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<?xml version="1.0" encoding="ISO-8859-1"?>
<OpenGeoSysProject>
<mesh>square_1x1_quad_1e2.vtu</mesh>
<geometry>square_1x1.gml</geometry>
<processes>
<process>
<name>GW23</name>
<type>GROUNDWATER_FLOW</type>
<integration_order>2</integration_order>
<hydraulic_conductivity>K</hydraulic_conductivity>
<process_variables>
<process_variable>pressure</process_variable>
</process_variables>
<secondary_variables>
<secondary_variable type="static" internal_name="darcy_velocity" output_name="v"/>
</secondary_variables>
</process>
</processes>
<time_loop>
<processes>
<process ref="GW23">
<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>SingleStep</type>
</time_stepping>
</process>
</processes>
<output>
<type>VTK</type>
<prefix>square_1e2</prefix>
<variables>
<variable> pressure </variable>
<variable> v </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-16 -maxiter 10000</lis>
<eigen>
<solver_type>CG</solver_type>
<precon_type>DIAGONAL</precon_type>
<max_iteration_step>10000</max_iteration_step>
<error_tolerance>1e-16</error_tolerance>
</eigen>
<petsc>
<prefix>gw</prefix>
<parameters>-gw_ksp_type cg -gw_pc_type bjacobi -gw_ksp_rtol 1e-16 -gw_ksp_max_it 10000</parameters>
</petsc>
</linear_solver>
</linear_solvers>
<parameters>
<parameter>
<name>K</name>
<type>Constant</type>
<value>1</value>
</parameter>
<parameter>
<name>p0</name>
<type>Constant</type>
<value>0</value>
</parameter>
<parameter>
<name>p_Dirichlet_left</name>
<type>Constant</type>
<value>1</value>
</parameter>
<parameter>
<name>p_Dirichlet_right</name>
<type>Constant</type>
<value>-1</value>
</parameter>
</parameters>
<process_variables>
<process_variable>
<name>pressure</name>
<components>1</components>
<order>1</order>
<initial_condition>p0</initial_condition>
<boundary_conditions>
<boundary_condition>
<geometrical_set>square_1x1_geometry</geometrical_set>
<geometry>left</geometry>
<type>Dirichlet</type>
<parameter>p_Dirichlet_left</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>square_1x1_geometry</geometrical_set>
<geometry>right</geometry>
<type>Dirichlet</type>
<parameter>p_Dirichlet_right</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
</process_variables>
</OpenGeoSysProject>