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[Functions] source/physics/Diffuse/Diffuse





  call Diffuse( integer(IN)           :: blockCount,
                integer(IN)           :: blockList(blockCount),
                real(IN)              :: dt,
                integer(IN), OPTIONAL :: pass)


      This routine advances the heat diffusion equation (i.e., heat conduction).
      Typically, implicit schemes will be used where available. 

      Currently, only support for advancing the heat diffusion equation
      (i.e., heat conduction) is available in Diffuse implementations.
      As of FLASH 3.3, a flux-based implementation in connection with
      a Hydro solver must be used for other diffusive effects, in particlular
      viscosity and magnetic resistivity.

      Supported boundary conditions are ??? and
      periodic (1).  The same boundary conditions are currently applied
      in all directions.


   blockCount   : The number of blocks in the list
   blockList(:) : The list of blocks on which the solution must be updated
   dt           : The time step
   pass         : Reverses the direction of solve in between half time steps
                  i.e X-Y-Z, Z-Y-X


  Updates certain variables in permanent UNK storage to contain the
  updated temperature and some auxiliaries.  Invokes a solver (of the Heat
  diffusion equation). On return,
     TEMP_VAR:  contains updated temperature for the current simulation time.
     EINT_VAR, ENER_VAR, PRES_VAR, etc.: updated accordingly by EOS call

  May modify certain variables used for intermediate results by the solvers
  invoked. The list of variables depends on the Diffuse implementation.
  The following information is subject to change.
     WTMP_VAR:  contains source term that was passed to Grid solver routines
     COND_VAR:  contains conductivity that was passed to Grid solver routines
     DTMP_VAR:  contains temperature increment for the current simulation time.
  For the Multigrid implementation:
     ISLS_VAR (residual)
     ICOR_VAR (correction)