vk.com/club152685050Rezoning | vk.com/id446425943

The reported stresses and strains represent the total stresses and strains from TIME = 0. However, the reported displacements are from the rezoned time or substep (when the element coordinates were updated via the REZONE command).

After the MAPSOLVE command has executed, the new mesh may be somewhat distorted, and the distortion may be even more significant if the residual forces are large. In such a case, more careful region selection and better remeshing are necessary.

4.9.4. Handling Convergence Difficulties

If the rezoning process encounters convergence difficulties during the mapping (MAPSOLVE) stage of the rezoning process, try the following:

•Specify a larger maximum number of mapping substeps (although no more than 500) via the MAPSOLVE command.

•Minimize the differences in mesh density and topology between the old and new mesh, especially in the elements on boundaries.

•Rezone from an earlier substep (so that you can start with a slightly less distorted original mesh).

•Enhance the quality of the new mesh.

4.10. Step 7: Perform a Multiframe Restart

After successfully mapping (MAPSOLVE) solved variables from the old mesh to the new mesh and checking the mapped results, continue the solution based on the new mesh via a standard multiframe restart from the last mapping substep (that is, the substep at which you initiated rezoning plus the number of substeps required by the mapping operation).

Even if you have rezoned several times in the same domain, you can still perform a standard multiframe restart.

You can restart from any substep at which the .rxxx file, .rdb file, and .ldhi load history file exist. You need only specify the substep to restart; the program detects the necessary .rdb file, and the

.rst file to modify, then finds the corresponding load history information from the .ldhi file.

After the restart, the program deletes all .rdb, .rst, and .rxxx files on the substeps subsequent to the specified restart substep.

This step concludes the rezoning process. At this point, you can repeat the rezoning process if you wish, or perform postprocessing on the rezoned analysis results.

4.11. Repeating the Rezoning Process if Necessary

More than one rezoning may be necessary if a mesh distortion still exists in the domain despite a previous rezoning. You can rezone a domain that you have already rezoned by selecting a region (or regions) in the same domain at a different time and substep than that of the initial rezoning.

To rezone again, a region that you select for remeshing can be the same region that you selected in a previous rezoning or a different region. As in the initial rezoning, you can use horizontal rezoning to select more than one region for remeshing.