Thanks for sending this. I was unaware of the bug - but I am using COAWST v3.8, which has ROMS 4.1. I will need to see how difficult it is to git cherry pick the commit and deal with merge conflicts.
That said, I don't think GLS is overmixing in this case (recall I paired it with harmonic lateral ...
Search found 6 matches
- Tue Mar 25, 2025 5:46 pm
- Forum: ROMS Discussion
- Topic: LMD/KPP performance in river plume simulations
- Replies: 3
- Views: 5788
- Sun Mar 23, 2025 8:09 pm
- Forum: ROMS Discussion
- Topic: LMD/KPP performance in river plume simulations
- Replies: 3
- Views: 5788
Re: LMD/KPP performance in river plume simulations
Just for an update, I found significant improvement with Richardson number smoothing paired with biharmonic mixing. See attached for a vorticity comparison with the same GLS simulation (that uses harmonic).
kpp_w_biharmonic_RI_smooth.png
RI_HORAVG Smooth Richardson number horizontally
RI ...
kpp_w_biharmonic_RI_smooth.png
RI_HORAVG Smooth Richardson number horizontally
RI ...
- Fri Mar 21, 2025 3:51 pm
- Forum: ROMS Discussion
- Topic: LMD/KPP performance in river plume simulations
- Replies: 3
- Views: 5788
LMD/KPP performance in river plume simulations
Hi All,
I'm doing a model-model comparison of the Texas-Louisiana shelf with ROMS and MPAS-O. Our ROMS model is validated (Hetland 2017 JPO, Kobashi & Hetland 2020 OD) and normally uses k-omega or k-epsilon for vertical mixing with great success. The mean resolution is ~1.5 km. 30 vertical layers ...
I'm doing a model-model comparison of the Texas-Louisiana shelf with ROMS and MPAS-O. Our ROMS model is validated (Hetland 2017 JPO, Kobashi & Hetland 2020 OD) and normally uses k-omega or k-epsilon for vertical mixing with great success. The mean resolution is ~1.5 km. 30 vertical layers ...
- Thu May 23, 2024 3:49 pm
- Forum: ROMS Discussion
- Topic: Question about Smagorinsky mixing coefficients
- Replies: 0
- Views: 9449
Question about Smagorinsky mixing coefficients
Hi All,
I'm doing some experiments with Smagorinsky viscosity/diffusion applied biharmonically along geopotential surfaces to explore its impacts on numerical mixing. In hmixing.F, I see that Bsmag is controlled by PecletCoef, which is equal to 1/12. Where does the 1/12 come from? It's unclear to ...
I'm doing some experiments with Smagorinsky viscosity/diffusion applied biharmonically along geopotential surfaces to explore its impacts on numerical mixing. In hmixing.F, I see that Bsmag is controlled by PecletCoef, which is equal to 1/12. Where does the 1/12 come from? It's unclear to ...
- Tue Jul 25, 2023 7:43 pm
- Forum: ROMS Discussion
- Topic: DIAGNOSTICS_TS in step3d_t
- Replies: 3
- Views: 7753
Re: DIAGNOSTICS_TS in step3d_t
A little late, but I believe you're correct. Parker MacCready posted a thread about this about a decade ago, it gets at this issue as well. Took me too long to figure out myself until I discovered that thread, posting this to help aggregate.
I figured out the problem with my salt_rate test. salt ...
I figured out the problem with my salt_rate test. salt ...
- Tue Jul 25, 2023 7:20 pm
- Forum: ROMS Discussion
- Topic: Calculate tracer vertical diffusion coefficients offline?
- Replies: 0
- Views: 8793
Calculate tracer vertical diffusion coefficients offline?
Is it possible to calculate the vertical tracer diffusion coefficients "AKt" or "AKs" offline with model output? I'm using the GLS k-epsilon vertical mixing scheme for context and would appreciate if there's a way to compute them using the model equations.
I'd like to construct an offline ...
I'd like to construct an offline ...