Support for orthogonal curvilinear grid?

Configurations Regional
1

Hi,

I don’t think, I’ve seen a setup yet for NEMO which is using orthongal conformal horizontal grid (see attached figure).
Does NEMO support if I created a conformal grid and its domain_cfg file manually.

I’ve seen the option for vector invariant form for momentum equations which gives me the idea that NEMO can support this type of grid.

Thanks in advance,
Best,
Mehmet

curvilinear_grid
curvilinear_grid534×550 11.3 KB

2

yes, see ORCA grid family for example,
You just have to provide the domain_cfg file with the proper scale factors.

3

Hi all,

I have another question related to the solution of curvilinear grids.I’ve created a curvilinear grid with variable resolution, and run the model with closed boundaries for 30 days with only atmospheric forcing.
I’ve attached a figure showing my domain;
Top left shows dx in the model, top right shows dy. Bottom left shows lon lat values every 10 points. The bottom right is the sst after 30 days, and the field clearly follows the high resolution grid in the domain. I will run a year to make sure this is not a equilibrium issue, but neverthless it is weird that the flow follows the dx (see sst lon 25.5 jet is stretching to west).

Any ideas or suggestions?

Thanks in advance,

Best,
Mehmet

image
image1615×860 205 KB

4

Hi.

Nice work. Did you rotate your wind, u and v component so that it follows your grid?

5

Actually I found my mistake somehow I’ve messed the dx,dys up. Now everything looks ok.
I don’t think I should need to rotate the winds, the model should do it automatically, I guess geo2ocn routine is for that. Although I need to be careful with velocities at the open boundaries.

Thanks,
Mehmet

6

NEMO will automatically rotate your winds if you provide a “rotation pairing” name in your namelist, so fldread can identify which input data must be rotated.
You have such an example in namsbc_blk for the variables sn_wndi and sn_wndj.