***auto_remesh#

Description#

The ***auto_remesh section is derived from ***initialize_with_transfer and allows automatic remeshing during a computation without stopping it. This is a backbone feature for crack propagation or computations using adaptive mesh.

Basically the auto_remesh bloc of commands is divided into:

  • mesher commands controlling the remesh process.

  • timing commands that trigger the automatic remeshing.

  • transfer commands that specify how to transfer data between original and modified meshes.

Note

  • The use of the Z8 output database is mandatory.

  • auto_remesh transfer only variables that have been saved to the output database. To transfer all variables, one should use **save_all command in ***output command bloc

  • The graphical interface scripts Zcracks and Zxfem may be used to handle crack propagation problems and automatically generate input data for this command.

Syntax#

***auto_remesh takes a number of ***initialize_with_transfer controls, and some additional specific commands.

***auto_remesh [ **output_after_remesh] [ **no_deform_mesh] [ **each_incr] [ **frequency] \(~\,~\,\) *  ... [**remeshing_criterion criterion ] \(~\,\) **mesher_commands \(~\,~\,~\,\) … % below options are inherited from initialize_with_transfer [ **quiet] [ **reequilibrium \(~\,~\,\) *algo algorithm \(~\,~\,\) *ratio convergence \(~\,~\,\) *iter max_iterations ] [ **skip_nodal_transfer ] [ **skip_integ_transfer ] [ **nodal_var_transfer [ *mapping mapping_method ] ] [ **integ_var_transfer [ *integ_transfer transfer_method ] ]

**output_after_remesh

save the results of the transfer to the database. With this option, Z8 database will contain two copies of the same results: the original data on the original mesh, and the transferred data on the new mesh obtained as a result of the specified mesher commands.

**no_deform_mesh

use initial configuration of the old mesh to locate the nodes/IP of current mesh (if not specified, the default behavior is to use deformed mesh)

**each_incr

force remeshing on each increment of current computation.

**frequency

used to trigger the remeshing process, for more sub options see

**remeshing_criterion

a more general remeshing triggerr. The possible criterion are summarized below

Criteria

at_time

quadratic_curving_criterion

element_shape_quality

for_crack_propagation

error_based
**mesher_commands

mesh manipulators commands see for usable commands.

Example#

***auto_remesh
%% AUTO_REMESH options
  **output_after_remesh
  **no_deform_mesh
  **frequency
   *at_time 0.02
%% INITIALIZE_WITH_TRANSFER options
  **integ_var_transfer default
   *locator bb_tree
   *integ_transfer nearest_gp_corrected
%% TRANSFORMERS
  **yams_ghs3d
   *no_deform_mesh
   *min_size  0.2
   *absolu
  **nset enc
   *use_bset enc

This example can be found in Crack_test/INP/cube_2cracks.inp

***global_parameter
  Solver.OutputFormat  Z8
  Zmaster.OutputFormat Z8

***auto_remesh
 **frequency
  *d_cycle 1
  *cycle_period 2.0
  *at 2.0
 **no_deform_mesh
 **skip_integ_transfer
 **skip_nodal_transfer
 **save TO_REMESH.geo
 **drive_crack
  *mesher cube_2cracks.inp
  *geo_in TO_REMESH.geo
  *geo_out REMESHED.geo
  *advance cube_2cracks.adv
  *separate
 **open REMESHED.geo

***output
 **save_parameter
 **save_all