# \#openifs-dynamics **URL:** https://forum.ecmwf.int/tag/openifs-dynamics/161.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [Recommendations for mass fixers in OpenIFS?](https://forum.ecmwf.int/t/recommendations-for-mass-fixers-in-openifs/12164)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 21\ **Last updated:** [8 May 2024 10:41 UTC](https://forum.ecmwf.int/t/recommendations-for-mass-fixers-in-openifs/12164 "2024-05-08T10:41:24Z")
Hi all I'm wondering about the mass fixers in OpenIFS. From reading Table 6 in https://www.ecmwf.int/sites/default/files/elibrary/2013/9055-global-mass-fixer-algorithms-conservative-tracer-transport-ecmwf-model.pdf it s… --- ## [Relaxation coefficients & smoothing](https://forum.ecmwf.int/t/relaxation-coefficients-smoothing/12199)
**Author:** [@Marcus\_Koehler](https://forum.ecmwf.int/u/Marcus_Koehler)\ **Replies:** 10\ **Last updated:** [7 March 2024 15:06 UTC](https://forum.ecmwf.int/t/relaxation-coefficients-smoothing/12199 "2024-03-07T15:06:10Z")
I'm running relaxation experiments in 43r3 following the namelist changes outlined at How to use OpenIFS in nudged configuration, and I'm trying to work out what the relaxation coefficients and smoothing parameters mean … --- ## [Difference between 10 year aquaplanet simulations](https://forum.ecmwf.int/t/difference-between-10-year-aquaplanet-simulations/12099)
**Author:** [@Thomas\_Batelaan](https://forum.ecmwf.int/u/Thomas_Batelaan)\ **Replies:** 2\ **Last updated:** [12 July 2023 06:26 UTC](https://forum.ecmwf.int/t/difference-between-10-year-aquaplanet-simulations/12099 "2023-07-12T06:26:15Z")
I have a question about a notable discrepancy observed in two 10-year aquaplanet simulations. The initialization files (ICMGG\INUA, ICMGG\INIT, ICMSH\INIT) and fort.4 used were the same. The only diffe… --- ## [Spectral nudging / relaxation code in OpenIFS](https://forum.ecmwf.int/t/spectral-nudging-relaxation-code-in-openifs/12182)
**Author:** [@Marcus\_Koehler](https://forum.ecmwf.int/u/Marcus_Koehler)\ **Replies:** 16\ **Last updated:** [11 November 2022 10:54 UTC](https://forum.ecmwf.int/t/spectral-nudging-relaxation-code-in-openifs/12182 "2022-11-11T10:54:35Z")
From: Helge Goessling Sent: 10 March 2021 12:07 Subject: Re: Spectral nuding / relaxation code in OpenIFS Dear Markus and Glenn, I am coming back to the question of spectral nudging with OpenIFS. In the meantime … --- ## [Spectral "wiggles" in 43r3?](https://forum.ecmwf.int/t/spectral-wiggles-in-43r3/12169)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 8\ **Last updated:** [27 September 2022 13:25 UTC](https://forum.ecmwf.int/t/spectral-wiggles-in-43r3/12169 "2022-09-27T13:25:20Z")
Good afternoon all I have set up a coupled configuration with OpenIFS 43r3 + NEMO and run a first year. After using CDO to convert the grib output to netCDF I see a lot of "wiggles" in the surface pressure. I did not se… --- ## [Baroclinic wave simulation in the idealised moist case](https://forum.ecmwf.int/t/baroclinic-wave-simulation-in-the-idealised-moist-case/12103)
**Author:** [@Clement\_Bouvier](https://forum.ecmwf.int/u/Clement_Bouvier)\ **Replies:** 1\ **Last updated:** [25 March 2022 13:41 UTC](https://forum.ecmwf.int/t/baroclinic-wave-simulation-in-the-idealised-moist-case/12103 "2022-03-25T13:41:32Z")
Hello everyone, I am trying to run the baroclinic wave case in OpenIFS. The default dry case works fine. It also works fine if I change the NTESTCASE from 41 (dry) to 42 (moist). However, in both of these cases the ph… --- ## [Adding localized temperature perturbation](https://forum.ecmwf.int/t/adding-localized-temperature-perturbation/12183)
**Author:** [@Sandor\_Maho](https://forum.ecmwf.int/u/Sandor_Maho)\ **Replies:** 4\ **Last updated:** [11 March 2022 10:26 UTC](https://forum.ecmwf.int/t/adding-localized-temperature-perturbation/12183 "2022-03-11T10:26:20Z")
Hello, I am working with OpenIFS CY43R3 in its aqua planet configuration and trying to add a stationary localized heat perturbation which would mimick convective heating in the tropical mid-troposphere. My intention is… --- ## [Nudging to reanalysis / operational analysis](https://forum.ecmwf.int/t/nudging-to-reanalysis-operational-analysis/12188)
**Author:** [@Victoria\_Sinclair](https://forum.ecmwf.int/u/Victoria_Sinclair)\ **Replies:** 12\ **Last updated:** [7 December 2020 12:16 UTC](https://forum.ecmwf.int/t/nudging-to-reanalysis-operational-analysis/12188 "2020-12-07T12:16:50Z")
We are interested at looking at the impact of sudden stratospheric warmings on the troposphere. We are wondering if there is a nudging capacity in OpenIFS so that we could force the stratosphere to be "correct" (i.e. nu… --- ## [Use Euler dynamics instead of semi-Langrangian](https://forum.ecmwf.int/t/use-euler-dynamics-instead-of-semi-langrangian/12179)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 1\ **Last updated:** [31 October 2018 19:11 UTC](https://forum.ecmwf.int/t/use-euler-dynamics-instead-of-semi-langrangian/12179 "2018-10-31T19:11:18Z")
Hi, I want to use the older Euler dynamics in OpenIFS for some testing rather than the semi-Lagrangian scheme. What namelist settings and other changes do I need to make to the model? Thanks, RH. --- ## [Aquaplanet simulations](https://forum.ecmwf.int/t/aquaplanet-simulations/12142)
**Author:** [@Victoria\_Sinclair](https://forum.ecmwf.int/u/Victoria_Sinclair)\ **Replies:** 3\ **Last updated:** [26 March 2018 13:37 UTC](https://forum.ecmwf.int/t/aquaplanet-simulations/12142 "2018-03-26T13:37:52Z")
What initial conditions files should be used for an aqua-planet simulation? Is it possible to start with a set of standard OpenIFS initial conditions? Also how easy would it be to specifiy a highly idealised basic state … --- ## [Wind explosion](https://forum.ecmwf.int/t/wind-explosion/12109)
**Author:** [@Marston\_Ward](https://forum.ecmwf.int/u/Marston_Ward)\ **Replies:** 4\ **Last updated:** [11 September 2017 12:31 UTC](https://forum.ecmwf.int/t/wind-explosion/12109 "2017-09-11T12:31:06Z")
POINT= 14 MAX ETADOT VERTICAL VEL.= 3.671716816008357E-006 LON = 136.000000000000 degrees LAT = 81.0519404509364 degrees MAX V WIND= 298.250361785114 MAX U WIND= 550.8368831848…