zone densify command

Syntax

zone densify keyword <range>

Primary keywords:

global    gradient-limit    local    maximum-length    segments    repeat

This command finds all zones in the range and subdivides them into smaller zones filling the same volume. This will create new zones, and in general will create new gridpoints. The new zones will copy the group assignments of the original.

Note that this can create “hanging” gridpoints that are not perfectly connected to the surrounding grid. The zone attach by-face command should be used before cycling, to ensure continuous model behavior.

See Densifying Grids for a discussion and examples of the use of zone densification, and Geometry-Based Densification: Octree Meshing for discussion and examples the process of creating an “octree” mesh based on geometric data.

global

This specifies that the zone edges to which the segments keyword applies are the ones that most closely correspond to the global x, y and z axes.

gradient-limit

Zones chosen for densification will be checked to attempt to ensure that adjacent zones differ by, at most, one level of densification. This may mean more zones will be densified than actually fall into the range.

local

This is to set the zones to be densified in a local segment order. The local segment order is along the edges of e1, e2 and e3, where e1, e2 and e3 are the edges of the first and second, first and third, and first and fourth gridpoints of this zone. This is the default setting.

maximum-length f1 <f2 <f3 >>

This specifies the maximum edge lengths to be densified, in order. If f2 and f3 are not specified, they will be set to the same number as f1.

segments i1 <i2 <i3 >>

This specifies the subdivision number of zones to be densified, in order. If i2 and i3 are not specified, they will be set to the same number as i1.

repeat <i >

Repeats the densification i times, causing a recursive application of the range and densification settings. This can, for example, be used to create an octree grid. Note that if no number is given, then FLAC3D will repeat until the maximum-length is reached, applying the division specified in segments each time.