Constraint relaxation
Contents
Data Structure: Constraint_relaxation |
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Description |
Defines geometry sets for application of constraint relaxation |
Usage |
Constraint_relaxation NUM=ival where ival is the data structure number |
Description |
Overview If a constraint (displacement, pore pressure, or temperature) is changed from prescribed to free, then by default there is potentially a sudden change in the values at the boundary. Constraint relaxation stores the internal loading prior to removal of the constraint, and then relaxes this loading over a prescribed time, resulting in a gradual change of the boundary values. By default the constraint is relaxed with an sramp (nonlinear curve to linear ramp) function that varies from 1 - > 0 over the duration of the current control stage, but a time curve may also be defined.
Notes •Adaptive remeshing cannot be performed if constraint relaxation is in progress.
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 | Active_flag Activation flag |
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Description |
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Defines whether the constraint relaxation is active. Generally not required as it is set by default. Valid values are: •-1 - Deactivate and remove if defined • 0 - Not defined • 1 - Defined and active (Default)
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| Displacement_geom_set List of geometry sets with displacement constraint relaxation |
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Description |
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The Geometry_sets keyword assigns the displacement constraint relaxation to individual geometry sets.
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| Pore_pressure_geom_set List of geometry sets with pore pressure constraint relaxation |
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Description |
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The Geometry_sets keyword assigns the pore pressure constraint relaxation to individual geometry sets.
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| Temperature_geom_set List of geometry sets with temperature constraint relaxation |
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Description |
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The Geometry_sets keyword assigns the temperature constraint relaxation to individual geometry sets.
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| Time_curve Time curve name or number |
Usage |
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Description |
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Specifies the time curve, by name or number, to be used in setting the constraint relaxation. If no time curve is assigned then an sramp (nonlinear curve to linear ramp) function that varies from 1 - > 0 will automatically be created over the duration of the Control_data step.
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