Spatial_variation_definiition
Contents
Data Structure: Spatial_variation_definition |
|
Description |
Spatial property variation data |
Usage |
Spatial_variation_definition NUM=ival where ival is the data structure number |
Description |
Overview The Spatial_variation_definition data structure allows a spatial variations to be assigned to any property variable, i.e. material property, stress, etc. Usage of the depth dependent data requires an additional assignment in the relevant data structure (i.e. Geostatic_data). The spatial variation can be specified as either: •Time independent, via Variation_assignment. In this case the spatial variation is defined using the Spatial_variation_values data structure •Time dependent, via Spatial_variation_time, which allows assignment of a list of Spatial_variation_values corresponding to specific times. The value at any specific time is then evaluated using a combination of spatial and temporal interpolation.
The spatial variation may be defined as being either: •Depth dependent values, via Value_vs_depth, where the depth is the depth below the current top surface of the model. •Values specified on a grid, via Grid_number, which may be defined as a regular grid in 1-D, 2-D or 3-D, or as an unstructured tetrahedral grid. Examples
|
 | Name Spatial variation name |
Usage |
||||
|
||||
Description |
||||
Name of spatial variation (Maximum 32 characters)
|
| Description Description of spatial variation |
Usage |
||||
|
||||
Description |
||||
An optional description for the property or the spatial variation enclosed in quotes if spaces exist; e.g. "porosity vs. depth"
|
| Type Defines if the spatial variation is absolute or relative |
Usage |
||||
|
||||
Description |
||||
Type defines whether the spatial variation is defined via absolute values or via multipliers. Valid data are: • "Absolute" - Spatial variation values correspond to the property absolute value • "Multiplier" - Spatial variation values are multipliers for the property value. By default the reference value is defined on the corresponding data structure. This value can however be overwritten by defining Reference_value on this data structure.
Notes •If not specified the default is "Absolute"
|
| Distribution Defines if the spatial variation distribution type |
Usage |
||||
|
||||
Description |
||||
Distribution defines the type of spatial distribution. Valid values are: • "Depth_dependent" - Values in the spatial variation are defined as a function of depth below the current top surface
Notes •If not specified the distribution is automatically set using the distribution defined on the Spatial_variation_values data structure(s) assigned to the Spatial_variation_definition.
|
| Reference_value Reference value for property |
Usage |
||||
|
||||
Description |
||||
Optional parameter for Type = "Multiplier" that when defined results in the spatial variation data being scaled by the Reference_value rather than the value defined on the application data structure; e.g. Geostatic_data. The value ( Val) is defined as: Val = Valref * fspat where Valref is the reference and fspat is the spatial variation multiplier.
|
| Variation_assignment Spatial variation assignment number |
Usage |
||||
|
||||
Description |
||||
Spatial variation set number to be used for property if no time variation is required.
|
| Time_variation_assignment List of spatial variation sets defining the time variation |
Usage |
|||||||||||||||
|
|||||||||||||||
Description |
|||||||||||||||
List of spatial variation sets numbers defining the time variation of the property. The list should be defined in ascending order of time
|
|||||||||||||||
| Update_time Time step for updating spatial variation search data |
Usage |
||||
|
||||
Description |
||||
The location of all nodes and elements relative to the spatial variation grid or definition is evaluated when the spatial variation data is initially processed. If the spatial variation is applied using a time dependent variation ongoing deformation may necessitate re-interpolation of this location data. The frequency of this re-interpolation may be specified using either: •Update_time - the increment in time between updates of the mesh interpolation data •Update_increment - the number of time steps between updates of the mesh interpolation data
|
| Update_increment Time step for updating spatial variation search data |
Usage |
||||
|
||||
Description |
||||
The location of all nodes and elements relative to the spatial variation grid or definition is evaluated when the spatial variation data is initially processed. If the spatial variation is applied using a time dependent variation ongoing deformation may necessitate re-interpolation of this location data. The frequency of this re-interpolation may be specified using either: •Update_time - the increment in time between updates of the mesh interpolation data •Update_increment - the number of time steps between updates of the mesh interpolation data
|