FLASH4.5 API

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TABLE OF CONTENTS


[Functions] source/physics/Hydro/Hydro_consolidateCFL

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NAME

  Hydro_consolidateCFL

SYNOPSIS

  call Hydro_consolidateCFL()

DESCRIPTION

  Consolidate the CFL factors of different MPI tasks by a global
  reduction operation.

  Different MPI tasks may have computed different values for an updated Hydro
  CFL factor. This routine should be called before Hydro_computeDt is called
  to compute an updated Hydro time step.

ARGUMENTS

   No arguments

SIDE EFFECTS

  The CFL factor used by the Hydro unit is updated.

NOTES

  This routine must be called collectively by all MPI tasks in the global
  Hydro communicator.

  For split Hydro implementations, there is only a stub implementation of
  this interface which does not do any computation or communication.
  That is okay since unsplit Hydro implementations are not expected to
  modify the CFL factor that is given as a runtime parameter.