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Limit the saturation vapor pressure e_s used in the Kessler microphysics#1452

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mgduda merged 1 commit into
MPAS-Dev:hotfix-v8.4.1from
skamaroc:kessler_high_top_fix
Jun 5, 2026
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Limit the saturation vapor pressure e_s used in the Kessler microphysics#1452
mgduda merged 1 commit into
MPAS-Dev:hotfix-v8.4.1from
skamaroc:kessler_high_top_fix

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@skamaroc skamaroc commented May 7, 2026

This PR limits the saturation vapor pressure, e_s, used in the Kessler microphysics to a value at or below 99% of the full pressure. In the previous version of Kessler the saturation vapor pressure formula could produce unphysically large values of e_s at very low pressures (high model top) and cause the model to blow up.

@mgduda mgduda added the bug fix label May 20, 2026
@mgduda mgduda changed the base branch from develop to hotfix-v8.4.1 June 4, 2026 22:52
@mgduda mgduda changed the title This commit limits the saturation vapor pressure e_s used in the Limit the saturation vapor pressure e_s used in the Kessler microphysics Jun 5, 2026
This commit limits the saturation vapor pressure e_s used in the Kessler
microphysics to a value at or below 99% of the full pressure. In the previous
version of Kessler the saturation vapor pressure formula could produce
unphysically large values of e_s at very low pressures (high model top) and
cause the model to blow up.
@mgduda mgduda force-pushed the kessler_high_top_fix branch from 61cb7a0 to 95d33cd Compare June 5, 2026 22:20
@mgduda mgduda merged commit c0a314b into MPAS-Dev:hotfix-v8.4.1 Jun 5, 2026
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3 participants