Skilled (#3) - [LIM3] Question about diffusion operator (#13) - Message List
Dear NEMO/LIM developers
I would like to have some explanation about diffusion operator in LIM3, and the way it is calculated
I cannot figure out what equations is actually solved in lim_hdf routine.
the advection/diffusion equation for a generic ice component is something the like ( apart from scale factors and other terms in the equation):
d X d t = - div ( X . u ) + D laplacian ( X ).
as far as I understood, first transport is solved, namely
d X / d t = - div ( X . u )
leading to a value of X at next time step, X(n+1)
then the diffusion is added,
X(n+1) =X(n+1) + D laplacian ( X(n+1) )
where X(n+1) Is a known quantity. So I cannot figure out why an iterative method
The question is, what am I missing?