[GeoMechanicsApplication] setup a test for the triaxial experiment by Sabine-van-Dijk · Pull Request #14354 · KratosMultiphysics/Kratos

Sabine-van-Dijk · 2026-04-10T13:24:16Z

📝 Description

Set up a test for the triaxial experiment.

Key changes

The Project Properties file needed some changes to be able to run the element_integration_point_values_at_time function.

🆕 Changelog

Run a simulation in the element test gui.
Export the output files to the test folder
Compare the output of the displacement, the Cauchy stress and the engineering strain.

…d the right result with the element_integration_point_values_at_time function.

…triaxial test.

WPK4FEM

Hi Sabine,

Thank you for a good start of this test. You will find a lot of comments which are largely a direct result of how it was done for the element test software setup, hopefully they just help to make it even better. Please have a look at the remarks and also the following:

Maybe a natural place for this new test is withing tests/test_element_lab

Regards, Wijtze Pieter

WPK4FEM · 2026-04-13T08:31:39Z

+from applications.GeoMechanicsApplication.tests import test_helper
+from kratos.python_scripts import KratosUnittest
+
+class KratosGeoMechanicsTriaxialTests(KratosUnittest.TestCase):


To have this test running automatically in one of the test suites, its class name needs to be added in one of the lists of test cases in test_GeoMechanicsApplication.py

Yes, it should be added to small_test_cases list, I think.

WPK4FEM · 2026-04-13T08:35:01Z

+        """
+        The output for the test was generated for the Mohr Coulomb model using the following material properties:
+        "YOUNG_MODULUS": 20000.0,
+        "POISSON_RATIO": 0.25,
+        "COHESION": 2.0,
+        "FRICTION_ANGLE": 25.0,
+        "DILATANCY_ANGLE": 2.0
+        """


This kind of description I would expect in a REAMDE.md file in this directory with a schematic picture of the test and maybe graphs of the results in time. Please have a look at e.g. the README.md file in tests/building_pit for a very elaborate example.

indigocoral

Thank you, Sabine, for adding this Triaxial test. It's a very good start indeed. The main change is for the set up of the test which was done by the ElementTest GUI. As Wijtze Pieter has also mentioned, we would need to add a README.md document for this test.

indigocoral · 2026-04-13T15:10:06Z

+        "problem_name": "triaxial",
+        "parallel_type": "OpenMP",
+        "echo_level": 1,
+        "start_time": 0.0,


Changing this to -0.1 so the cell confining pressure can happen beforehand between time -0.1 till 0.0. And then the prescribed displacement can happen within 100 steps between time 0.0 and time 1.0.

Suggested change

"start_time": 0.0,

"start_time": -0.1,

indigocoral · 2026-04-13T15:16:03Z

+from applications.GeoMechanicsApplication.tests import test_helper
+from kratos.python_scripts import KratosUnittest
+
+class KratosGeoMechanicsTriaxialTests(KratosUnittest.TestCase):


Yes, it should be added to small_test_cases list, I think.

WPK4FEM

Hi Sabine,

Its coming closer. Please the test to the testsuite to let it run automagically, change the bottom condition in the picture to rollers and put some well chosen text + the nice picture in a README.md file and then its good to go for me.

Thank you, Wijtze Pieter

WPK4FEM · 2026-04-15T12:23:23Z

The fully fixed condition at the bottom of the picture does not match the roller conditions ( only Y fixed ) in the ProjectParameters. As the json file decides what the computation is, please adapt the picture.

WPK4FEM · 2026-04-15T12:25:43Z

        },
        "time_stepping": {
-            "time_step": 8.640000000000002e+03,
+            "time_step": 8.64e+03,


This is a change ( and the other dsettlement project parameters file too ) unrelated to the purpose of the pull request. Still, it is an improvement.

Sabine-van-Dijk · 2026-04-15T15:07:24Z

Because I added the test to the already existing test_element_lab it was already in the testsuite.

indigocoral

Hi Sabine,
Firstly, apologies from my side about the schematic's base condition. Thanks @WPK4FEM for your comment on it.
Thanks for moving the test to the test_element_lab.py and the corresponding folder. And also for applying the requested changes.
I just have a question about adding the material file to the exception list. I thought we would always format the new files and this exception list is for the old files? Perhaps I have missed the decision here....
Although I saw in your commits that the DYNAMIC_VISCOSITY had an unexpected change...

…m the gid output that we do not assert in the test)

Sabine-van-Dijk · 2026-04-17T08:42:19Z

I changed the code a bit to do some testing yesterday and thought it was nice to leave it this way with the assertAlmostEqual instead of the assertEqual for future tests

WPK4FEM

Hi Sabine,
Lets get this on master. In a later revision, you may want to alter the README sligthly: the top nodes that are moved go from y=1.0 to y=0.8, its the displacement u_y that goes from 0.0 to -0.2
That you form creating a complete set with picture and documentation.
Wijtze Pieter

Sabine-van-Dijk added 5 commits April 9, 2026 11:26

Add test triaxial

adc5bc2

Add input files to test folder

3927995

Added running of the test triaxial in the test script

816d73a

Changed the Project Parameters to WriteElementsOnly to be able to rea…

22f4352

…d the right result with the element_integration_point_values_at_time function.

Add tests to check the displacement, stress and strain values in the …

147c645

…triaxial test.

Sabine-van-Dijk self-assigned this Apr 10, 2026

Sabine-van-Dijk added the GeoMechanics Issues related to the GeoMechanicsApplication label Apr 10, 2026

Sabine-van-Dijk requested a review from a team as a code owner April 10, 2026 13:24

Sabine-van-Dijk linked an issue Apr 10, 2026 that may be closed by this pull request

[GeoMechanicsApplication] add triaxial integration test to kratos tests #14356

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Sabine-van-Dijk requested review from WPK4FEM and indigocoral April 10, 2026 14:14

WPK4FEM requested changes Apr 13, 2026

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indigocoral reviewed Apr 13, 2026

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Sabine-van-Dijk added 8 commits April 14, 2026 13:14

make a drawing for the triaxial test readme

19ca040

move the triaxial test folder inside the test_element_lab folder

f65e652

kp format

c52db8d

change output name and remove unused (arc-length) settings

1451b4b

change output name in python script

ed4616d

undo formatting error and add file to formatting exceptions list

fe2d584

adjust test input parameters

aab84cc

add adjusted triaxial test to the test_element_lab

5a45299

WPK4FEM reviewed Apr 15, 2026

View reviewed changes

add README file with (adjusted) schematic

d14a42e

indigocoral reviewed Apr 15, 2026

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Sabine-van-Dijk added 3 commits April 17, 2026 10:33

Small changes in README file

1fd2414

change start time to be a single time step (and remove parameters fro…

9e28ba5

…m the gid output that we do not assert in the test)

assertAlmostEqual for the different elements

c3f2cb8

forgot 1 formatting change

34a028c

WPK4FEM approved these changes Apr 17, 2026

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Sabine-van-Dijk commented Apr 10, 2026

📝 Description

Key changes

🆕 Changelog

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Sabine-van-Dijk commented Apr 17, 2026

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