Evaluate 2nd partial derivatives in each coordinate direction according to equations (2.2) & (2.4) in
Sundqvist & Veronis (1969) "A simple finite-difference grid with non-constant intervals", Tellus 22:1
compute scalar flux divergence at internal points and boundary points excluding x-direction boundaries
(dx_b + dx_f)/2
forward flux in x direction
backward flux in x direction
forward flux in y direction
backward flux in y direction
forward flux in z direction
backward flux in z direction
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Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module. Where possible, edges connecting nodes are given different colours to make them easier to distinguish in large graphs.