#2479 closed Bug (fixed)

Inconsistent time scale in aEVP rheology

Reported by: jchanut Owned by: systeam
Priority: high Milestone:
Component: SI3 Version: 4.0-HEAD
Severity: major Keywords:
Cc: Branch review: failed
MP ready?: no Task progress: Unspecified

Description

The adaptive rheology solver (ln_aEVP=T) is based on the modified EVP solver of Bouillon et al (2013) in which time stepping of rheology is replaced by an iterative process. In that context the time scale involved in the equations is the "slow" ice time step, "rdt_ice", in contrary to the standard EVP method which considers the substep "rdt_ice/nn_nevp".

NEMO makes no disctinction so that the time stepping, varying alpha/beta coefficients are all wrong. Replacing "zdtevp" by "rdt_ice" at the beginning of the rheology subroutine ("ice_dyn_rhg_evp") solves the problem.

There are potentially other, but minor, inconsistencies related to aEVP such that the missing spatial interpolation of alpha/beta at velocity points.

Commit History (1)

ChangesetAuthorTimeChangeLog
13064clem2020-06-08T15:43:28+02:00

fix ticket #2479. This was a major bug preventing aEVP to work as it should. + Add output of beta

Change History (2)

comment:1 Changed 12 months ago by clem

In 13064:

fix ticket #2479. This was a major bug preventing aEVP to work as it should. + Add output of beta

comment:2 Changed 12 months ago by clem

  • Resolution set to fixed
  • Status changed from new to closed
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