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[Functions] source/physics/Gravity/Gravity_accelOneRow





  call Gravity_accelOneRow(integer(IN)  :: pos(2),
                           integer(IN)  :: sweepDir,
                           integer(IN)  :: blockID,
                           integer(IN)  :: numCells,
                           real(INOUT)  :: grav(numCells),
                           integer(IN),optional :: potentialIndex,
                           integer(IN),optional :: extraAccelVars(MDIM))


  This routine computes the gravitational acceleration for a row
  of cells in a specified direction in a given block.


  pos      :  Row indices transverse to the sweep direction
  sweepDir :    The sweep direction:  allowed values are 
              SWEEP_X, SWEEP_Y, and SWEEP_Z. These values are defined
              in constants.h.
  blockID  :  The local identifier of the block to work on
  numCells :  Number of cells to update in grav()
  grav()   :   Array to receive result
  potentialIndex :   Variable # to take as potential if present
                    ( this argument is applicable only in self-gravity
                      formulated as Poisson's equation)
  extraAccelVars      -  if specified,  Variables from which extra accelerations
                         are taken. Used to identify the UNK variables
                         that contain sink-on-gas accelerations when
                         sink particles are used.


  The following applies to Gravity implementations which solve the
  Poisson problem for self-gravity:
  If certain variables declared by the sink particles inplementation are
  declared, it is assumed that sink particles are in use.
  The sets of variables to make this determination are
    o  those given by extraAccelVars   extraAccelVars if present;
    o  {SGXO_VAR, SGYO_VAR, SGZO_VAR}  if potentialIndex is GPOL_VAR;
    o  {SGAX_VAR, SGAY_VAR, SGAZ_VAR}  otherwise.
  If it is assumed that sink particles are in use, then the acceleration
  returned in the grav array will have the appropriate sink particle
  acceleration component added to the acceleration computed by differencing
  the potential variable given by potentialIndex.