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 * Code_Saturne documentation page
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/*
  This file is part of Code_Saturne, a general-purpose CFD tool.

  Copyright (C) 1998-2020 EDF S.A.

  This program is free software; you can redistribute it and/or modify it under
  the terms of the GNU General Public License as published by the Free Software
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  This program is distributed in the hope that it will be useful, but WITHOUT
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  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
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  this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
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*/

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/*!
  \page cs_user_zones_examples  Volume and boundary zone definitions
  (cs_user_zones.c)

  Volume and boundary zones may be defined using the GUI, or through
  the \ref cs_user_zones (in cs_user_zones.c).

  \section cs_user_zones_volume_simple Simple volume zone example

  Most zones may be defined in a simple manner using the general
  \ref sec_selection_criteria "selection criteria", such as in the following
  example:

  \snippet cs_user_zones.c user_zones_head_loss_1

  \section cs_user_zones_volume_advanced Advanced volume zone example

  More complex selections can be done by defining an appropriate selection
  function. For example, to select cells adjacent to boundary faces belonging
  to a group named "G3", the following selection function must first be defined:

  \snippet cs_user_zones.c select_func_vol2

  It can then simply be used in a zone definition:

  \snippet cs_user_zones.c user_zones_volume_2

  \remark If defined as "static", as in this example, an with no function
          prototype, the selection function must be defined in the same file
          (i.e. cs_user_zones.c), and appear before the definition of
          \ref cs_user_zones. If a appropriate selection function is
          available in another source file, it must have non-static linkage
          an a function prototype must be provided (usually through an
          associated .h file).

*/
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