MESHING MERGE ALL/setname [Control]

            

This command is used after the MESHING GENERATE command to merge any nodes within a certain distance of each other. The defaults are that the merge tolerance will be as specified in the CONSTRUCT SPACE TOLERANCE command, the merges will not be saved, and that degenerate elements may be created during the operation. The number of degenerate elements existing after the MESHING MERGE operation will be given in a warning message and the location of any degenerate elements will be shown by red markers.

Control Comments

NOSAVE (The default). The merges identified during the operation will not be stored. This means that they will be lost if the model is remeshed, and the 'MESHING MERGE' command will have to be reissued. This is the fastest way of working, but the user needs to remember to carry out a final merge once the model is complete.

SAVE The merges identified during the operation will be stored in the data base and will be used to automatically merge nodes in any subsequent meshing operations. This may result in longer mesh regeneration times for large models.

NOCHECK (The default). The creation of degenerate elements will not be prevented during the merging operation; the total number of degenerate elements will be given on completion of this command. Degenerate elements will be highlighted with red markers. This is the fastest way of working.

CHECK The creation of degenerate elements will be prevented; the merge tolerance may be temporarily reduced during the operation to half the distance between the two closest nodes on an element. A warning will be given if the tolerance is overridden.

Tolerance The tolerance to be used in the merging operation. The default is the current value of the absolute tolerance as set with CONSTRUCT SPACE TOLERANCE ABSOLUTE

Where nodes are merged a white merging symbol will be used to provide graphical feedback for this operation. This may be controlled with the 'UTILITY SETUP FEEDBACK' command.

When 'MESHING MERGE setname' is used the merging operation will be limited to the nodes on the geometry in the specified set.

Examples:

1.

MESHING MERGE ALL

Any nodes within the current tolerance will be merged. Merges will not be saved. If degenerate elements are created then a warning will be issued.

2.

MESHING MERGE ALL 0.001

Any nodes within 0.001 will be merged. Merges will not be saved and if degenerate elements are created a warning will be issued.

3.

MESHING MERGE SE8 SAVE

Any nodes on part SE8 within the current tolerance will be merged and the merges will be saved and used in subsequent mesh generation operations. If degenerate elements are created then a warning will be issued.

4.

MESHING MERGE SE8 SAVE CHECK 0.001

The meshing merge operation will be carried out on set SE8 with an initial tolerance of 0.001 but a preliminary check for degeneracy will be made possibly resulting in a reduction of this initial tolerance. Warnings will be given. Merges will be saved for use in subsequent meshing operations.

See also the following commands

'CONSTRUCT MERGE'
'CONSTRUCT SPACE TOLERANCE'
'MESHING MERGE'
'UTILITY TABULATE MESH MERGE'
'UTILITY DELETE MERGE'
'UTILITY SETUP FEEDBACK MESHING MERGE '