# \#BDY **URL:** https://nemo-ocean.discourse.group/tag/bdy/62.md [Latest](https://nemo-ocean.discourse.group/latest.md) · [Categories](https://nemo-ocean.discourse.group/categories.md) · [Tags](https://nemo-ocean.discourse.group/tags.md) --- ## [Structure of open boundaries](https://nemo-ocean.discourse.group/t/structure-of-open-boundaries/72)
**Author:** [@marilianemo](https://nemo-ocean.discourse.group/u/marilianemo)\ **Replies:** 29\ **Last updated:** [21 September 2026 08:57 UTC](https://nemo-ocean.discourse.group/t/structure-of-open-boundaries/72 "2026-09-21T08:57:06Z")
Dear all, I’m trying to run NEMOv4.0\_PISCES-v2 in an offline mode for a regional configuration. I have two open boundaries (W,E) and set then in namelist\_cfg as &nambdy\_index ! structured open boundaries definition … --- ## [Potential bug in NEMO4.2 and higher for fixed OBC+tides](https://nemo-ocean.discourse.group/t/potential-bug-in-nemo4-2-and-higher-for-fixed-obc-tides/853)
**Author:** [@dupontf](https://nemo-ocean.discourse.group/u/dupontf)\ **Replies:** 2\ **Last updated:** [28 February 2025 14:07 UTC](https://nemo-ocean.discourse.group/t/potential-bug-in-nemo4-2-and-higher-for-fixed-obc-tides/853 "2025-02-28T14:07:28Z")
Hi guys, I have found a strange behaviour in bdydta.F90 where tides are added indefinitely in the dta\_bdy structure if the dta\_bdy structure is not updated (i.e., fixed or no-temporal interpolation). I believe the same… --- ## [How to use unstructured open boundaries?](https://nemo-ocean.discourse.group/t/how-to-use-unstructured-open-boundaries/703)
**Author:** [@avelina](https://nemo-ocean.discourse.group/u/avelina)\ **Replies:** 2\ **Last updated:** [28 June 2024 08:46 UTC](https://nemo-ocean.discourse.group/t/how-to-use-unstructured-open-boundaries/703 "2024-06-28T08:46:18Z")
Hello! I’m having trouble using unstructured open boundaries without a coordinates.nc file in NEMO 4.2.2. I have a configuration that includes both ice and ocean modules. Despite reviewing previous discussions on BDY in… --- ## [BDY segments with NEMO4.2+](https://nemo-ocean.discourse.group/t/bdy-segments-with-nemo4-2/632)
**Author:** [@dupontf](https://nemo-ocean.discourse.group/u/dupontf)\ **Replies:** 7\ **Last updated:** [7 March 2024 16:38 UTC](https://nemo-ocean.discourse.group/t/bdy-segments-with-nemo4-2/632 "2024-03-07T16:38:51Z")
Hi all, I have a sort of philosophical question regarding the convention for BDY segments in NEMO4.2+. Reading the documentation (that mostly applies to global configurations) and the code, jpiglo is now calculated from… --- ## [Contrasting Behaviour in Reading bdydtav files between GNU and PGI Builds](https://nemo-ocean.discourse.group/t/contrasting-behaviour-in-reading-bdydtav-files-between-gnu-and-pgi-builds/565)
**Author:** [@nick.heavens-cgg](https://nemo-ocean.discourse.group/u/nick.heavens-cgg)\ **Replies:** 0\ **Last updated:** [2 October 2023 08:55 UTC](https://nemo-ocean.discourse.group/t/contrasting-behaviour-in-reading-bdydtav-files-between-gnu-and-pgi-builds/565 "2023-10-02T08:55:48Z")
I have been trying to build NEMO with the legacy Portland Group compilers (part of the Nvidia HPC SDK version 23.7). I found the issue three years ago documented in #2579 (PGI compiler does allow read values from namelis… --- ## [\[v4.2.x\] MPI error at open boundary](https://nemo-ocean.discourse.group/t/v4-2-x-mpi-error-at-open-boundary/131)
**Author:** [@amoulin](https://nemo-ocean.discourse.group/u/amoulin)\ **Replies:** 12\ **Last updated:** [8 November 2021 10:11 UTC](https://nemo-ocean.discourse.group/t/v4-2-x-mpi-error-at-open-boundary/131 "2021-11-08T10:11:15Z")
Dear all, The actual CMEMS Mediterranean sea configuration is running with NEMO v3.6 and we are now testing the 4.2\_RC. Simulations with closed boundaries are running but when we open the Atlantic boundaries several pro… --- ## [New regional configuration setup: open boundaries](https://nemo-ocean.discourse.group/t/new-regional-configuration-setup-open-boundaries/37)
**Author:** [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Replies:** 24\ **Last updated:** [21 October 2021 10:37 UTC](https://nemo-ocean.discourse.group/t/new-regional-configuration-setup-open-boundaries/37 "2021-10-21T10:37:29Z")
Dear all, I’m trying to set up a new regional configuration with open boundaries, using release 4.0.5. (Probably switching to 4.2\_RC as soon as available.) After quite some testing there are remaining questions, for wh…