NAME
Grid_dfsvBeginSystem
SYNOPSIS
call Grid_dfsvBeginSystem(
integer(IN), dimension(VARDESC_SIZE) :: baseVarDesc,
integer(IN) :: ntotVars,
OPTIONAL,integer(IN) :: pass)
DESCRIPTION
This routine advances a generalized diffusion operator of the form
A*(df/dt) + C*f = div(B*grad(f)) + D ,
where
f = f(x,t) is the Variable to be diffused (x=1D..3D position);
Presently it is used to do heat conduction and multigroup diffusion.
ARGUMENTS
baseVarDesc : A variable on which the diffusion operation is performed, usually
an extra variable, used to identify the system
ntotVars : total number or variables to solve for / equations to solve
SIDE EFFECTS
NOTES
This implementation
* supports:
1D, 2D PARAMESH (with local refinement)
1D, 2D, 3D in UG (3D untested).
1D Spherical in PARAMESH/UG
1D, 2D Cylindrical in PARAMESH/UG (R-Z)
* uses HYPRE library to solve AX = B