unresolved command

Syntax

fix id group fragmentation/bruchmueller/unresolved keyword value ...

ID, group-ID are documented in fix command
fragmentation/bruchmueller/unresolved = style name of this fix command
keywords = verbose or number_psd_classes or number_fragment_size_classes

verbose value = yes or no or file
  yes  = report on occurrence of fragmentation and resulting changes in the fragment PSD
  no   = suppress output on fragmentation
  file = write report to separate file
number_psd_classes  value
  value = max number of sizes in PSD, thus limits the size of the smallest fragment
number_fragment_size_classes value
  value = number of fragment sizes created upon fragmentation

Examples

fix fragmentation   all fragmentation/bruchmueller/unresolved
fix fragmentation   all fragmentation/bruchmueller/unresolved verbose on &
      number_psd_classes 11 number_fragment_size_classes 6

Description

Fix fragmentation/bruchmueller/unresolved treats particle fragmentation upon collisions in an unresolved manner as described in gran model hertz/fragmentation/bruchmueller.

This fix requires the definition of several material properties:

fix id all property/global breakageE0timesD peratomtype value_1 value_2 ...
    (value_i=value for E_impact_0 * particle diameter of atom type i)
fix id all property/global breakageProbabilityParam peratomtype value_1 value_2 ...
    (value_i=value for breakage probability parameter of atom type i)
fix id all property/global breakageSizeParam peratomtype value_1 value_2 ...
    (value_i=value for breakage size parameter of atom type i)

Upon fragmentation, fragments of different sizes are created. The number of the sizes is controlled by the argument number_fragment_size_classes which must be chosen between one and six.

With verbose file the fragmentation report of each individual processor is written to a separate file named log_fragmentation.txt.<procNr> or log_fragmentation.txt if running on a single core. The report written to the separate file contains slightly more information than the verbose output – namely the time, id, and original diameter of the fragmented particle are printed before the collision energy, t10, the resulting PSD, and the resulting Sauter diameter.

Restart, fix_modify, output, run start/stop, minimize info

All of the quantities used by this fix are written to binary restart files so simulations can continue properly. None of the fix_modify options are relevant to this fix.

No parameter of this fix can be used with the start/stop keywords of the run command.

Restrictions

none

Default

verbose = off, psd_length = 10, n_fragment_sizes = 6