Util_set_control_data
Contents
Data Structure: Util_set_control_data |
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Description |
Control data for forward simulation |
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Util_set_control_data NUM=ival where ival is the data structure number |
Description |
Overview Util_set_control_data allows to define additional data required for a forward simulation created from restoration results. This data includes: •The porous flow type for the forward model (e.g. mechanical only or coupled simulation defined via Porous_flow_type ) •Sedimentation duration for all units (via Sedimentation_duration or Unit_sedimentation_duration ) •Time stepping data (via Target_number_time_steps and Number_time_increments ) •Mesh discretisation for initial mesh generation and adaptivity (via Element_size_bounds )
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 | Unit_names Unit names corresponding to sedimentation duration list |
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Defines the unit names (stratigraphy names) in the model so that a duration may be assigned to their corresponding stages using Unit_sedimentation_duration. The unit names should be ordered in depositional order (from oldest to youngest). (Maximum 32 characters each).
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| Unit_sedimentation_duration Duration of each sedimentation step |
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Defines the sedimentation stage duration for each unit defined in Unit_names. Note that each sedimentation stage in the forward model corresponds to one restoration stage. Note that the unit name list in Unit_names must be ordered in depositional order (from oldest to youngest).
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| Sedimentation_substeps Number of sub-steps for each sedimentation step (Default 1) |
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By default each stratigraphy unit in a restoration is sedimented as a single unit in the corresponding forward (i.e. a single element group in one control step). Thick units may optionally be split into several thinner units by sedimenting the layer in a specified number of sub-steps. Sedimentation_substeps defines a list of the number of units into which each sedimentation unit is split.
Notes •If Sedimentation_substeps is defined, it must be specified for all stratigraphy units defined in Unit_names. If a units should be deposited in a single step the number of sub-steps should be set to 1.
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| Damping Global damping factor |
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Defines the global damping factor to be applied in the forward simulation. The default value is 0.02 which corresponds to 2% of critical damping for the lowest natural frequency of the problem. It is recommended that this value is not exceeded as the solution may become over-damped.
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| Bulk_damping Bulk damping constant |
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Defines the value for the bulk damping constant. Bulk damping is generally used in forward simulations with a recommended value of 0.5
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| Target_number_time_steps The target number of time steps |
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Defines the number of target mechanical time steps in each stage for the forward simulation data file (Default: 20000)
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| Number_time_increments Number of time increments for the stage |
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Defines the number of time increments (coupling/flow steps) for each stage of the forward model when Porous_flow_type is set to 4. Thus the Initial_time_increment in each stage is evaluated by dividing the stage duration by the number of time increments.
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| Element_size_bounds Maximum and Minimum target element size |
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The Element_size_bounds specifies the maximum and minimum element sizes for the complete domain. The values are used for both initial mesh generation and adaptivity. The data comprises: •Location 1 - Maximum element size (values associated with the initial mesh) •Location 2 - Minimum element size (minimum value allowable during adaptive remeshing)
Notes •If Element_size_bounds is not specified then the default values are: •Maximum element size - approximately 1/10 of the thickness of the first stratigraphy unit •Minimum element size - 1/4 of the maximum element size
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| Porous_flow_type Porous flow type |
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The porous_flow_type defines how the pore space and pore fluid should be treated for the group in the geomechanical field. Valid types are: • 0 - Non porous material bulk density defined by the value specified in the grain density • 1 - Dry porous material bulk density defined using grain density and porosity • 2 - Drained prescribed pore pressure with non-zero pore pressures (both grain density and fluid density must be specified) • 3 - Undrained analysis (both grain density and fluid density must be specified) • 4 - Coupled geomechanical/porous flow (both grain density and fluid density must be specified) • 5 - Drained hydrostatic analysis by considering the buoyant bulk density (pore pressure not defined)
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| Transient_time_step_flag Adaptive time step based on the previous and next duaration time |
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This flag may be used to automatically output the appropiate keywords in each stage to consider a transient porous flow time step during the forward simulation. Valid types are: • 0 - Do not consider a trasient time step during the forward analysis (Default). This may results in an abrut flow step size between stages. • 1 - Consider a transient time step during the forward analysis. This prevents abrupt time step size changes between the different stages.
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