# Latest **URL:** https://festim.discourse.group/latest.md?page=2 [Latest](https://festim.discourse.group/latest.md) · [Categories](https://festim.discourse.group/categories.md) · [Tags](https://festim.discourse.group/tags.md) **Page:** 3 --- ## [Understanding depth profiles](https://festim.discourse.group/t/understanding-depth-profiles/98)
**Author:** [@Ikshithaa](https://festim.discourse.group/u/Ikshithaa)\ **Replies:** 6\ **Last updated:** [February 20, 2025, 6:33pm UTC](https://festim.discourse.group/t/understanding-depth-profiles/98 "2025-02-20T18:33:31Z")
Hello, I am using FESTIM to understand hydrogen retention in displacement damage created by neutron radiation. I wanted to know if I don’t put Drichlet boundary conditions, can I still get depth profiles of deuterium in… --- ## [FESTIM Capabilities for Modeling Hydrogen Dissolving + Mixing Into Another Material](https://festim.discourse.group/t/festim-capabilities-for-modeling-hydrogen-dissolving-mixing-into-another-material/102)
**Author:** [@ckhurana768](https://festim.discourse.group/u/ckhurana768)\ **Replies:** 5\ **Last updated:** [February 18, 2025, 8:58am UTC](https://festim.discourse.group/t/festim-capabilities-for-modeling-hydrogen-dissolving-mixing-into-another-material/102 "2025-02-18T08:58:23Z")
Hello, I am modeling hydrogen gas injection into molten FLiNaK salt and want to verify if FESTIM is the appropriate tool for this. My goal is to track hydrogen content over time as it dissolves in the salt, how much re… --- ## [Wrong solution with 2D simulation](https://festim.discourse.group/t/wrong-solution-with-2d-simulation/95)
**Author:** [@miklavrent](https://festim.discourse.group/u/miklavrent)\ **Replies:** 15\ **Last updated:** [January 29, 2025, 2:43pm UTC](https://festim.discourse.group/t/wrong-solution-with-2d-simulation/95 "2025-01-29T14:43:23Z")
Hi again, I created 2d .xdmf files with your help and now am trying to make them work. This is strange, but FESTIM solves temperature field ok, but then fails to correctly solve for solute and retention. Looks like thes… --- ## [Version of FESTIM?](https://festim.discourse.group/t/version-of-festim/100)
**Author:** [@miklavrent](https://festim.discourse.group/u/miklavrent)\ **Replies:** 2\ **Last updated:** [January 29, 2025, 2:18pm UTC](https://festim.discourse.group/t/version-of-festim/100 "2025-01-29T14:18:45Z")
Probably very naive question - how to find which version of FESTIM do I use? --- ## [Chemical reactions](https://festim.discourse.group/t/chemical-reactions/92)
**Author:** [@HelenS](https://festim.discourse.group/u/HelenS)\ **Replies:** 8\ **Last updated:** [January 15, 2025, 5:31pm UTC](https://festim.discourse.group/t/chemical-reactions/92 "2025-01-15T17:31:47Z")
Hi again -still a very new user, gradually building up my model! I’m wondering if there is any functionality within FESTIM to do chemical reactions or phase changes - specifically from hydride to mobile solute (as a fun… --- ## [.xdmf from 2D .msh](https://festim.discourse.group/t/xdmf-from-2d-msh/93)
**Author:** [@miklavrent](https://festim.discourse.group/u/miklavrent)\ **Replies:** 3\ **Last updated:** [January 8, 2025, 3:05pm UTC](https://festim.discourse.group/t/xdmf-from-2d-msh/93 "2025-01-08T15:05:56Z")
Happy New Year everyone! I just tried to create .xdmf files from a 2D .msh file using Python script from https://festim.readthedocs.io/en/latest/userguide/mesh.html#converting-meshes-using-meshio And obtained: Traceb… --- ## [Double exports in TXTExport](https://festim.discourse.group/t/double-exports-in-txtexport/58)
**Author:** [@jairrs](https://festim.discourse.group/u/jairrs)\ **Replies:** 8\ **Last updated:** [December 21, 2024, 3:23pm UTC](https://festim.discourse.group/t/double-exports-in-txtexport/58 "2024-12-21T15:23:51Z")
Running this code import festim as F import numpy as np import sympy as sp from matplotlib import pyplot as plt C\_0 = 1 # atom m^-3 D = 1 # 1 m^2 s^-1 profile\_time = 25 # s exact\_solution = C\_0 \* (1 - sp.erf(F.x / sp.s… --- ## [Changing temperature settings at a certain time in the simulation](https://festim.discourse.group/t/changing-temperature-settings-at-a-certain-time-in-the-simulation/73)
**Author:** [@iamryo](https://festim.discourse.group/u/iamryo)\ **Replies:** 11\ **Last updated:** [December 21, 2024, 6:53am UTC](https://festim.discourse.group/t/changing-temperature-settings-at-a-certain-time-in-the-simulation/73 "2024-12-21T06:53:56Z")
Hi! :slightly\_smiling\_face: I am trying to reproduct a series of simulations from plasma irradiation to TDS. But, I faced one problem. During plasma irradiation, sample temperature is transient settings. model.T = F.… --- ## [Outputting data at t = 0](https://festim.discourse.group/t/outputting-data-at-t-0/91)
**Author:** [@HelenS](https://festim.discourse.group/u/HelenS)\ **Replies:** 2\ **Last updated:** [December 18, 2024, 2:21pm UTC](https://festim.discourse.group/t/outputting-data-at-t-0/91 "2024-12-18T14:21:15Z")
How do I output results at time zero, please? adding 0 to this line does not seem to work: F.TXTExport( field=“solute”, times=\[0,1,2,3,1000\], filename=results\_folder + “/mobile\_concentration.txt”, --- ## [Different BCs at different times](https://festim.discourse.group/t/different-bcs-at-different-times/82)
**Author:** [@cruiseraurora](https://festim.discourse.group/u/cruiseraurora)\ **Replies:** 9\ **Last updated:** [December 18, 2024, 2:08pm UTC](https://festim.discourse.group/t/different-bcs-at-different-times/82 "2024-12-18T14:08:35Z")
Hello! I want to simulate D2-gas loading phase, open-air phase and TDS phase. During gas loading and open-air phase, the Sievert’s law should be used, but in the TDS phase I want to apply RecombinationFlux bc. Is it pos… --- ## [The initial flux isn't zero in TDS simulation](https://festim.discourse.group/t/the-initial-flux-isnt-zero-in-tds-simulation/88)
**Author:** [@Jellycarrot](https://festim.discourse.group/u/Jellycarrot)\ **Replies:** 4\ **Last updated:** [December 17, 2024, 5:31pm UTC](https://festim.discourse.group/t/the-initial-flux-isnt-zero-in-tds-simulation/88 "2024-12-17T17:31:15Z")
Hi,I’m doing 1D TDS simulation.The gas is deuterium,and the material is tungsten. I found when I set E\_p near to E\_D(such as E\_p = 0.6 and E\_D = 0 .39),there will be a situation that the initial value of flux is not ze… --- ## [Setting initial H concentration](https://festim.discourse.group/t/setting-initial-h-concentration/90)
**Author:** [@HelenS](https://festim.discourse.group/u/HelenS)\ **Replies:** 2\ **Last updated:** [December 13, 2024, 2:33am UTC](https://festim.discourse.group/t/setting-initial-h-concentration/90 "2024-12-13T02:33:59Z")
I’m afraid I’m a little confused again about sources and initial conditions. I can now use ‘sources’, that introduce some H/m3/s (so the total H continually increases throughout the simulation). I now want to put in just… --- ## [Ratio between concentrations in different materials](https://festim.discourse.group/t/ratio-between-concentrations-in-different-materials/86)
**Author:** [@cruiseraurora](https://festim.discourse.group/u/cruiseraurora)\ **Replies:** 7\ **Last updated:** [November 26, 2024, 1:23pm UTC](https://festim.discourse.group/t/ratio-between-concentrations-in-different-materials/86 "2024-11-26T13:23:29Z")
Hello! Could you please tell me how the concentration jump between different materials is calculated in festim? I expected something like Ca = Sa/Sb \* Cb, where a, b - different materials, C - concentration at the mate… --- ## [The peak of the two-dimensional TDS spectrum can't be reduced to zero](https://festim.discourse.group/t/the-peak-of-the-two-dimensional-tds-spectrum-cant-be-reduced-to-zero/84)
**Author:** [@Jellycarrot](https://festim.discourse.group/u/Jellycarrot)\ **Replies:** 2\ **Last updated:** [November 8, 2024, 12:17pm UTC](https://festim.discourse.group/t/the-peak-of-the-two-dimensional-tds-spectrum-cant-be-reduced-to-zero/84 "2024-11-08T12:17:05Z")
Hi,I’m trying to draw a 2D TDS spectrum of tungsten containing one trap. But I found the total flux need very long time to reach the peak and it won’t reduce to zero while the flux out of the trap drop to 0 very quickly… --- ## [Several volumetric sources of heat](https://festim.discourse.group/t/several-volumetric-sources-of-heat/80)
**Author:** [@miklavrent](https://festim.discourse.group/u/miklavrent)\ **Replies:** 5\ **Last updated:** [November 1, 2024, 1:46pm UTC](https://festim.discourse.group/t/several-volumetric-sources-of-heat/80 "2024-11-01T13:46:24Z")
Hi, Is it possible to have different volumetric sources of heat in different parts of a system? Imagine a two layered first wall with neutrons generating different amount of heat in tungsten and steel. I was only able t… --- ## [Graphical User Interface 🪟](https://festim.discourse.group/t/graphical-user-interface/53)
**Author:** [@remidm](https://festim.discourse.group/u/remidm)\ **Replies:** 2\ **Last updated:** [October 29, 2024, 12:42pm UTC](https://festim.discourse.group/t/graphical-user-interface/53 "2024-10-29T12:42:48Z")
It would look like the python interface (though intuitive for most of users) is a barrier to some who don’t know how to code. I’m open to start brainstorming what a graphical user interface (GUI) would look like for FES… --- ## [Multi-material problem: initial trap distribution and diffusion barrier](https://festim.discourse.group/t/multi-material-problem-initial-trap-distribution-and-diffusion-barrier/71)
**Author:** [@VVKulagin](https://festim.discourse.group/u/VVKulagin)\ **Replies:** 3\ **Last updated:** [August 9, 2024, 2:41pm UTC](https://festim.discourse.group/t/multi-material-problem-initial-trap-distribution-and-diffusion-barrier/71 "2024-08-09T14:41:22Z")
Hi, all! Assume a multi-material problem (for example, W-Cu) with traps defined within one material only. There are two points that I’d like to discuss. 1.If the initial condition for traps is provided with a float, th… --- ## [Multi-material hydrogen permeation 3D model transient solution not converging](https://festim.discourse.group/t/multi-material-hydrogen-permeation-3d-model-transient-solution-not-converging/70)
**Author:** [@jaronfcota](https://festim.discourse.group/u/jaronfcota)\ **Replies:** 5\ **Last updated:** [August 9, 2024, 10:23am UTC](https://festim.discourse.group/t/multi-material-hydrogen-permeation-3d-model-transient-solution-not-converging/70 "2024-08-09T10:23:53Z")
Hello, I am having a bit of trouble with a model converging. I’m trying to model hydrogen permeation through a nickel membrane through molten FLiBe in a cylindrical geometry, and when I try and calculate the transient s… --- ## [Simulation stopping on simple permeation experiment](https://festim.discourse.group/t/simulation-stopping-on-simple-permeation-experiment/69)
**Author:** [@Ignacio-Marcos](https://festim.discourse.group/u/Ignacio-Marcos)\ **Replies:** 8\ **Last updated:** [August 1, 2024, 1:46pm UTC](https://festim.discourse.group/t/simulation-stopping-on-simple-permeation-experiment/69 "2024-08-01T13:46:41Z")
Hi everyone, I’m doing a simple series of permeation experiments with a set of different values for each parameter (diffusivity, Temperature and such), specifically, a full factorial DOE. I’m having trouble with the sim… --- ## [A series of simulations from plasma irradiation experiments to TDS](https://festim.discourse.group/t/a-series-of-simulations-from-plasma-irradiation-experiments-to-tds/65)
**Author:** [@iamryo](https://festim.discourse.group/u/iamryo)\ **Replies:** 9\ **Last updated:** [July 30, 2024, 7:01am UTC](https://festim.discourse.group/t/a-series-of-simulations-from-plasma-irradiation-experiments-to-tds/65 "2024-07-30T07:01:24Z")
Hi everyone, I am trying to reproduce a series of plasma irradiation experiments on tungsten and TDS.(The goal is to reproduce the TDS spectrum.) I am trying to reproduce a series of plasma irradiation and TDS with refe… --- ## [FESTIM 1.3 release 🎉](https://festim.discourse.group/t/festim-1-3-release/67)
**Author:** [@remidm](https://festim.discourse.group/u/remidm)\ **Replies:** 0\ **Last updated:** [July 29, 2024, 12:07pm UTC](https://festim.discourse.group/t/festim-1-3-release/67 "2024-07-29T12:07:25Z")
1.3 is out! One of the biggest releases so far! Lots of new functionalities, bug fixes and quality of life improvements! We encourage users to upgrade their FESTIM version with pip install -U festim Check out the comp… --- ## [Two Layered Monoblock](https://festim.discourse.group/t/two-layered-monoblock/64)
**Author:** [@celyn](https://festim.discourse.group/u/celyn)\ **Replies:** 8\ **Last updated:** [July 24, 2024, 2:31pm UTC](https://festim.discourse.group/t/two-layered-monoblock/64 "2024-07-24T14:31:05Z")
Hi, I’m trying to run a simulation for a two-layer monoblock in 2D, but I think there are issues when applying the mesh that I have created to FESTIM when it comes to applying surface boundary conditions. When plotting … --- ## [Inhomogeneous Dirichlet BC from csv file](https://festim.discourse.group/t/inhomogeneous-dirichlet-bc-from-csv-file/60)
**Author:** [@ehodille](https://festim.discourse.group/u/ehodille)\ **Replies:** 5\ **Last updated:** [July 23, 2024, 7:19am UTC](https://festim.discourse.group/t/inhomogeneous-dirichlet-bc-from-csv-file/60 "2024-07-23T07:19:13Z")
I have a y\[m\],cm\[m-3\] csv file and I would like to apply these values as an inhomogeneous Dirichlet boundary condition along one of the 1D boundary of my domain (here is a small sketch, if understandable). I created a… --- ## [Export point value](https://festim.discourse.group/t/export-point-value/61)
**Author:** [@xinshen](https://festim.discourse.group/u/xinshen)\ **Replies:** 2\ **Last updated:** [July 22, 2024, 1:59pm UTC](https://festim.discourse.group/t/export-point-value/61 "2024-07-22T13:59:23Z")
Hi everyone, I have a few questions when I want to export some values at some specific points using class PointValue. https://festim.readthedocs.io/en/latest/userguide/export\_post\_processing.html Is the coordinate in c… --- ## [Set different temperature at different boundaries](https://festim.discourse.group/t/set-different-temperature-at-different-boundaries/52)
**Author:** [@xinshen](https://festim.discourse.group/u/xinshen)\ **Replies:** 2\ **Last updated:** [June 22, 2024, 1:04am UTC](https://festim.discourse.group/t/set-different-temperature-at-different-boundaries/52 "2024-06-22T01:04:25Z")
Hi all, I’m trying to set different temperature at different boundaries, the code is shown below. From the view by Paraview, it seems that DirichletBC of temperature will be overrided by my\_model.T = F.Temperature(873),… --- ## [Concentration is zero in some subdomains](https://festim.discourse.group/t/concentration-is-zero-in-some-subdomains/51)
**Author:** [@xinshen](https://festim.discourse.group/u/xinshen)\ **Replies:** 8\ **Last updated:** [June 11, 2024, 4:19am UTC](https://festim.discourse.group/t/concentration-is-zero-in-some-subdomains/51 "2024-06-11T04:19:42Z")
Hi everyone. I performed a simulation of hydrogen transport in W/Cu/CuCrZr in 2D. I used big mesh size to make the computation quick. The exported chemical\_pot\_conservation derived\_quantities file show the result. As is… --- ## [Unable to successfully call PETSc function 'KSPSolve'](https://festim.discourse.group/t/unable-to-successfully-call-petsc-function-kspsolve/48)
**Author:** [@xinshen](https://festim.discourse.group/u/xinshen)\ **Replies:** 3\ **Last updated:** [June 5, 2024, 1:04am UTC](https://festim.discourse.group/t/unable-to-successfully-call-petsc-function-kspsolve/48 "2024-06-05T01:04:35Z")
Hi everyone. The code run but the process finished with exit code 1 as below. Line 167 is the last line of the code which is my\_model.run(). I would like to present a MWE to reproduce this error but failed. What can I … --- ## [Problems when reproducing the results of the article](https://festim.discourse.group/t/problems-when-reproducing-the-results-of-the-article/43)
**Author:** [@xinshen](https://festim.discourse.group/u/xinshen)\ **Replies:** 20\ **Last updated:** [May 31, 2024, 1:40am UTC](https://festim.discourse.group/t/problems-when-reproducing-the-results-of-the-article/43 "2024-05-31T01:40:00Z")
Hi everyone, I’m trying to reproduce the results of the article “Influence of interface conditions on hydrogen transport studies” and I have some questions. First, what do “OK TMAP” and “OK MUYI” in the source code mean… --- ## [Second peak in TDS simulation for a single trap](https://festim.discourse.group/t/second-peak-in-tds-simulation-for-a-single-trap/47)
**Author:** [@Jellycarrot](https://festim.discourse.group/u/Jellycarrot)\ **Replies:** 5\ **Last updated:** [May 27, 2024, 9:53am UTC](https://festim.discourse.group/t/second-peak-in-tds-simulation-for-a-single-trap/47 "2024-05-27T09:53:35Z")
Hi， I’m working on thermo-desorption spectra of hydrogen in tungsten with FESTIM.However,there’s a question that troubles me: Why does FESTIM’s TDS simulation for a single trap have a second peak after the first main p… --- ## [Tag the geometry with Salome](https://festim.discourse.group/t/tag-the-geometry-with-salome/45)
**Author:** [@xinshen](https://festim.discourse.group/u/xinshen)\ **Replies:** 4\ **Last updated:** [May 24, 2024, 12:21pm UTC](https://festim.discourse.group/t/tag-the-geometry-with-salome/45 "2024-05-24T12:21:00Z")
Hi all, I have a few questions about tagging the geometry with Salome. I would appreciate it if someone could help me. FESTIM-workshop/tasks/task08.ipynb FESTIM-workshop/tasks/task08.ipynb at main · festim-dev/FESTIM-… [Previous page](https://festim.discourse.group/latest.md?page=1) [Next page](https://festim.discourse.group/latest.md?page=3)