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OGS
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<OpenGeoSysProject>
<meshes>
<mesh>domain.vtu</mesh>
<mesh>inner_boundary.vtu</mesh>
<mesh>left.vtu</mesh>
<mesh>right.vtu</mesh>
<mesh>top.vtu</mesh>
<mesh>bottom.vtu</mesh>
</meshes>
<processes>
<process>
<name>P</name>
<type>SMALL_DEFORMATION</type>
<integration_order>2</integration_order>
<constitutive_relation>
<type>LinearElasticIsotropic</type>
<youngs_modulus>E</youngs_modulus>
<poissons_ratio>nu</poissons_ratio>
</constitutive_relation>
<specific_body_force>0 0</specific_body_force>
<process_variables>
<process_variable>displacement</process_variable>
</process_variables>
<secondary_variables>
<secondary_variable internal_name="sigma" output_name="sigma" />
<secondary_variable internal_name="epsilon" output_name="epsilon" />
</secondary_variables>
<initial_stress>sigma0</initial_stress>
</process>
</processes>
<process_variables>
<process_variable>
<name>displacement</name>
<components>2</components>
<order>1</order>
<initial_condition>u0</initial_condition>
<boundary_conditions>
<boundary_condition>
<mesh>left</mesh>
<type>Dirichlet</type>
<component>0</component>
<parameter>zero</parameter>
</boundary_condition>
<boundary_condition>
<mesh>right</mesh>
<type>Dirichlet</type>
<component>0</component>
<parameter>zero</parameter>
</boundary_condition>
<boundary_condition>
<mesh>top</mesh>
<type>Dirichlet</type>
<component>1</component>
<parameter>zero</parameter>
</boundary_condition>
<boundary_condition>
<mesh>bottom</mesh>
<type>Dirichlet</type>
<component>1</component>
<parameter>zero</parameter>
</boundary_condition>
<boundary_condition>
<mesh>inner_boundary</mesh>
<type>NormalTraction</type>
<parameter>pressure</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
</process_variables>
<parameters>
<parameter>
<name>u0</name>
<type>Constant</type>
<values>0 0</values>
</parameter>
<parameter>
<name>sigma0</name>
<type>Function</type>
<expression>-5e6</expression>
<expression>-5e6</expression>
<expression>-5e6</expression>
<expression>0</expression>
</parameter>
<parameter>
<name>zero</name>
<type>Constant</type>
<value>0</value>
</parameter>
<parameter>
<name>pressure</name>
<type>Constant</type>
<value>-5e6</value>
</parameter>
<parameter>
<name>E</name>
<type>Constant</type>
<value>11.20e+9</value>
</parameter>
<parameter>
<name>nu</name>
<type>Constant</type>
<value>0.37</value>
</parameter>
</parameters>
<media>
<medium>
<phases>
<phase>
<type>Solid</type>
<properties>
<property>
<name>density</name>
<type>Constant</type>
<value>2.52e+3</value>
</property>
</properties>
</phase>
</phases>
</medium>
</media>
<time_loop>
<processes>
<process ref="P">
<nonlinear_solver>basic_newton</nonlinear_solver>
<convergence_criterion>
<type>DeltaX</type>
<norm_type>NORM2</norm_type>
<abstol>1e-10</abstol>
<reltol>1e-8</reltol>
</convergence_criterion>
<time_discretization>
<type>BackwardEuler</type>
</time_discretization>
<time_stepping>
<type>FixedTimeStepping</type>
<t_initial>0</t_initial>
<t_end>1</t_end>
<timesteps>
<pair>
<repeat>1</repeat>
<delta_t>1</delta_t>
</pair>
</timesteps>
</time_stepping>
</process>
</processes>
<output>
<type>VTK</type>
<prefix>normal_traction</prefix>
<timesteps>
<pair>
<repeat>1</repeat>
<each_steps>1</each_steps>
</pair>
</timesteps>
<variables />
</output>
</time_loop>
<nonlinear_solvers>
<nonlinear_solver>
<name>basic_newton</name>
<type>Newton</type>
<max_iter>3</max_iter>
<linear_solver>general_linear_solver</linear_solver>
</nonlinear_solver>
</nonlinear_solvers>
<linear_solvers>
<linear_solver>
<name>general_linear_solver</name>
<eigen>
<solver_type>SparseLU</solver_type>
</eigen>
</linear_solver>
</linear_solvers>
<test_definition>
<vtkdiff>
<file>normal_traction_ts_1_t_1.000000.vtu</file>
<field>displacement</field>
<absolute_tolerance>1e-16</absolute_tolerance>
<relative_tolerance>1e-16</relative_tolerance>
</vtkdiff>
<vtkdiff>
<file>normal_traction_ts_1_t_1.000000.vtu</file>
<field>epsilon</field>
<absolute_tolerance>1e-16</absolute_tolerance>
<relative_tolerance>1e-16</relative_tolerance>
</vtkdiff>
<vtkdiff>
<file>normal_traction_ts_1_t_1.000000.vtu</file>
<field>sigma</field>
<absolute_tolerance>1e-7</absolute_tolerance>
<relative_tolerance>0</relative_tolerance>
</vtkdiff>
</test_definition>
</OpenGeoSysProject>