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sampledSet 'uniform' does not produce same output in parallel

Summary

different number of samples when run in parallel.

Steps to reproduce

Take pitzDaily tutorial. Use decomposeParDict with

//- The total number of domains (mandatory)
numberOfSubdomains  2;

////- The decomposition method (mandatory)
method          random;

There will be 10 tracks when running in parallel but only 1 when running in parallel.

Environment information

  • OpenFOAM version : develop (but probably also v1906)
  • Operating system : openSUSE
  • Hardware info :
  • Compiler :

Possible fixes