You can define ALE adaptive mesh
constraints on the motion of the mesh for an adaptive mesh domain. The
ALE adaptive mesh constraint can either
prescribe independent mesh motion for nodes in an adaptive mesh domain or
specify nodes that must follow the material. For more information, see the
following sections:
From the main menu bar, select
OtherALE Adaptive Mesh
ConstraintCreate.
Abaqus/CAE
displays the ALE adaptive mesh constraint
editor.
Enter a name for the ALE adaptive
mesh constraint.
Select the step in which you want to create the constraint.
Choose the type of mesh motion,
Displacement/Rotation or Velocity/Angular
velocity, and click Continue.
Use one of the following methods to select the region that you want to
constrain:
Use an existing set to define the region. On the right side of the
prompt area, click Sets. Select an existing set from the
Region Selection dialog box that appears, and click
Continue.
Use the mouse to select a region in the viewport. (For more
information, see
Selecting objects within the current viewport.)
Click mouse button 2 to indicate you have finished making selections.
Abaqus/CAE
highlights the selected regions in red in the viewport.
Note:
The default selection method is based on the selection method you
most recently employed. To revert to the other method, click Select
in Viewport or Sets on the right side of the
prompt area.
The Edit ALE Adaptive Mesh
Constraint dialog box appears.
If you are editing an existing mesh constraint you can edit the region
to which the constraint is applied by clicking
in the top part of the editor. Use the region selection
techniques described in Step 5.
If you want to change the coordinate system
(CSYS) in which to apply the constraint, click
and use one of the following methods:
Select an existing datum coordinate system in the viewport.
Select an existing datum coordinate system by name.
From the prompt area, click Datum CSYS
List to display a list of datum coordinate systems.
Select a name from the list, and click
OK.
Click Use Global CSYS from the prompt area
to revert to the global coordinate system.
This coordinate system editing option is available only in the step
in which the constraint is created.
Click the arrow to the right of the Motion field,
and specify whether you want to prescribe mesh motions that are independent of
the underlying material or define nodes that must follow the underlying
material.
If you are performing an
Abaqus/Standard
analysis, you can also choose to define mesh motion in user subroutine
UMESHMOTION.
If you selected Independent of underlying
material in Step 8, toggle on the degrees of freedom that you want
to constrain. The text field becomes available in which you can specify a value
for the degree of freedom. Toggle off a degree of freedom to leave the degree
of freedom unconstrained.
If you selected Independent of underlying
material in Step 8, click the arrow to the right of the
Amplitude field, and select the amplitude of your choice
from the list that appears. Alternatively, you can click
Create to create a new amplitude. (See
The Amplitude toolset
for more information.)
Click OK to save the named constraint and to
close the editor.