# \#ogs6

**URL:** https://discourse.opengeosys.org/tag/ogs6/5.md

[Latest](https://discourse.opengeosys.org/latest.md) · [Categories](https://discourse.opengeosys.org/categories.md) · [Tags](https://discourse.opengeosys.org/tags.md)

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## [Simulation time dependet on mesh structure](https://discourse.opengeosys.org/t/simulation-time-dependet-on-mesh-structure/2053)

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**Author:** [@Kim.Nie](https://discourse.opengeosys.org/u/Kim.Nie)\
**Replies:** 1\
**Last updated:** [October 2, 2026, 7:21am UTC](https://discourse.opengeosys.org/t/simulation-time-dependet-on-mesh-structure/2053 "2026-10-02T07:21:28Z")

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Dear OGS Community, while using and experimenting with different mesh types, I noticed that the simulation time increases significantly for quad meshes and slices (extruded 2D triangular meshes) compared to tetrahedral …

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## [OpenGeoSys 6.5.9 released!](https://discourse.opengeosys.org/t/opengeosys-6-5-9-released/2042)

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**Author:** [@bilke](https://discourse.opengeosys.org/u/bilke)\
**Replies:** 0\
**Last updated:** [September 18, 2026, 11:42am UTC](https://discourse.opengeosys.org/t/opengeosys-6-5-9-released/2042 "2026-09-18T11:42:38Z")

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We are happy to announce the release of OpenGeoSys 6.5.9! Links Release page on www.opengeosys.org GitLab Release Zenodo Release PyPI Release Also available on Conda and Guix Highlights Process’ changes TH2M !5784 …

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## [OGSTools 0.8.2 released!](https://discourse.opengeosys.org/t/ogstools-0-8-2-released/2040)

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**Author:** [@TobiasMeisel](https://discourse.opengeosys.org/u/TobiasMeisel)\
**Replies:** 0\
**Last updated:** [September 3, 2026, 9:05am UTC](https://discourse.opengeosys.org/t/ogstools-0-8-2-released/2040 "2026-09-03T09:05:09Z")

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We are happy to announce the release of OGSTools 0.8.2! Links PyPI release Documentation Source code repository Zenodo Release OGSTools 0.8.2 Release Notes Python 3.12-3.14 OGS 6.5.8 3rd of September 2026 Breaking…

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## [Questions about discretization artefacts in OGS 6.5.7–Phreeqc coupling](https://discourse.opengeosys.org/t/questions-about-discretization-artefacts-in-ogs-6-5-7-phreeqc-coupling/2036)

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**Author:** [@Haruki\_Ishii](https://discourse.opengeosys.org/u/Haruki_Ishii)\
**Replies:** 4\
**Last updated:** [September 1, 2026, 2:56am UTC](https://discourse.opengeosys.org/t/questions-about-discretization-artefacts-in-ogs-6-5-7-phreeqc-coupling/2036 "2026-09-01T02:56:15Z")

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Dear OGS developers and users, We are investigating reactive transport with the officially distributed OGS 6.5.7 binary. Our project uses ComponentTransport and selects the chemistry interface as follows:\<chemical\_syste…

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## [\`pip install ogs\` fails on arm-based MacOS for v6.5.7 and v6.5.8](https://discourse.opengeosys.org/t/pip-install-ogs-fails-on-arm-based-macos-for-v6-5-7-and-v6-5-8/2037)

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**Author:** [@thealanjason](https://discourse.opengeosys.org/u/thealanjason)\
**Replies:** 2\
**Last updated:** [August 24, 2026, 2:40pm UTC](https://discourse.opengeosys.org/t/pip-install-ogs-fails-on-arm-based-macos-for-v6-5-7-and-v6-5-8/2037 "2026-08-24T14:40:19Z")

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We cannot install OGS using pip install ogs on arm-based MacOS computers. The error is due to an unset CPM\_SOURCE\_CACHE variable. Please see the error message below: CMake Error at scripts/cmake/Dependencies.cmake:196…

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## [OGSTools 0.8.1 released!](https://discourse.opengeosys.org/t/ogstools-0-8-1-released/1858)

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**Author:** [@TobiasMeisel](https://discourse.opengeosys.org/u/TobiasMeisel)\
**Replies:** 0\
**Last updated:** [June 2, 2026, 8:22am UTC](https://discourse.opengeosys.org/t/ogstools-0-8-1-released/1858 "2026-06-02T08:22:43Z")

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We are happy to announce the release of OGSTools 0.8.1! Links PyPI release Documentation Source code repository Zenodo Release OGSTools 0.8.1 Release Notes Python 3.12-3.14 OGS 6.5.8 1/June/2026 Changes (non API-…

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## [5th OGS Hackathon (1 June 2026, Leipzig – UFZ VisLab & Online)](https://discourse.opengeosys.org/t/5th-ogs-hackathon-1-june-2026-leipzig-ufz-vislab-online/1850)

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**Author:** [@TobiasMeisel](https://discourse.opengeosys.org/u/TobiasMeisel)\
**Replies:** 1\
**Last updated:** [May 29, 2026, 9:32am UTC](https://discourse.opengeosys.org/t/5th-ogs-hackathon-1-june-2026-leipzig-ufz-vislab-online/1850 "2026-05-29T09:32:08Z")

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Save the Date: OGS Hackathon: 01/June/2026 :spiral\_calendar: Date: 1 June 2026, 10:00 a.m. - 3:00 p.m. (UTC+1) (with 1 hour lunch break around noon) :round\_pushpin: Location: Leipzig, UFZ, VisLab (online participation i…

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## [OpenGeoSys User Training: Small series starting on 21st of November](https://discourse.opengeosys.org/t/opengeosys-user-training-small-series-starting-on-21st-of-november/1719)

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**Author:** [@TobiasMeisel](https://discourse.opengeosys.org/u/TobiasMeisel)\
**Replies:** 21\
**Last updated:** [April 29, 2026, 5:30am UTC](https://discourse.opengeosys.org/t/opengeosys-user-training-small-series-starting-on-21st-of-november/1719 "2026-04-29T05:30:52Z")

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Update 2025/12/18: On request in our 4th session we will give a short overview to OGSTools Update 2025/12/05: Cloudflare is down for scheduled maintenance until 1pm UTC0. So Zoom is not working. We will postpone to next…

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## [75 Elments found with wrong node order in the .vtu file converted by the .msh file using GMSH2OGS](https://discourse.opengeosys.org/t/75-elments-found-with-wrong-node-order-in-the-vtu-file-converted-by-the-msh-file-using-gmsh2ogs/1849)

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**Author:** [@wugao](https://discourse.opengeosys.org/u/wugao)\
**Replies:** 2\
**Last updated:** [April 21, 2026, 3:05am UTC](https://discourse.opengeosys.org/t/75-elments-found-with-wrong-node-order-in-the-vtu-file-converted-by-the-msh-file-using-gmsh2ogs/1849 "2026-04-21T03:05:50Z")

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Hi everyone, I have encountered some problems using Gmsh for preprocessing. First, I used Gmsh to generate a PJ.geo file, and then exported the corresponding PJ.msh file (Version 2 ASCII format). Afterwards, I success…

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## [Issues on timestep sensitivity and output variables in reactive transport](https://discourse.opengeosys.org/t/issues-on-timestep-sensitivity-and-output-variables-in-reactive-transport/1846)

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**Author:** [@KFC\_forever](https://discourse.opengeosys.org/u/KFC_forever)\
**Replies:** 0\
**Last updated:** [April 8, 2026, 5:08am UTC](https://discourse.opengeosys.org/t/issues-on-timestep-sensitivity-and-output-variables-in-reactive-transport/1846 "2026-04-08T05:08:41Z")

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Hello everyone, I am currently reproducing the benchmark Transport and Cation Exchange with the original .prj file (no modifications). I encountered two issues and would greatly appreciate any insights: 1. Timestep se…

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## [OGSTools 0.8.0 released!](https://discourse.opengeosys.org/t/ogstools-0-8-0-released/1842)

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**Author:** [@TobiasMeisel](https://discourse.opengeosys.org/u/TobiasMeisel)\
**Replies:** 0\
**Last updated:** [March 23, 2026, 3:11pm UTC](https://discourse.opengeosys.org/t/ogstools-0-8-0-released/1842 "2026-03-23T15:11:07Z")

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We are happy to announce the release of OGSTools 0.8.0! Links PyPI release Documentation Source code repository Zenodo Release OGSTools 0.8.0 Release Notes Python 3.11-3.14 OGS 6.5.7 Breaking changes API breakin…

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## [Two-phase flow question](https://discourse.opengeosys.org/t/two-phase-flow-question/1829)

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**Author:** [@Seojeonwon](https://discourse.opengeosys.org/u/Seojeonwon)\
**Replies:** 0\
**Last updated:** [March 7, 2026, 5:56am UTC](https://discourse.opengeosys.org/t/two-phase-flow-question/1829 "2026-03-07T05:56:16Z")

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Hello, I am a student currently studying at Kangwon National University in Korea. I am working on a two-way coupling study where I first solve a two-phase flow problem, then compute pore pressure from the results, calc…

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## [Liakopoulos TH2M/H2M benchmark: mismatch with Grunwald et al. (2022) Fig. 9 (vertical displacement profile)](https://discourse.opengeosys.org/t/liakopoulos-th2m-h2m-benchmark-mismatch-with-grunwald-et-al-2022-fig-9-vertical-displacement-profile/1807)

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**Author:** [@dbcavalcanti](https://discourse.opengeosys.org/u/dbcavalcanti)\
**Replies:** 1\
**Last updated:** [February 19, 2026, 8:10am UTC](https://discourse.opengeosys.org/t/liakopoulos-th2m-h2m-benchmark-mismatch-with-grunwald-et-al-2022-fig-9-vertical-displacement-profile/1807 "2026-02-19T08:10:00Z")

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I’m comparing Fig. 9 in Grunwald et al. (2022) (Liakopoulos test) with the results shown in the OGS benchmark notebook/page for the Liakopoulos case. In particular, the vertical displacement profile differs noticeably: …

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## [Error: The found parameter is not suitable for the use on the required mesh](https://discourse.opengeosys.org/t/error-the-found-parameter-is-not-suitable-for-the-use-on-the-required-mesh/1769)

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**Author:** [@fvehling](https://discourse.opengeosys.org/u/fvehling)\
**Replies:** 3\
**Last updated:** [January 21, 2026, 3:49pm UTC](https://discourse.opengeosys.org/t/error-the-found-parameter-is-not-suitable-for-the-use-on-the-required-mesh/1769 "2026-01-21T15:49:20Z")

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I have following problem: "error: The found parameter is not suitable for the use on the required mesh. The parameter’s domain of definition mesh ‘initial\_condition’ differs from the used mesh ‘top\_cigar\_lake’. The sam…

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## [Why my terminal is saying "this app cannot run on your pc","to find a version for your pc,check with the software publisher"](https://discourse.opengeosys.org/t/why-my-terminal-is-saying-this-app-cannot-run-on-your-pc-to-find-a-version-for-your-pc-check-with-the-software-publisher/1798)

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**Author:** [@Anilvankudoth](https://discourse.opengeosys.org/u/Anilvankudoth)\
**Replies:** 2\
**Last updated:** [January 18, 2026, 3:57pm UTC](https://discourse.opengeosys.org/t/why-my-terminal-is-saying-this-app-cannot-run-on-your-pc-to-find-a-version-for-your-pc-check-with-the-software-publisher/1798 "2026-01-18T15:57:22Z")

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why my terminal is saying “this app cannot run on your pc”,“to find a version for your pc,check with the software publisher”.please help me regarding this issue.

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## [Feasibility of Multiphase Flow with PHREEQC as Chemical Solver](https://discourse.opengeosys.org/t/feasibility-of-multiphase-flow-with-phreeqc-as-chemical-solver/1775)

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**Author:** [@Jalil](https://discourse.opengeosys.org/u/Jalil)\
**Replies:** 0\
**Last updated:** [December 10, 2025, 4:29pm UTC](https://discourse.opengeosys.org/t/feasibility-of-multiphase-flow-with-phreeqc-as-chemical-solver/1775 "2025-12-10T16:29:14Z")

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I am new to OGS and trying to determine whether the workflow I have in mind is supported before investing more time into the software. I want to simulate two-phase flow in a porous medium (supercritical CO2 injection in…

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## [How to simulate CO₂ dissolution into pore water with a 2D mesh in OGS?](https://discourse.opengeosys.org/t/how-to-simulate-co-dissolution-into-pore-water-with-a-2d-mesh-in-ogs/1730)

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**Author:** [@RG001](https://discourse.opengeosys.org/u/RG001)\
**Replies:** 3\
**Last updated:** [November 21, 2025, 8:31am UTC](https://discourse.opengeosys.org/t/how-to-simulate-co-dissolution-into-pore-water-with-a-2d-mesh-in-ogs/1730 "2025-11-21T08:31:05Z")

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Hi OGS team, I would like to simulate the process of CO₂ dissolving into pore water and observe how the dissolved CO₂ front develops over time. My scenario is as follows: I use a two-dimensional mesh. At the top boun…

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## [Negative capillary pressure instability on the saturation front in the caprock during CO2 storage](https://discourse.opengeosys.org/t/negative-capillary-pressure-instability-on-the-saturation-front-in-the-caprock-during-co2-storage/1732)

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**Author:** [@tjlyh777](https://discourse.opengeosys.org/u/tjlyh777)\
**Replies:** 2\
**Last updated:** [November 14, 2025, 8:51am UTC](https://discourse.opengeosys.org/t/negative-capillary-pressure-instability-on-the-saturation-front-in-the-caprock-during-co2-storage/1732 "2025-11-14T08:51:08Z")

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Hi all, I have been simulating CO2 flow in a model with two layers, i.e., capock and aquifer, trying to model the CO2 invasion into the caprock. The size of the model is 50 x 7 m. The thickness of caprock is 1m and the t…

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## [How to Get Started with Reactive Transport Modeling in OGS6](https://discourse.opengeosys.org/t/how-to-get-started-with-reactive-transport-modeling-in-ogs6/1729)

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**Author:** [@KFC\_forever](https://discourse.opengeosys.org/u/KFC_forever)\
**Replies:** 4\
**Last updated:** [November 12, 2025, 12:47am UTC](https://discourse.opengeosys.org/t/how-to-get-started-with-reactive-transport-modeling-in-ogs6/1729 "2025-11-12T00:47:53Z")

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Hello everyone, Recently, I have been learning the Reactive Transport in OGS6 and have encountered several difficulties in understanding and applying it. I am already familiar with the numerical framework and general wo…

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## [Help needed in 3D BHE CXA design](https://discourse.opengeosys.org/t/help-needed-in-3d-bhe-cxa-design/1713)

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**Author:** [@xenner](https://discourse.opengeosys.org/u/xenner)\
**Replies:** 7\
**Last updated:** [October 30, 2025, 12:26pm UTC](https://discourse.opengeosys.org/t/help-needed-in-3d-bhe-cxa-design/1713 "2025-10-30T12:26:48Z")

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Hello all, I am a drilling engineer and we are working on a technology to reach approximately 20km by rotary drilling. The objective with this technology is to create big bore coaxial enhanced closed loop geothermal wel…

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## [ImportError: DLL load failed while importing simulator](https://discourse.opengeosys.org/t/importerror-dll-load-failed-while-importing-simulator/1674)

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**Author:** [@Diogo\_Folador\_Rossi](https://discourse.opengeosys.org/u/Diogo_Folador_Rossi)\
**Replies:** 4\
**Last updated:** [October 27, 2025, 11:54am UTC](https://discourse.opengeosys.org/t/importerror-dll-load-failed-while-importing-simulator/1674 "2025-10-27T11:54:23Z")

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Hello, I’m a beginner user of OpenGeoSys, but I think there is a problem with the binaries distributed by PIP packages: Folowing the procedure in Your first OGS run in 5 minutes with “Option 1: Python”, I set everythin…

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## [Hydro-mechanical coupling](https://discourse.opengeosys.org/t/hydro-mechanical-coupling/1716)

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**Author:** [@stefanjon](https://discourse.opengeosys.org/u/stefanjon)\
**Replies:** 3\
**Last updated:** [October 23, 2025, 1:09pm UTC](https://discourse.opengeosys.org/t/hydro-mechanical-coupling/1716 "2025-10-23T13:09:03Z")

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Hi, I am new to OpenGeoSys and I have questions about coupling mechanical and porous flow processes. I want to know if OpenGeoSys support coupling of the PDE at the solver level. What I mean by that is that mechanical …

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## [Defining initial stress state for a multilayer model](https://discourse.opengeosys.org/t/defining-initial-stress-state-for-a-multilayer-model/1705)

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**Author:** [@2ophie](https://discourse.opengeosys.org/u/2ophie)\
**Replies:** 2\
**Last updated:** [October 15, 2025, 9:51am UTC](https://discourse.opengeosys.org/t/defining-initial-stress-state-for-a-multilayer-model/1705 "2025-10-15T09:51:39Z")

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Dear community, I am trying to define the initial stress state (including Sv, Shmin and SHmax) for a multilayer model. In my case, the overburden is not a problem because it is automatically calculated from gravity and …

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## [PyVistaAttributeError when using MeshSeries.extract\_probe in “Reading OGS Output: Diffusion, Sorption, and Decay in a 1D Reactive Transport Model” tutorial](https://discourse.opengeosys.org/t/pyvistaattributeerror-when-using-meshseries-extract-probe-in-reading-ogs-output-diffusion-sorption-and-decay-in-a-1d-reactive-transport-model-tutorial/1700)

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**Author:** [@Ele](https://discourse.opengeosys.org/u/Ele)\
**Replies:** 2\
**Last updated:** [September 27, 2025, 2:14pm UTC](https://discourse.opengeosys.org/t/pyvistaattributeerror-when-using-meshseries-extract-probe-in-reading-ogs-output-diffusion-sorption-and-decay-in-a-1d-reactive-transport-model-tutorial/1700 "2025-09-27T14:14:35Z")

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Dear all, While following the official OGS tutorial “Reading OGS Output: Diffusion, Sorption, and Decay in a 1D Reactive Transport Model”, I encountered a PyVistaAttributeError when trying to extract time series data at…

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## [OGS\_6.5.5 + TH2M process + Output + sigma\_total](https://discourse.opengeosys.org/t/ogs-6-5-5-th2m-process-output-sigma-total/1681)

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**Author:** [@JP\_Kruse](https://discourse.opengeosys.org/u/JP_Kruse)\
**Replies:** 3\
**Last updated:** [September 2, 2025, 10:26am UTC](https://discourse.opengeosys.org/t/ogs-6-5-5-th2m-process-output-sigma-total/1681 "2025-09-02T10:26:47Z")

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Dear ogs-Team, I tried to add the total stress as output for models that use the TH2M process. When I try to add sigma\_total as secondary variable, ogs crashes with the following error message: critical: /\*\*\*/ogs-6.5.5…

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## [How to set property to change over time?](https://discourse.opengeosys.org/t/how-to-set-property-to-change-over-time/1677)

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**Author:** [@KFC\_forever](https://discourse.opengeosys.org/u/KFC_forever)\
**Replies:** 7\
**Last updated:** [September 2, 2025, 5:47am UTC](https://discourse.opengeosys.org/t/how-to-set-property-to-change-over-time/1677 "2025-09-02T05:47:55Z")

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Dear all, I want to set a property that varies over time (such as density) by Curve, but how should I set “curve\_name\_coords\</independent variable\>” (Independent variable needs to point to Time)? It seems that “curve\_n…

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## [Import ogs.callbacks gives "Import error"](https://discourse.opengeosys.org/t/import-ogs-callbacks-gives-import-error/1667)

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**Author:** [@einsor](https://discourse.opengeosys.org/u/einsor)\
**Replies:** 5\
**Last updated:** [August 26, 2025, 6:41am UTC](https://discourse.opengeosys.org/t/import-ogs-callbacks-gives-import-error/1667 "2025-08-26T06:41:01Z")

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I want to try to use the tespy package together with ogs, but doing so I have stumbled into a problem. Trying to run the 3D\_3BHEs\_array example I get an error at the “import ogs.callbacks” in the python files. Have used …

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## [Metis + integration points + petsc](https://discourse.opengeosys.org/t/metis-integration-points-petsc/1672)

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**Author:** [@carlos](https://discourse.opengeosys.org/u/carlos)\
**Replies:** 2\
**Last updated:** [August 22, 2025, 6:50am UTC](https://discourse.opengeosys.org/t/metis-integration-points-petsc/1672 "2025-08-22T06:50:03Z")

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Dear ogs-Team, we want to run a (restart) simulation using openmpi + petsc. The restart mesh contains integration points. We got the following warning: “warning: Could not open file ‘Mesh\_physical\_group\_Boundary\_Fron…

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## [Parsing \*.prj with ogstools](https://discourse.opengeosys.org/t/parsing-prj-with-ogstools/1664)

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**Author:** [@carlos](https://discourse.opengeosys.org/u/carlos)\
**Replies:** 5\
**Last updated:** [July 17, 2025, 11:52am UTC](https://discourse.opengeosys.org/t/parsing-prj-with-ogstools/1664 "2025-07-17T11:52:44Z")

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Hi, is it possible to parse the \*.prj file using ogs tools? For example, using the TH2M process, get all parameters (i.e parameter values) for the given phases? Thanks in advance. Cheers, Carlos

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## [HTC and temperature-dependent viscosity](https://discourse.opengeosys.org/t/htc-and-temperature-dependent-viscosity/1657)

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**Author:** [@jtecklenburg](https://discourse.opengeosys.org/u/jtecklenburg)\
**Replies:** 3\
**Last updated:** [July 10, 2025, 10:24am UTC](https://discourse.opengeosys.org/t/htc-and-temperature-dependent-viscosity/1657 "2025-07-10T10:24:51Z")

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Dear OGS Community, I would like to build a model of a geothermal doublet. In doing so, I want to take into account temperature-dependent viscosity as well as changes in porosity and permeability due to chemical process…

[Next page](https://discourse.opengeosys.org/tag/ogs6/5.md?match_all_tags=true&page=1&tags%5B%5D=ogs6)