Spatial_grid_group
Contents
Data Structure: Spatial_grid_group |
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Description |
data structure |
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Spatial_grid_group NUM=ival where ival is the data structure number |
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Overview The Spatial_grid_group data structure defines the topology of a mesh together with associated values of variables that will be assigned to elements and nodes of the current mesh. Each Spatial_grid_group is associated with a parent Spatial_grid via the Grid_name. If a single model group is associated with the Spatial_grid_group this can be defined using Group_assignment. If, however, the Spatial_grid_group data will be applied to multiple groups this can be specified when the grid data is used; e.g. using Spatial_state_set.
Notes •Spatial_grid_mesh is equivalent to Spatial_grid_group and both inputs are valid.
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 | Name Name of the spatial grid group |
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Name of the Spatial grid group (Maximum of 32 characters)
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| Group_assignment_number ParaGeo Group number associated with spatial grid group |
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Defines the ParaGeo Group number to which the Spatial_grid_group will be assigned. This is only required in case that the spatial grid is applied to a single group.
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| Group_assignment ParaGeo Group name associated with spatial grid group |
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Defines the ParaGeo Group name to which the Spatial_grid_group will be assigned (Default is the spatial grid group name). This is only required in case that the spatial grid is applied to a single group.
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| Grid_number Number of the parent grid associated with the grid group |
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Number of the parent grid associated with the spatial grid group. This enables association of the correct data with a grid if more than one grid exists.
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| Grid_name Name of the parent grid associated with the grid group |
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Name of the parent grid associated with the spatial grid group. This enables association of the correct data with a grid if more than one grid exists.
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| Element_type The type of element |
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The type of the element defining the group. Valid types are: • MIXED - Mixed element type (output of grid data only) • QUAD4 - 4 noded quadrilateral • TRIA3 - 3 noded triangle • TET4 - 4 noded tetrahedra • HEX8 - 8 noded hexahedra • WEDGE6 - 6 noded 3D Wedge (pentahedra) • PYRAMID5 - 5 noded pyramid
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| Topology Element topology |
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Defines the element topology for the spatial grid group. The element topology should be defined in standard ParaGeo format. For example for a 4-noded quadrilateral grid: E1N1 E1N2 E1N3 E1N4 E2N1 E2N2 E2N3 E2N4 (...) EnN1 EnN2 EnN3 EnN4
Where En indicates the element number and Nn the node number of the En element.
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| Element_types Type of each element |
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Type of each element. Not required for input grids but is automatically created for output groups if the element type is MIXED; i.e. containing elements of different type
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| Number_element_nodes Number of nodes for each element |
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Number of nodes for each element. Not required for input grids but is automatically created for output groups if the element type is MIXED; i.e. containing elements of different type
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| Node_numbers Node numbering for group |
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List of node numbers for group (optional). If node numbers are not defined then ascending order is assumed
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| Coordinates Nodal coordinates |
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List of Node coordinates for the topology defining the group
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| Configuration_type Configuration corresponding to the coordinates |
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Configuration corresponding to the coordinates. Valid values are: • "Current" - Coordinates in current configuration i.e. coordintes = original coordinates + displacements (default) • "Initial" - Coordinates in initial configuration
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| Element_variables List of element centre variables |
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List of element centre variables to be output. Valid element variables are field dependent comprise state variables and and element based variables including:
All fields •Elt_volu - element volume (3-D) or area (2-D) •Porosity - element porosity •Elt_pore - element average pore pressure •Elt_temp - element average temperature •Mat_no - Material assignment number •Group_no - Group assignment number •Depth - Depth below surface (if present)
Geomechanical field General variables: •Elt_mass - Element mass •Crit_tim - Element critical time step •Elt_dens - Element density •Por_geoc - Current pore pressure in geomechanical field (Coupled analysis with undrained split only) •Por_Geot - Current pore pressure in geomechanical field (Coupled analysis with undrained split only) •Cou_stif - Current Coupling Bulk modulus in geomechanical field (Coupled analysis with undrained split only) Stress Components: •Strs_xx - Direct Stress in X direction •Strs_yy - Direct Stress in Y direction •Strs_zz - Direct Stress in Z direction •Strs_xy - Shear Stress in XY direction •Strs_yz - Shear Stress in YZ direction (3-D only) •Strs_zx - Shear Stress in ZX direction (3-D only) Stress Invariants: •Press - Effective mean stress (p') •Efstrs - Deviatoric effective stress (q) •Strs_p1 - Principal stress 11 - (most tensile) •Strs_p2 - Principal stress 22 - (intermediate) •Strs_p3 - Principal stress 33 - (Most compressive) Strain Components: •Strn_xx - Direct Strain in X direction •Strn_yy - Direct Strain in Y direction •Strn_zz - Direct Strain in Z direction •Strn_xy - Shear Strain in XY direction •Strn_yz - Shear Strain in YZ direction (3-D only) •Strn_zx - Shear Strain in ZX direction (3-D only) Strain Invariants: •Vol_stn - Volumetric strain •Efstrn - Deviatoric effective strain •Strn_p1 - Principal strain 11 - (most tensile) •Strn_p2 - Principal strain 22 - (intermediate) •Strn_p3 - Principal strain 33 - (Most compressive)
Porous flow field •None
Thermal field •None
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| Element_values Element values |
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Table of element values
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| Nodal_variables List of nodal variables |
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List of nodal variables for group (not implemented)
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| Nodal_values Nodal values |
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Table of nodal values (not implemented)
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| Element_numbers List of selected element numbers |
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List of selected element numbers for group (optional).
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| Default_values Default values |
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Default values for the group, this will be used instead of the original value
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| Geometry_entity Geometry entity containing each element |
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The geometry entity (2-D: surface , 3-D: volume) for each element in the group
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| Fracture_set Name of the fracture set to be used to assign the fracture state |
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Name of the fracture set to be used to assign the fracture state
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| Time_variation_assignment List of spatial variation sets defining the time variation |
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List of spatial variation sets numbers defining the time variation of the property. The list should be defined in ascending order of time
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| Null_value Value identifying that the grid value is not set |
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The Null_value Value identifying that the grid value is not set. In this case any element or node where the mapped value includes a contribution from a null value, then the value for the element or node will not be mapped. The null value can therefore be used to assign values to part of a group.
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