Fracture_set

Contents

Data Structure: Fracture_set
Description	Defines assignment/processing data associated with imported fracture definition
Usage	Fracture_set NUM=ival where ival is the data structure number

Description

Overview

This data structure defines the assignment and processing data associated with an imported fracture definition (e.g. from Fracman).

Name Fracture set name

Usage

Name

Character Name

Description

Defines the fracture set name (maximum 32 characters).

Discretisation Fracture discretisation type ("Discrete", "Embedded")

Usage

Discretisation

Character Name

Description

Defines the fracture discretisation type. Valid types are:

• "Discrete" - Discrete fractures represented using contact surfaces (default)

• "Embedded" - Embedded fractures

Fab_file_output Modified Fracman data file name

Usage

Fab_file_output

Character Name

Description

Defines the name of the modified Fracman data file to be output (maximum 32 characters).

Property_assignment Contact property set name

Usage

Property_assignment

Character Name

Description

Specifies the name of the Contact_property data structure defining the contact properties to be assigned for the set.

Volume Volume associated with fracture set in 3-D

Usage

Volume

Integer Value

Description

Defines the volume associated with the fracture set in 3-D. Currently the fracture set must be contained within a single volume.

Surface Surface associated with fracture set in 2-D

Usage

Surface

Integer Value

Description

Defines the surface associated with the fracture set in 2-D. Currently the fracture set must be contained within a single surface.

Active_flag Active flag for fracture set

Usage

Active_flag

Integer Value

Description

Active flag for fracture set. Valid values are:

• 0 - Do not process fracture set

• 1 - Process fracture set (Default)

Split_flag Flag defining whether a discrete fracture set should be created

Usage

Split_flag

Integer Value

Description

Flag defining whether a discrete fracture set should be created. Valid values are:

• 0 - Do not create discrete fractures

• 1 - Create discrete fractures (Default)

Element_size_type Flag defining type of element size definition

Usage

Element_size_type

Integer Value

Description

Flag defining the type of element size definition. Valid values are:

• 1 - Absolute size (default)

• 2 - Size relative to fracture length (e.g. 0.25 will give ca. 4 elements for the longest fracture side)

Element_size Target element size for elements adjacent to the fracture set

Usage

Element_size

Real Value

Description

Target element size for elements adjacent to the fracture set.

Fracture_element_size_list List of fractures assigned specific element size

Usage

Fracture_element_size_list		IDM=ival
Integer Values
where	ival	Number of data in region size vector

Description

Defines a list of fractures (by number) assigned specific element size (via Fracture_element_sizes).

Fracture_element_sizes List of fractures sizes

Usage

Fracture_element_sizes		IDM=ival
Real Values
where	ival	Number of data in region size vector

Description

Defines the list of element sizes corresponding to each fracture specified in Fracture_element_size_list.

Short_line_tolerance Short line tolerance for intersecting fractures

Usage

Short_line_tolerance

Real Value

Description

Short line tolerance for intersecting fractures.

Pre_intersect_out_flag Flag for fracture geometry intersection check

Usage

Pre_intersect_out_flag

Real Value

Description

Pre_intersect_out_flag outputs a geometry plot file and defines if a fracture geometry intersection check is to be performed or not (i.e. analysis terminated). This plot file may be used to visualise the location of the imported fractures within the model before computing fracture intersections. Valid values are:

• 0 - Do not terminate prior to geometry intersection (default)

• 1 - Terminate prior to geometry intersection

Output_level Defines output to the log file for the fracture generation process

Usage

Output_level

Integer Value

Description

Defines output to the log file for the fracture generation process. Valid output levels are:

• 0 - No data

• 1 - Summary data (default)

• 2 - Detailed information

Export_datafile_flag Debug plot file flag

Usage

Export_datafile_flag

Integer Value

Description

Export_datafile_flag defines the flag for determining if a data file is to be created/exported after intersection evaluation and analysis terminated. Valid values are:

• 0 - Do not export data file (default)

• 1 - Export data file post-generation and stop

Region_type Region type (Optional)

Usage

Region_type

Character Name

Description

Defines the type of fracture region (shape). Valid types are:

2-D

• "Rectangular" - Rectangular region in 2D

• "Circular" - Circular region in 2D

3-D

• "Rectangular" - Hexahedral region in 3D

• "Circular" - Spherical region in 3D

Region_size Size data for fracture region (Optional)

Usage

Region_size		IDM=ival
Real Values
where	ival	Number of data in region size vector

Description

Defines the size data for the fracture region. The size data is dependent on the region type:

Region type 0 - Complete Domain

No size data required

2-D "Rectangular region"

• Location 1 - Xmin

• Location 2 - Ymin

• Location 3 - Xmax

• Location 4 - Ymax

3-D "Rectangular" (hexahedral) region

• Location 1 - Xmin

• Location 2 - Ymin

• Location 3 - Zmin

• Location 4 - Xmax

• Location 5 - Ymax

• Location 6 - Zmax

2-D "Circular" region

• Location 1 - Xcent

• Location 2 - Ycent

• Location 3 - Radius

3-D "Circular" (spherical) region

• Location 1 - Xcent

• Location 2 - Ycent

• Location 3 - Zcent

• Location 4 - Radius

Excluded_fractures List of excluded fractures

Usage

Excluded_fractures		IDM=ival
Integer Values
where	ival	(Dimension) Number of fractures to be excluded

Description

Defines the list of excluded fractures (defined by number in Fracman data).

Exclude_size_type Size type of fractures to exclude

Usage

Exclude_size_type

Character Name

Description

Defines the size type of fractures to exclude. Valid types are:

• "Minimum_length" - Exclude based on the minimum length of any line on fracture

• "Maximum_length" - Exclude based on the maximum length of any line on fracture

• "Area" - Exclude based on the area of the fracture

Exclude_size Size data range for fracture region (Optional)

Usage

Exclude_size		IDM=ival
Real Values
where	ival	Number of data defining exclusion size (2)

Description

Defines the size data range for fracture exclusion which is dependent on the setting in Exclude_size_type.

•Location 1 - Minimum size

•Location 2 - Maximum size

Offset Offset of fracture set from defined coordinates (Optional)

Usage

Offset		IDM=ival
Real Values
where	ival	Number of dimension

Description

Offset defines the translation of the fracture set in the global X, Y and Z directions where

•Location 1 - Offset in X direction

•Location 2 - Offset in Y direction

•Location 3 - Offset in Z direction

Notes

•Offset is applied prior to Scale and exclusion by Region_size.

Scale Scale factors for size of fracture set (Optional)

Usage

Scale		IDM=ival
Real Values
where	ival	Number of dimension

Description

Scale defines the scaling of the fracture set in the global X, Y and Z directions where

•Location 1 - Scale factor in X direction

•Location 2 - Scale factor in Y direction

•Location 3 - Scale factor in Z direction

Notes

•Scale is applied prior to exclusion by Region_size.

Embedded_division_size Division size for mapping fracture data to elements

Usage

Embedded_division_size

Real Value

Description

Defines the division size for sub-division of the fracture geometry for mapping data from the fracture to the underlying elements. The mapping process sub-divides the fracture into a finer grid and any element containing a fracture point will be assigned fracture data.

Notes

•If Embedded_division_size is not specified then the division size will be established by dividing the longest fracture side length by the value in Embedded_division_num.

Embedded_division_num Number of divisions for mapping fracture data to elements

Usage

Embedded_division_num

Integer Value

Description

Defines the number of divisions for sub-division of the fracture geometry for mapping data from the fracture to the underlying elements (default 50). The mapping process sub-divides the fracture into a finer grid and any element containing a fracture point will be assigned fracture data.

Notes

•If Embedded_division_size is specified Embedded_division_num is not used.

Embedded_shrink_distance Distance to shrink the total size of all EDFM fractures

Usage

Embedded_shrink_distance

Real Value

Description

Defines the distance to shrink the total size of all EDFM fractures (Default: 0.0 - no shrinkage). This will shrink the fracture in all in-plane directions. Embedded_shrink_distance is required to prevent the fractures intersecting group and model boundaries.

Boundary_geometry_sets List of boundary geometry surfaces to be intersected

Usage

Boundary_geometry_sets		IDM=ival
Character Names
where	ival	(Dimension) Number of boundary surfaces to be intersect

Description

List of boundary geometry surfaces to be intersected.

Boundary_geometry_type Boundary geometry type

Usage

Boundary_geometry_type

Integer Value

Description

Defines the boundary geometry type. Valid types are:

• 0 - Internal boundary (e.g. hole etc), Default

• 1 - External boundary

Geometry_type Geometry type

Usage

Geometry_type

Character Name

Description

Defines the geometry type of the imported fractures. Valid types are:

• Flat - Flat (Default)

• Edfm - Edfm