add up3 advection scheme for momentum

Context

Add a ln_dynadv_up3 in namelist_ref and namelist_cfg for using a 3rd order upstream biased scheme to advect momentum in the flux form framework.

• Modifications of versioned files: Fortran routines (*.[Ffh]90), namelists (namelist\_*cfg)

It will replace ubs in the next nemo release.

Proposal

This scheme comes in addiction with former 2nd order centered (ln_dynadv_cen2) and upstream biased (ln_dynadv_ubs). It is based on dynadv_ubs.F90.

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Add dynadv_up3.F90

Horizontal advection

• remove the 4th order
• refactor the code accordingly

Vertical advection

• remove the 2nd order
• implement a 3rd order

Addition files to be updated

• dynadv.F90
• dynvor.F90
• namelist_ref
• namelist_cfg

changed milestone to %Tag 4.2.3

added DYN label

assigned to @techene

changed the description

created branch 275-add-up3-advection-scheme-for-momentum to address this issue

changed milestone to %NEMO 4.2 sunset

added to epic &4 (closed)

added FEATURE label

set weight to 1

mentioned in merge request !349 (merged)

closed