block gridpoint apply
command
Syntax
- block gridpoint apply keyword ... <range>
Primary keywords:
force force-x force-y force-z quiet quiet-x quiet-y quiet-z velocity velocity-normal velocity-x velocity-y velocity-z viscous viscous-x viscous-y viscous-z reaction reaction-x reaction-y reaction-z source temperature
Apply a boundary condition to block gridpoints.
- force v <[blockgpapplyblock]>
Set a load at location v (for deformable blocks only).
- force-x f <[blockgpapplyblock]>
Set a load in the \(x\)-direction.
- force-y f <[blockgpapplyblock]>
Set a load in the \(y\)-direction.
- force-z f <[blockgpapplyblock]>
Set a load in the \(z\)-direction.
Note
All loads are assumed to be constant and permanent by default, and are added to the existing permanent loads. Transient (time-varying) loading is applied if a \(fish\) or \(table\) keyword phrase is given on the same command line as the load (see below).
- quiet
Synonym for Viscous
- quiet-x <keyword ...>
Synonym for Viscous-X.
- quiet-y <keyword ...>
Synonym for Viscous-Y.
- quiet-z <keyword ...>
Synonym for Viscous-Z
- velocity v <[blockgpapplyblock]>
Set the velocity (for deformable blocks only).
- velocity-normal f <[blockgpapplyblock]>
- Set the normal direction velocity for deformable blocks. The normal direction is defined as the normal to the block face. Velocity boundary conditions will be removed if velocity-normal 0 is applied in the same direction as the velocity condition. Two or more velocity-normal 0 conditions can be applied at the same vertex. If normal constraints that satisfy all conditions cannot be found, the condition reverts to
block gridpoint apply velocity-x
0,block gridpoint apply velocity-y
0,block gridpoint apply velocity-z
0. Note also that if a normal velocity BC is applied to the same face twice, all degrees of freedom. will be fixed. - WARNING: This command requires that a whole face containing the vertex be within range. Unexpected results may occur depending on how the range is defined. Consider using
block face apply
instead.
- Set the normal direction velocity for deformable blocks. The normal direction is defined as the normal to the block face. Velocity boundary conditions will be removed if velocity-normal 0 is applied in the same direction as the velocity condition. Two or more velocity-normal 0 conditions can be applied at the same vertex. If normal constraints that satisfy all conditions cannot be found, the condition reverts to
- velocity-x f <[blockgpapplyblock]>
Set the \(x\)-direction velocity (for deformable blocks only).
- velocity-y f <[blockgpapplyblock]>
Set the \(y\)-direction velocity (for deformable blocks only).
- velocity-z f <[blockgpapplyblock]>
Set the \(z\)-direction velocity (for deformable blocks only).
- viscous
Set a viscous boundary in all direction on the specified range.
Note
Viscous boundaries cannot be used together with a velocity boundary. Viscous boundaries may be combined with stress boundaries. Nonreflecting boundaries are available for dynamic analyses.
- viscous-x <keyword ...>
Set a nonreflecting boundary in the \(x\)-direction.
- viscous-y <keyword ...>
Set a nonreflecting boundary in the \(y\)-direction.
- viscous-z <keyword ...>
Set a nonreflecting boundary in the \(z\)-direction.
- reaction <[blockgpapplyblock]>
Set point loads to be applied in the opposite direction to unbalanced forces at all vertices within the range. The command
model cycle 1
should be given before this command reaction so that unbalanced forces are calculated. Any velocity boundary conditions will be removed when this command is applied.
- reaction-x <[blockgpapplyblock]>
Set point loads to be applied in the opposite \(x\)-direction.
- reaction-y <[blockgpapplyblock]>
Set point loads to be applied in the opposite \(y\)-direction.
- reaction-z <[blockgpapplyblock]>
Set point loads to be applied in the opposite \(z\)-direction.
- source f <[blockgpapplyblock]>
A heat-generating source, f, is applied as a point source of the specified strength (e.g., in \(W\)) at each gridpoint in the specified range. When a new source is applied to a gridpoint with an existing source, the new source strength is added to the existing source strength.
- temperature f <[blockgpapplyblock]>
Temperature is fixed to f at all gridpoints in the specified range. The fish or table keyword can be used to prescribe a temperature history. (See below.)
block apply
Keyword Block
The keywords below are applicable to each of the following keywords of the \(block gridpoint apply\) command: force
, force-x
, force-y
, force-z
, reaction
, reaction-x
, reaction-y
, reaction-z
, source
, temperature
, velocity
, velocity-normal
, velocity-x
, velocity-y
and velocity-z
.
Was this helpful? ... | FLAC3D © 2019, Itasca | Updated: Feb 25, 2024 |