zone separate
command
Syntax
- zone separate keyword
-
Separates internal faces, making a new internal surface. Gridpoints are duplicated.
New gridpoints get copies of all group and extra variable assignments belonging to the original face and gridpoint.
There are two available methods of separation.
- by-face <range>
Select internal faces in the range, and separate the gridpoints on either side to make it a new internal surface.
New faces get a copy of the original face group assignments.
One (consistent) side of the newly created faces will have a new group assignment made, to make it easier to distinguish one side from the other after creation (since they will be in the same location in space). By default, the new side will be assigned the group
NewSideX
in slotSeparate
, whereX
is a number starting at1
and incrementing with eachzone separate
command. Thenew-side
keyword can be used to specify which side is assigned and the group and slot name used.Note that this command uses a different algorithm than in past versions of FLAC3D, and should work correctly on zone regions that are not perfectly topologically connected, such as commonly result from a
zone densify
command.The most recent separation algorithm will leave internal boundaries attached (consistent with an internal fault) and will create more than one new grid point if a region is created with multiple separations (if a T-shaped intersecting fault is created, for example).
- clear-attach
By default, an error occurs if any gridpoint that has an attach condition associated with it is found among those to be separated. However, if the
clear-attach
keyword is supplied, then the separation of gridpoints will occur regardless. In addition, FLAC will remove any attach conditions connected to gridpoints affected.
- new-side keyword
- origin v
Specify a location in space used to determine which side is assigned to the new group. If the vector from the
origin
to the face centroid is in the opposite direction then the group name is assigned. This check is made to the first valid face encountered, and the side is kept consistent from then on. By default, theorigin
is (0,0,0) in FLAC3D and (0,0) in FLAC2D.- group s <slot s >
Newly created faces will be assigned the group
s
in the specified slot. The default slot, which is used ifslot
s
is not supplied, is namedDefault.
FLAC determines which face will be new and which one will be old by using theorigin
keyword. Use of the group logic is described in Groups.
- group-both
Apply the group with sOther appended to the group name to the old faces.
- by-slot s <range>
Select internal faces in the range, and separate the gridpoints on either side to make it a new internal surface.
Faces with group names in slot s are processed sequentially by group name. This allows for sequential separation in cases where faces to be separated intersect one another.
New faces get a copy of the original face group assignments.
One (consistent) side of the newly created faces will have a new group assignment made, to make it easier to distinguish one side from the other after creation (since they will be in the same location in space). By default, the new side will be assigned the group
NewSideX
in slotSeparate
, whereX
is a number starting at1
and incrementing with eachzone separate
command. Thenew-side
keyword can be used to specify which side is assigned and the group and slot name used.Note that this command uses a different algorithm than in past versions of FLAC3D, and should work correctly on zone regions that are not perfectly topologically connected, such as commonly result from a
zone densify
command.The most recent separation algorithm will leave internal boundaries attached (consistent with an internal fault) and will create more than one new grid point if a region is created with multiple separations (if a T-shaped intersecting fault is created, for example).
- clear-attach
By default, an error occurs if any gridpoint that has an attach condition associated with it is found among those to be separated. However, if the
clear-attach
keyword is supplied, then the separation of gridpoints will occur regardless. In addition, FLAC will remove any attach conditions connected to gridpoints affected.
- new-side keyword
- origin v
Specify a location in space used to determine which side is assigned to the new group. If the vector from the
origin
to the face centroid is in the opposite direction then the group name is assigned. This check is made to the first valid face encountered, and the side is kept consistent from then on. By default, theorigin
is (0,0,0) in FLAC3D and (0,0) in FLAC2D.- group s <slot s >
Newly created faces will be assigned the group
s
in the specified slot. The default slot, which is used ifslot
s
is not supplied, is namedDefault.
FLAC determines which face will be new and which one will be old by using theorigin
keyword. Use of the group logic is described in Groups.
- group-both
Apply the group with sOther appended to the group name to the old faces.
- by-zone keyword ...
Separate zone regions. All grid points connected to zones in
range-1
that are also connected to zones inrange-2
will be assigned new grid points that are only connected to the zones inrange-1
.This can be used to cleanly and completely separate two regions of zones. Note that if this is used to create an internal fault, then the boundaries of the fault will be separated (unlike the
by-face
keyword above) and the surface will have effectively one face more of separation around the boundary.While both
range-1
andrange-2
are optional, ifrange-1
is not specified then no separation will occur, since there will be no zones to separate from. Ifrange-2
is not specified then all zones inrange-1
will be separated from all other zones in the model—along the entire boundary of the set of zones inrange-1
.- clear-attach
By default, an error occurs if any gridpoint that has an attach condition associated with it is found among those to be separated. However, if the
clear-attach
keyword is supplied, then the separation of gridpoints will occur regardless. In addition, FLAC will remove any attach conditions connected to gridpoints affected.
- range-1 <keyword ...>
Specify the range used to select zones that will be separated. Any grid points connected to zones in this range that are also connected to zones in
range-2
will be separated.
- range-2 <keyword ...>
Specify the zones that will trigger a separation. If left as the default value (all zones included) then the entire boundary of the set of zones in
range-1
will be separated.
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