Geometry_surface

 

Data Structure: Geometry_surface

Description

Geometry surfaces and associated definition data

Usage

Geometry_surface     NUM=ival   where ival  is the data structure number

 

Description

Overview

The Geometry_surface data structure stores the definition of a geometry surface together with the associated data including:

•Lines that define the surface

•Surface mesh or tessellation if present

•Edge table and background mesh element data

•Background mesh if present

•Mesh generation related data

 

Notes

•A Geometry_surface data structure is defined for each surface

•The Geometry_surface data structure may be updated during the analysis due to remeshing operations and geometry update operations; e.g. deposition, erosion, pinchout, etc.

 

 

Click to expand/collapseNodes    List of nodes defining surface

Usage

Nodes

IDM=ival

 

 

Integer Values

 

 

 

 

where

ival

Number of nodes defining surface

Description

List of nodes defining surface.

 

 

Click to expand/collapseElements    List of elements defining surface

Usage

Elements

IDM=ival

 

 

Integer Values

 

 

 

 

where

ival

Number of elements defining surface

Description

List of elements defining surface.

 

 

Click to expand/collapseFaces    List of faces for each element defining surface

Usage

Faces

IDM=ival

 

 

Integer Values

 

 

 

 

where

ival

Number of faces defining surface

Description

List of faces for each element defining surface.

 

 

Click to expand/collapseFacets    List of facets for current mesh (for volume meshes)

Usage

Facets

IDM=ival

JDM=jval

 

Integer Values

 

 

 

 

where

ival

jval

Number of nodes on the element facets

Number of faces defining surface

Description

List of facets for current mesh (for volume meshes).

 

 

Click to expand/collapseFacets_nnode    Number of nodes on each facet for volume meshes

Usage

Facets_nnode

IDM=ival

 

 

Integer Values

 

 

 

 

where

ival

Number of faces defining surface

Description

Number of nodes on each facet. Only required if the volume elements have a mixed number of nodes on the facet; e.g. pentrahedral (prism) or pyramid.

 

 

Click to expand/collapseTopology    Element topology for current mesh (for surface meshes)

Usage

Topology

IDM=ival

JDM=jval

 

Integer Values

 

 

 

 

where

ival

jval

Number of nodes on the element

Number of elements defining surface

Description

Element topology for current mesh (for surface meshes).

 

 

Click to expand/collapseProperties    Properties for current mesh

Usage

Properties

IDM=ival

JDM=jval

 

Real Values

 

 

 

 

where

ival

jval

Number of properties for surface

Number of elements defining surface

Description

Properties for current mesh.

 

 

Click to expand/collapseVolumes    List of volumes using the surface

Usage

Volumes

IDM=ival

 

 

Integer Values

 

 

 

 

where

ival

Number of volumes using the surface

Description

List of volumes using the surface.

 

 

Click to expand/collapseVolume_elements    List of element pointers to volume

Usage

Volume_elements

IDM=ival

JDM=jval

 

Integer Values

 

 

 

 

where

ival

jval

Number of faces defining surface

Number of volumes using the surface

Description

List of pointers to the element corresponding to each surface facet for each volume.

 

 

Click to expand/collapseVolume_Faces    List of faces for the element corresponding to each surface facet for each volume

Usage

Volume_Faces

IDM=ival

JDM=jval

 

Integer Values

 

 

 

 

where

ival

jval

Number of faces defining surface

Number of volumes using the surface

Description

List of faces for the element corresponding to each surface facet for each volume.

 

 

Click to expand/collapseTsurf_filename    Name of file containing gocad tsurf definition for surface

Usage

Tsurf_filename

Character Name

 

 

Description

Name of file containing gocad tsurf definition for the surface.

 

 

Click to expand/collapsePart_geometry    Part geometry surfaces to be used as a background mesh

Usage

Part_geometry

IDM=ival

 

 

Character Names

 

 

 

 

where

ival

Number part geometry surfaces

Description

Part geometry surface to be used as a background mesh. The part geometry surfaces do not have to conform with the geometry of the lines defining the surface but must be sufficiently large to fully encompass the geometry surface.

 

Click to expand/collapseSurface_type    Surface type (1-linear param, 2-quadratic param, 3-cubic param, 4-Tessellated, 5-multi-sided fla

Usage

Surface_type

Integer Value

 

 

Description

Surface type:

• 1 - Linear parametric (Structured mesh only)

• 2 - Quadratic parametric (Structured mesh only)

• 3 - Cubic parametric (Not available)

• 4 - Tessellated (Unstructured mesh only)

• 5 - Multi-sided flat (Structured and Unstructured mesh)

 

 

Click to expand/collapseMesh_check_level    Level of checking for complex surface during mesh generation

Usage

Mesh_check_level

Integer Value

 

 

Description

Defines the level of checking for complex surface during mesh generation. Valid mesh check levels are:

• 1 - Full checking (default)

• 2 - Reduced checks for simple surfaces or surfaces with poor background grids (save CPU time)

 

 

Click to expand/collapseLines    List of lines defining surface

Usage

Lines

IDM=ival

 

 

Integer Values

 

 

 

 

where

ival

Number of lines defining surface

Description

List of lines defining surface.

 

 

Click to expand/collapseInternal_line_flag    Flag denoting that lines are internal lines

Usage

Internal_line_flag

IDM=ival

 

 

Integer Values

 

 

 

 

where

ival

Number of lines defining surface

Description

Flag denoting that lines are internal to the surface and not forming part of an internal surface boundary; i.e. a hole in the surface (either a true hole or another surface contained within this surface.