500</repeat>
<delta_t>1</delta_t>
</pair>
</timesteps>
</time_stepping>
</process>
</processes>
<output>
<type>VTK</type>
<prefix>richards</prefix>
<timesteps>
<pair>
<repeat>1</repeat>
<each_steps>100000000</each_steps>
</pair>
</timesteps>
<output_iteration_results>false</output_iteration_results>
<variables>
<variable>pressure</variable>
<variable>saturation</variable>
</variables>
<suffix>ts{:timestep}_t_{:time}</suffix>
</output>
</time_loop>
<parameters>
<parameter>
<name>p0</name>
<type>Constant</type>
<value>-21500.</value>
</parameter>
<parameter>
<name>p_Dirichlet_bottom</name>
<type>Constant</type>
<value>-21500.</value>
</parameter>
<parameter>
<name>p_Dirichlet_top</name>
<type>Constant</type>
<value>0.0</value>
</parameter>
</parameters>
<curves>
<curve>
<name>capillary_pressure</name>
<coords>1421.99634 1707.55369 2050.45507 2462.21599 2892.29884 3232.80969 3590.71602 3988.24638 4429.78757 4920.21206 5464.93174 9238.24221 10261.0136 12658.7874 15616.8683 26399.6732 44627.5611</coords>
<values>1 0.98684211 0.97368421 0.96052632 0.94894737 0.92105263 0.89473684 0.86842105 0.84210526 0.81578947 0.78947368 0.65789474 0.63157895 0.57894737 0.52631579 0.39473684 0.26315789</values>
</curve>
<curve>
<name>relative_permeability</name>
<coords>0.26315789 0.39473684 0.52631579 0.57894737 0.63157895 0.65789474 0.78947368 0.81578947 0.84210526 0.86842105 0.89473684 0.92105263 0.94894737 0.96052632 0.97368421 0.98684211 1</coords>
<values>4.43E-05 0.00026547 0.00159003 0.00325358 0.00665757 0.00952343 0.05704014 0.08159396 0.11671736 0.16696017 0.23883078 0.34163922 0.49931406 0.58449912 0.69907308 0.8361059 1</values>
</curve>
</curves>
<process_variables>
<process_variable>
<name>pressure</name>
<components>1</components>
<order>1</order>
<initial_condition>p0</initial_condition>
<boundary_conditions>
<boundary_condition>
<geometrical_set>Richards_2d_geometry</geometrical_set>
<geometry>BOTTOM</geometry>
<type>Dirichlet</type>
<parameter>p_Dirichlet_bottom</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>Richards_2d_geometry</geometrical_set>
<geometry>TOP</geometry>
<type>Dirichlet</type>
<parameter>p_Dirichlet_top</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>
<lis>-i bicgstab -p ilu -tol 1e-16 -maxiter 5000 -print mem</lis>
<eigen>
<solver_type>BiCGSTAB</solver_type>
<precon_type>ILUT</precon_type>
<max_iteration_step>5000</max_iteration_step>
<error_tolerance>1e-16</error_tolerance>
</eigen>
<petsc>
<prefix>r</prefix>
<parameters>-r_ksp_type bicg -r_pc_type bjacobi -r_ksp_rtol 1e-16 -r_ksp_max_it 10000</parameters>
</petsc>
</linear_solver>
</linear_solvers>
</OpenGeoSysProject>
1.11.0