#1742 closed Bug (fixed)
BUG in TVD (FCT) with vvl (non linear free surface) in v3.6_stable (trunk)
| Reported by: | gm | Owned by: | nemo |
|---|---|---|---|
| Priority: | normal | Milestone: | 2016 WP |
| Component: | OCE | Version: | v3.6 |
| Severity: | Keywords: | FCT OPA TVD VVL v3.6 | |
| Cc: |
Description
Context
The flux corrected advection scheme of tracer (TVD for v3.6_stable, FCT for the trunk) does not prevent the creation of false extrema when using time varying level thickness (key_vvl defined for v3.6, ln_linssh=false for the trunk).
Analysis
In traadv_tvd.F90 (traadv_FCT.F90 for the trunk) the time integration of the low order scheme does not take into account the change in level thickness. As a result, the anti-diffusive correction is improperly evaluated when a time varying vertical coordinate is use.
Fix
v3.6_stable :
in traadv_tvd.F90, line 182:
zwi(ji,jj,jk) = ( ptb(ji,jj,jk,jn) + z2dtt * ztra ) * tmask(ji,jj,jk)
should be replaced by
zwi(ji,jj,jk) = ( fse3t_b(ji,jj,jk)*ptb(ji,jj,jk,jn) + z2dtt * fse3t_n(ji,jj,jk)*ztra ) / fse3t_a(ji,jj,jk) * tmask(ji,jj,jk)
trunk :
in traadv_fct.F90, line 158:
zwi(ji,jj,jk) = ( ptb(ji,jj,jk,jn) + p2dt * ztra ) * tmask(ji,jj,jk)
should be replaced by
zwi(ji,jj,jk) = ( e3t_b(ji,jj,jk)*ptb(ji,jj,jk,jn) + z2dtt * e3t_n(ji,jj,jk) * ztra ) / e3t_a(ji,jj,jk) * tmask(ji,jj,jk)
Gurvan and Simona
Commit History (4)
| Changeset | Author | Time | ChangeLog |
|---|---|---|---|
| 6706 | huwlewis | 2016-06-14T12:49:06+02:00 | Commit simple mask scaling for sent SST field for #1742 |
| 6705 | huwlewis | 2016-06-14T12:45:08+02:00 | Create a branch for #1742 land/sea sst mask in sent field |
| 6692 | flavoni | 2016-06-13T16:39:24+02:00 | #1742, commit correction on advection scheme TVD |
| 6691 | flavoni | 2016-06-13T16:37:49+02:00 | #1742, commit correction on advection scheme FCT |
Change History (7)
comment:1 Changed 7 years ago by flavoni
comment:2 Changed 7 years ago by flavoni
- Resolution set to fixed
- Status changed from new to closed
comment:3 Changed 7 years ago by nicolasmartin
- Keywords VVL added; vvl removed
comment:4 Changed 7 years ago by nicolasmartin
- Keywords nemo_v3_6* added
comment:5 Changed 6 years ago by nemo
- Keywords release-3.6* added; nemo_v3_6* removed
comment:6 Changed 6 years ago by nemo
- Keywords release-3.6* removed
comment:7 Changed 22 months ago by nemo
- Keywords OPA v3.6 added
Bug seen via implementation of Lock Exchange test case, with vvl (in both trunk and in version 3.6_stable) there was extrema of temperature.
For 36stable committed correction, see revision 6692
For trunk committed correction, see revision 6691