FLASH4.5 API

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[Functions] source/physics/Diffuse/Diffuse_advance1D

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NAME

  Diffuse_advance1D

SYNOPSIS

  call Diffuse_advance1D(integer(IN)            :: nx,
                         integer(IN)            :: ny,
                         integer(IN)            :: nz,
                         integer(IN)            :: idirection,
                         integer(IN)            :: bctype(2),
                         real(IN)               :: del,
                         real(IN)               :: dt,
                         real(IN)               :: theta,
                         real(IN)               :: chi,
                         real(IN)               :: cond(nx,ny,nz),
                         real(INOUT)            :: soln(nx,ny,nz),
                         logical(IN)            :: useCFArray,
                         real,OPTIONAL, pointer :: ConstFact(:,:,:))

DESCRIPTION

  Subroutine to advance Diffusion in one dimension.

  This routine advances a diffusive operator (think heat conduction) in time.

  Generic form of the equation a*dV/dt = d/dx(b*dV/dx) + d/dy(b*dV/dy) + d/dz(b*dV/dz)
                               i.e for Heat conduction, a=rho*Cv, b=conductivity and V=Temp

ARGUMENTS

   nx         : Total grid points along x-direction.

   ny         : Total grid points along y-direction.

   nz         : Total grid points along z-direction.

   idirection : Direction of solve 

   bctype     : Left and Right boundary condition type.
                Supports PERIODIC, OUTFLOW (tested).
                         DIRICHLET,PNEUMAN (untested).

   del        : dx,dy or dz based on direction of solve

   dt         : timestep.

   theta      : 0.5 CN Scheme, 1.0 Fully Implicit, 0.0 Explicit

   chi        : Diffusion coefficient, not used anymore.

   cond       : Spatial Conductivity variation (K)

   soln       : discretised  variation  of variable to be diffused (input). On Output contains the diffused solution.

   useCFArray : Flag to determine if we have ConstFact(:,:,:)

   ConstFact  : Spatial distributio of a factor (think rho*cv in heat conduction). !!

SEE ALSO

  Grid_advanceDiffusion
  Diffuse

NOTES

  This public API subroutine is so far used only from
  the pencil grid implementation of Grid_advanceDiffusion.
  The pencil grid implementation of Grid_advanceDiffusion, in turn,
  is currently only used by the Split implementation of the DiffuseMain
  subunit.