+Add RESCALE_STRONG_DRAG#962
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Hallberg-NOAA merged 1 commit intoSep 9, 2025
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Sep 9, 2025
Added the new runtime option RESCALE_STRONG_DRAG, that can be set to true to reduce the barotropic contribution to the layer accelerations to account for the difference between the forces that can be counteracted by the stronger drag with BT_STRONG_DRAG and the average of the layer viscous remnants after a baroclinic timestep. In testing, this new capability eliminates some of the growing instabilities that can occur with an ice shelf and BT_STRONG_DRAG set to true. This commit also adds new diagnostics of the barotropic step viscous remnants and the eta anomalies contributing to barotropic pressure forces, either averaged over the barotropic step or at each barotropic step. By default all answers are bitwise identical, but there is a new runtime parameter and 4 new diagnostics.
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This PR has passed pipeline testing at https://gitlab.gfdl.noaa.gov/ogrp/mom6ci/MOM6/-/pipelines/28774 with the expected warnings about new runtime parameters and diagnostics. |
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Added the new runtime option
RESCALE_STRONG_DRAG, that can be set to true to reduce the barotropic contribution to the layer accelerations to account for the difference between the forces that can be counteracted by the stronger drag withBT_STRONG_DRAGand the average of the layer viscous remnants after a baroclinic timestep. In testing, this new capability eliminates some of the growing instabilities that can occur with an ice shelf andBT_STRONG_DRAGset to true. This commit also adds new diagnostics of the barotropic step viscous remnants and the eta anomalies contributing to barotropic pressure forces, either averaged over the barotropic step or at each barotropic step. By default all answers are bitwise identical, but there is a new runtime parameter and 4 new diagnostics.