Prescribed Displacement
The Prescribed Displacement node adds a condition where the displacements in one or more directions are prescribed for the porous matrix domain, boundary, edge, or point (depending on space dimension). The condition can be added from the Porous Matrix Conditions submenu and it can be combined with any of the conditions found in the Fluid Conditions submenu.
If a displacement is prescribed in one direction, this leaves the porous matrix free to deform in the other directions. The condition can be added from the Porous Matrix Conditions submenu and it can be combined with any of the conditions found in the Fluid Conditions submenu.
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If a prescribed displacement is not activated in any direction, this is the same as a Free constraint.
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If a zero displacement is applied in all directions, this is the same as a Fixed Constraint for the porous matrix.
Coordinate System Selection
The constraints are applied in the directions of the coordinate system selected in this section. You should only use a coordinate system that has fixed spatial directions.
Prescribed Displacement
For the displacement in each direction, select Free or Prescribed. With Free (the default) the displacement component is left unconstrained. Use Prescribed to constrain the displacement to a given value.
Constraint Settings
To display this section, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box.
Prescribed Displacement Equations