#2265 closed Defect (fixed)
Misleading minimum viscosity with Smagorinsky scheme ?
| Reported by: | jchanut | Owned by: | gm |
|---|---|---|---|
| Priority: | low | Milestone: | |
| Component: | LDF | Version: | v4.0 |
| Severity: | minor | Keywords: | v4.0 |
| Cc: |
Description (last modified by nicolasmartin)
Context
From ldfdyn.F90, the Laplacian Smagorinsky scheme (formula 32) scales the viscosity minimum with the local velocity speed (U) such that:
A = MAX(Asmag, rn_minfac * U * dx / SQRT(4.) )
With the default namelist value rn_minfac=1., it is therefore assumed a Reynolds number (Re) that equals 2., a pretty low value that leads to values well above what gives the Smagorinsky scheme with a standard coefficient. One would have expected a Reynolds number that matches what is used with formula (31), i.e. Re=12 or... alternatively a default value rn_minfac=0.16.
Was this done on purpose ? Did I missed something ?
Commit History (2)
| Changeset | Author | Time | ChangeLog |
|---|---|---|---|
| 12201 | smasson | 2019-12-12T09:51:33+01:00 | |
| 12194 | smasson | 2019-12-11T17:21:56+01:00 | trunk: minor bugfix in ldfdyn, see #2265 |
Change History (6)
comment:1 Changed 5 years ago by nicolasmartin
- Description modified (diff)
comment:2 Changed 5 years ago by clevy
- Owner changed from systeam to gm
- Status changed from new to assigned
comment:3 Changed 5 years ago by smasson
comment:4 Changed 5 years ago by smasson
- Resolution set to fixed
- Status changed from assigned to closed
comment:5 Changed 5 years ago by smasson
In 12201:
comment:6 Changed 2 years ago by nemo
- Keywords v4.0 added
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In 12194: