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OGS
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OGS
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<OpenGeoSysProject>
<mesh>two_cracks_junction.vtu</mesh>
<geometry>single_joint.gml</geometry>
<processes>
<process>
<name>SD</name>
<type>SMALL_DEFORMATION_WITH_LIE</type>
<integration_order>2</integration_order>
<process_variables>
<process_variable>displacement</process_variable>
<process_variable>displacement_jump1</process_variable>
<process_variable>displacement_jump2</process_variable>
<process_variable>displacement_jump3</process_variable>
</process_variables>
<constitutive_relation>
<type>LinearElasticIsotropic</type>
<youngs_modulus>E</youngs_modulus>
<poissons_ratio>nu</poissons_ratio>
</constitutive_relation>
<fracture_model>
<type>LinearElasticIsotropic</type>
<normal_stiffness>Kn</normal_stiffness>
<shear_stiffness>Ks</shear_stiffness>
<penalty_aperture_cutoff>1e-5</penalty_aperture_cutoff>
<tension_cutoff>1</tension_cutoff>
</fracture_model>
<fracture_properties>
<material_id>1</material_id>
<initial_aperture>aperture0</initial_aperture>
</fracture_properties>
<fracture_properties>
<material_id>2</material_id>
<initial_aperture>aperture0</initial_aperture>
</fracture_properties>
<secondary_variables>
<secondary_variable internal_name="sigma" output_name="sigma" />
<secondary_variable internal_name="epsilon" output_name="epsilon" />
<secondary_variable internal_name="fracture_stress" output_name="fracture_stress" />
<secondary_variable internal_name="fracture_aperture" output_name="fracture_aperture" />
</secondary_variables>
</process>
</processes>
<time_loop>
<processes>
<process ref="SD">
<nonlinear_solver>basic_newton</nonlinear_solver>
<convergence_criterion>
<type>Residual</type>
<norm_type>NORM2</norm_type>
<abstol>1e-6</abstol>
</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>1.0</delta_t>
</pair>
</timesteps>
</time_stepping>
</process>
</processes>
<output>
<type>VTK</type>
<prefix>two_cracks_junction_pull</prefix>
<timesteps>
<pair>
<repeat>1</repeat>
<each_steps>10000000</each_steps>
</pair>
</timesteps>
<variables>
<variable>displacement</variable>
<variable>displacement_jump1</variable>
<variable>displacement_jump2</variable>
<variable>displacement_jump3</variable>
<variable>sigma</variable>
<variable>epsilon</variable>
<variable>fracture_stress</variable>
<variable>fracture_aperture</variable>
<variable>sigma_avg</variable>
<variable>local_jump_w_avg</variable>
<variable>fracture_stress_avg</variable>
<variable>fracture_aperture_avg</variable>
</variables>
<suffix>ts{:timestep}_t_{:time}</suffix>
</output>
</time_loop>
<parameters>
<parameter>
<name>E</name>
<type>Constant</type>
<value>170e6</value>
</parameter>
<parameter>
<name>nu</name>
<type>Constant</type>
<value>0.22</value>
</parameter>
<parameter>
<name>Kn</name>
<type>Constant</type>
<value>1e12</value>
</parameter>
<parameter>
<name>Ks</name>
<type>Constant</type>
<value>1e9</value>
</parameter>
<parameter>
<name>displacement0</name>
<type>Constant</type>
<values>0 0</values>
</parameter>
<parameter>
<name>aperture0</name>
<type>Constant</type>
<value>1e-5</value>
</parameter>
<parameter>
<name>load</name>
<type>Constant</type>
<value>7e+3</value>
</parameter>
<parameter>
<name>zero_u</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>single_joint</geometrical_set>
<geometry>PLY_BOTTOM</geometry>
<type>Dirichlet</type>
<component>1</component>
<parameter>zero_u</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>single_joint</geometrical_set>
<geometry>POINT0</geometry>
<type>Dirichlet</type>
<component>0</component>
<parameter>zero_u</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>single_joint</geometrical_set>
<geometry>PLY_TOP</geometry>
<type>Neumann</type>
<component>1</component>
<parameter>load</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
<process_variable>
<name>displacement_jump1</name>
<components>2</components>
<order>1</order>
<initial_condition>displacement0</initial_condition>
<boundary_conditions />
</process_variable>
<process_variable>
<name>displacement_jump2</name>
<components>2</components>
<order>1</order>
<initial_condition>displacement0</initial_condition>
<boundary_conditions />
</process_variable>
<process_variable>
<name>displacement_jump3</name>
<components>2</components>
<order>1</order>
<initial_condition>displacement0</initial_condition>
<boundary_conditions />
</process_variable>
</process_variables>
<nonlinear_solvers>
<nonlinear_solver>
<name>basic_newton</name>
<type>Newton</type>
<max_iter>15</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-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>sd</prefix>
<parameters>-sd_ksp_type cg -sd_pc_type bjacobi -sd_ksp_rtol 1e-16 -sd_ksp_max_it 10000</parameters>
</petsc>
</linear_solver>
</linear_solvers>
</OpenGeoSysProject>
1.12.0