Multi-grid Boundary issue

[adegroodt]

Hello WW3 community,

I have 2 uncertainties regarding the use of the grid and multi grid.

• First is, the relative importance of the "wavenumber shift" option in the grid.nml. I have read about it in the manual, and having run numerous runs with having it as a default "False", I was wondering if it make sense to run everything again by having it set as "True".

• this uncertainty of the wavenumber shift option arises because of my second issue. I am running a multi-grid simulation with a two-way nesting in Antarctica but at one of the boundaries (left) there is problem. Values coming from this boundaries appear to be created inside the smaller grid and not connected to the bigger grid (although the values do come from the bigger grid). By looking at the bigger grid, It seems that the values coming from outside of the smaller grid boundary do not follow to the smaller grid but are created inside of it...