2.10. Multiple Remeshings with Nonlinear Mesh Adaptivity

Nonlinear adaptivity supports unlimited remeshing in a given analysis. When a remesh occurs, the new geometry is stored in a new .rdnn database file (where nn = 01 to 99).

If more than 99 remeshings occur, the newer .rdnn files overwrite the oldest beginning from .rd01, saving storage space and enabling you to perform a restart from more recent successful substeps.

The .rmsh remesh monitor file provides an overview of the remeshing behavior during a nonlinear adaptivity analysis.

Example 2.6: Remesh Monitor File

ATTEMPT     SUCCESS     LOAD    SUB-   RDB    REMESH
    NUM             STEP    STEP   NUM    REASON
     1         1         1        2    -1       1
     2         2         1        3    -1       2
     3                   1       13             1      
     4         3         1       14     1       3
     5         4         2        5    -1       1
     6         5         2       11     2       1 
     7         6         2       25    -1       1
     8         7         2       42     3       3

The columns in the .rmsh file offer the following information:

ATTEMPT NUM

Number of remeshing attempts (eight in the example).

SUCCESS NUM

Indicates whether or not the given remeshing attempt was successful. The number shown represents cumulative successes (seven in this case). A blank indicates an unsuccessful remeshing attempt (number 3 in the example).

LOAD STEP

The load step number at which the remeshing attempt occurred.

SUBSTEP

The substep number at which the remeshing attempt occurred.

RDB NUM

The .rdnn file identifier.

A positive integer indicates that a file was created. A -1 indicates that no file was created. The example shows that:

In load step 1, the .rd01 file was created at substep 14.
In load step 2, two files were created: .rd02 at substep 11, and .rd03 at substep 42.

For more information about how the .rdnn file is written, see RESCONTROL.

REMESH REASON

The reason for which the remeshing attempt occurred:

1 – Remeshing due to mesh distortion

2 – Remeshing for mesh refinement

3 – Remeshing for mesh coarsening

4 – Remeshing by mesh morphing

5 – Remeshing a hexagonal element (SOLID185 or SOLID186) to a tetrahedral element (SOLID187) mesh

6 – Remeshing due to element removal

7 – Remeshing due to material removal

For a remeshing with more than one remesh reason, each reason number will be listed. For example, a combined remeshing with distortion (1) and refinement (2) is identified as 12.

You can control how frequently your analysis writes .rdnn files (RESCONTROL).