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OGS
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OGS
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<OpenGeoSysProject>
<mesh axially_symmetric="true">SimpleAxisymmetricCreep.vtu</mesh>
<geometry>boundary.gml</geometry>
<processes>
<process>
<name>ThermoMechanics</name>
<type>THERMO_MECHANICS</type>
<integration_order>2</integration_order>
<constitutive_relation>
<type>CreepBGRa</type>
<youngs_modulus>E</youngs_modulus>
<poissons_ratio>nu</poissons_ratio>
<a>A</a>
<n>n</n>
<sigma0>sigma_f</sigma0>
<q>Q</q>
<nonlinear_solver>
<maximum_iterations>1000</maximum_iterations>
<residuum_tolerance>1e-15</residuum_tolerance>
<increment_tolerance>0</increment_tolerance>
</nonlinear_solver>
</constitutive_relation>
<process_variables>
<displacement>displacement</displacement>
<temperature>temperature</temperature>
</process_variables>
<secondary_variables>
<secondary_variable internal_name="sigma" output_name="sigma" />
<secondary_variable internal_name="epsilon" output_name="epsilon" />
</secondary_variables>
<specific_body_force>0 0</specific_body_force>
</process>
</processes>
<media>
<medium>
<phases>
<phase>
<type>Solid</type>
<properties>
<property>
<name>thermal_conductivity</name>
<type>Constant</type>
<value>100</value>
</property>
<property>
<name>density</name>
<type>Constant</type>
<value>0.</value>
</property>
<property>
<name>thermal_expansivity</name>
<type>Constant</type>
<value>4e-5</value>
</property>
<property>
<name>specific_heat_capacity</name>
<type>Constant</type>
<value>0</value>
</property>
</properties>
</phase>
</phases>
</medium>
</media>
<time_loop>
<processes>
<process ref="ThermoMechanics">
<nonlinear_solver>basic_newton</nonlinear_solver>
<convergence_criterion>
<type>PerComponentDeltaX</type>
<norm_type>NORM2</norm_type>
<abstols>5e-12 1e-16 1e-16</abstols>
</convergence_criterion>
<time_discretization>
<type>BackwardEuler</type>
</time_discretization>
<time_stepping>
<type>FixedTimeStepping</type>
<t_initial>0</t_initial>
<t_end>360</t_end>
<timesteps>
<pair>
<repeat>1</repeat>
<delta_t>1.e-4</delta_t>
</pair>
<pair>
<repeat>10</repeat>
<delta_t>0.1</delta_t>
</pair>
<pair>
<repeat>359</repeat>
<delta_t>1.</delta_t>
</pair>
</timesteps>
</time_stepping>
</process>
</processes>
<output>
<type>VTK</type>
<prefix>SimpleAxisymmetricCreep</prefix>
<timesteps>
<pair>
<repeat>1</repeat>
<each_steps>1</each_steps>
</pair>
<pair>
<repeat>1</repeat>
<each_steps>360</each_steps>
</pair>
</timesteps>
<variables>
<variable>displacement</variable>
<variable>temperature</variable>
<variable>sigma</variable>
<variable>epsilon</variable>
</variables>
<suffix>ts{:timestep}_t_{:time}</suffix>
</output>
</time_loop>
<parameters>
<parameter>
<name>A</name>
<type>Constant</type>
<value>0.18</value>
</parameter>
<parameter>
<name>n</name>
<type>Constant</type>
<value>5.0</value>
</parameter>
<parameter>
<name>sigma_f</name>
<type>Constant</type>
<value>1</value>
</parameter>
<parameter>
<name>Q</name>
<type>Constant</type>
<value>54000</value>
</parameter>
<parameter>
<name>E</name>
<type>Constant</type>
<value>25000</value>
</parameter>
<parameter>
<name>nu</name>
<type>Constant</type>
<value>0.27</value>
</parameter>
<parameter>
<name>temperature_ic</name>
<type>Constant</type>
<value>330.15</value>
</parameter>
<parameter>
<name>temperature_bc</name>
<type>Constant</type>
<value>323.15</value>
</parameter>
<parameter>
<name>displacement0</name>
<type>Constant</type>
<values>0 0</values>
</parameter>
<parameter>
<name>p_bc</name>
<type>Constant</type>
<value>0.</value>
</parameter>
</parameters>
<process_variables>
<process_variable>
<name>displacement</name>
<components>2</components>
<order>1</order>
<initial_condition>displacement0</initial_condition>
<boundary_conditions>
<boundary_condition>
<geometrical_set>cpreepBGRA</geometrical_set>
<geometry>top</geometry>
<type>Dirichlet</type>
<component>1</component>
<parameter>p_bc</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>cpreepBGRA</geometrical_set>
<geometry>bottom</geometry>
<type>Dirichlet</type>
<component>1</component>
<parameter>p_bc</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
<process_variable>
<name>temperature</name>
<components>1</components>
<order>1</order>
<initial_condition>temperature_ic</initial_condition>
<boundary_conditions>
<boundary_condition>
<geometrical_set>cpreepBGRA</geometrical_set>
<geometry>top</geometry>
<type>Dirichlet</type>
<parameter>temperature_bc</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>cpreepBGRA</geometrical_set>
<geometry>bottom</geometry>
<type>Dirichlet</type>
<parameter>temperature_bc</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 jacobi -tol 1e-11 -maxiter 10000</lis>
<eigen>
<solver_type>BiCGSTAB</solver_type>
<precon_type>DIAGONAL</precon_type>
<max_iteration_step>10000</max_iteration_step>
<error_tolerance>1e-17</error_tolerance>
</eigen>
</linear_solver>
</linear_solvers>
</OpenGeoSysProject>
1.12.0