# \#fish **URL:** https://forum.itascainternational.com/tag/fish/1.md [Latest](https://forum.itascainternational.com/latest.md) · [Categories](https://forum.itascainternational.com/categories.md) · [Tags](https://forum.itascainternational.com/tags.md) --- ## [Accessing fish structure in python](https://forum.itascainternational.com/t/accessing-fish-structure-in-python/2419)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 0\ **Last updated:** [October 8, 2026, 6:47pm UTC](https://forum.itascainternational.com/t/accessing-fish-structure-in-python/2419 "2026-10-08T18:47:35Z")
Dear all, Does anyone as experience getting fish structures into python? What I mean is that you can access fish variables in python using itasca.fish.get() function. This does not work for fish structures as you get … --- ## [Energy Components Calculations in PFC](https://forum.itascainternational.com/t/energy-components-calculations-in-pfc/2142)
**Author:** [@AlaaAbdallah](https://forum.itascainternational.com/u/AlaaAbdallah)\ **Replies:** 6\ **Last updated:** [August 10, 2026, 5:33pm UTC](https://forum.itascainternational.com/t/energy-components-calculations-in-pfc/2142 "2026-08-10T17:33:34Z")
Hello, Could anyone please help in navigating to a script or fishtank package that calculates the energy components in a rock specimen after triaxial testing? Thanks. --- ## [Error in restoring the model inside the loop](https://forum.itascainternational.com/t/error-in-restoring-the-model-inside-the-loop/2077)
**Author:** [@SahilW](https://forum.itascainternational.com/u/SahilW)\ **Replies:** 4\ **Last updated:** [July 31, 2026, 11:01am UTC](https://forum.itascainternational.com/t/error-in-restoring-the-model-inside-the-loop/2077 "2026-07-31T11:01:20Z")
Dear all, I want to restore the model inside the loop so I can automate the extraction of the results. But when I try the following code, it gives me the error :" fish define dataextract loop local i(0,15) local e0 … --- ## [Error: Property pb\_radius of contact model linearpbond is read only!](https://forum.itascainternational.com/t/error-property-pb-radius-of-contact-model-linearpbond-is-read-only/2402)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 1\ **Last updated:** [July 27, 2026, 1:23pm UTC](https://forum.itascainternational.com/t/error-property-pb-radius-of-contact-model-linearpbond-is-read-only/2402 "2026-07-27T13:23:40Z")
Hello everyone, I am trying to assign the following parallel bond properties in PFC3D: contact property pb\_ten 2.111e4 pb\_coh 3.0e3 pb\_fa 35 pb\_rmul 2.5 pb\_r 0.5 However, I receive the following error: \*\*\* Property … --- ## [Can a time varying external load applied to a saturated soil mass generate excess pore pressure when using Mohr-Coulomb in a coupled fluid-mechanical analysis?](https://forum.itascainternational.com/t/can-a-time-varying-external-load-applied-to-a-saturated-soil-mass-generate-excess-pore-pressure-when-using-mohr-coulomb-in-a-coupled-fluid-mechanical-analysis/2395)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 0\ **Last updated:** [June 15, 2026, 5:21pm UTC](https://forum.itascainternational.com/t/can-a-time-varying-external-load-applied-to-a-saturated-soil-mass-generate-excess-pore-pressure-when-using-mohr-coulomb-in-a-coupled-fluid-mechanical-analysis/2395 "2026-06-15T17:21:35Z")
Hello @everyone, @itascaYang @isaac @itsmoho\_sen @ITE @itascaYang @itasca @dafo407\_itasca @ddegagne @dblanksma @itmam I am running a coupled fluid–mechanical FLAC3D model using the Mohr-Coulomb constitutive model. I hav… --- ## [Modeling Centrifuge Test with Attached Boundary Conditions in FLAC](https://forum.itascainternational.com/t/modeling-centrifuge-test-with-attached-boundary-conditions-in-flac/1779)
**Author:** [@EmirhanAltinok](https://forum.itascainternational.com/u/EmirhanAltinok)\ **Replies:** 4\ **Last updated:** [June 11, 2026, 9:05pm UTC](https://forum.itascainternational.com/t/modeling-centrifuge-test-with-attached-boundary-conditions-in-flac/1779 "2026-06-11T21:05:35Z")
Hello Everyone, I am currently working on modeling a centrifuge test at prototype scale. My geometry includes three liquefiable sand layers with varying relative densities (Dr), so I am using the PM4Sand model. The expe… --- ## [Wetting Induced Deformation Simulation- Infiltration result questionable](https://forum.itascainternational.com/t/wetting-induced-deformation-simulation-infiltration-result-questionable/2381)
**Author:** [@Adams](https://forum.itascainternational.com/u/Adams)\ **Replies:** 0\ **Last updated:** [May 8, 2026, 6:53pm UTC](https://forum.itascainternational.com/t/wetting-induced-deformation-simulation-infiltration-result-questionable/2381 "2026-05-08T18:53:52Z")
Hi, I am trying to simulate a wetting induced deformation of an embankment. I used FISH function to couple the hydraulic and stress strain behavior using Modified Cam Clay as the mechanical constitutive model and hydraul… --- ## [Difficulty with staged embankment construction using Modified Cam Clay in FLAC3D (yield envelope error)](https://forum.itascainternational.com/t/difficulty-with-staged-embankment-construction-using-modified-cam-clay-in-flac3d-yield-envelope-error/2376)
**Author:** [@Adams](https://forum.itascainternational.com/u/Adams)\ **Replies:** 2\ **Last updated:** [April 21, 2026, 7:48pm UTC](https://forum.itascainternational.com/t/difficulty-with-staged-embankment-construction-using-modified-cam-clay-in-flac3d-yield-envelope-error/2376 "2026-04-21T19:48:14Z")
I am attempting to simulate a compacted highway embankment in FLAC3D following the general framework for unsaturated hydro-mechanical behavior of compacted fill. My workflow involves staged construction of the embankment… --- ## [Heterogeneity in the properties of material of particles](https://forum.itascainternational.com/t/heterogeneity-in-the-properties-of-material-of-particles/2378)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 2\ **Last updated:** [April 21, 2026, 12:49pm UTC](https://forum.itascainternational.com/t/heterogeneity-in-the-properties-of-material-of-particles/2378 "2026-04-21T12:49:47Z")
I am working on slope modelling using the Voronoi block approach in 3DEC to represent a heterogeneous rock mass/overburden dump. I would like to assign different material properties to individual Voronoi blocks in order … --- ## [Plotting disp-x relative to the bottom](https://forum.itascainternational.com/t/plotting-disp-x-relative-to-the-bottom/2358)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 2\ **Last updated:** [April 2, 2026, 7:33pm UTC](https://forum.itascainternational.com/t/plotting-disp-x-relative-to-the-bottom/2358 "2026-04-02T19:33:26Z")
How do I define an extra variable in FLAC v9 so I can plot x‑displacement relative to the base of the model? In FLAC v8 I used something like: ex\_30($iev, $jev) = xdisp($iev, $jev) - xdisp($iev, 1) What’s the equivalen… --- ## [Examples for Coupling of UDEC/3DEC and FLAC/FLAC3D](https://forum.itascainternational.com/t/examples-for-coupling-of-udec-3dec-and-flac-flac3d/836)
**Author:** [@xiongyu](https://forum.itascainternational.com/u/xiongyu)\ **Replies:** 16\ **Last updated:** [March 2, 2026, 3:59pm UTC](https://forum.itascainternational.com/t/examples-for-coupling-of-udec-3dec-and-flac-flac3d/836 "2026-03-02T15:59:57Z")
Is there any examples (codes) for coupling of UDEC/3DEC and FLAC/FLAC3D? --- ## [Query about Rayleigh Damping Parameters in FLAC3D](https://forum.itascainternational.com/t/query-about-rayleigh-damping-parameters-in-flac3d/2299)
**Author:** [@MiguelN](https://forum.itascainternational.com/u/MiguelN)\ **Replies:** 5\ **Last updated:** [January 22, 2026, 4:21am UTC](https://forum.itascainternational.com/t/query-about-rayleigh-damping-parameters-in-flac3d/2299 "2026-01-22T04:21:53Z")
How can I query FLAC3D, version 7 or 9, to obtain the Rayleigh damping parameters (specially about alpha & beta), either through FISH or from the command line? Thanks in advance --- ## [Planarity in mesh generated with Griddle](https://forum.itascainternational.com/t/planarity-in-mesh-generated-with-griddle/2268)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 2\ **Last updated:** [January 20, 2026, 1:20pm UTC](https://forum.itascainternational.com/t/planarity-in-mesh-generated-with-griddle/2268 "2026-01-20T13:20:47Z")
Hi, I have recently started using Griddle for meshing. And I found that the mesh I generate have a bad planarity of zone faces compared to other generation methods (which makes sens in a way as Griddle is used to handle… --- ## [How to access zone joint contacts via FISH/Python](https://forum.itascainternational.com/t/how-to-access-zone-joint-contacts-via-fish-python/2310)
**Author:** [@LeoBBL](https://forum.itascainternational.com/u/LeoBBL)\ **Replies:** 2\ **Last updated:** [January 7, 2026, 11:32pm UTC](https://forum.itascainternational.com/t/how-to-access-zone-joint-contacts-via-fish-python/2310 "2026-01-07T23:32:50Z")
Hi everyone, I’m trying to find a way to access to zone joint contact variables either via FISH or Python (e.g., get/set properties, displacements, state, extras, etc). I haven’t found any guidance in the available docu… --- ## [Correct Way to Represent a Pumping Well in FLAC3D?](https://forum.itascainternational.com/t/correct-way-to-represent-a-pumping-well-in-flac3d/2306)
**Author:** [@Wenjie](https://forum.itascainternational.com/u/Wenjie)\ **Replies:** 2\ **Last updated:** [December 12, 2025, 1:26am UTC](https://forum.itascainternational.com/t/correct-way-to-represent-a-pumping-well-in-flac3d/2306 "2025-12-12T01:26:49Z")
Hello, I am simulating a pumping scenario, and my procedure is as follows: 1. I use a command to search for the grid points around the well (using range cylinder). Suppose the total number of selected grid points … --- ## [Mesh and zone quality checks](https://forum.itascainternational.com/t/mesh-and-zone-quality-checks/297)
**Author:** [@ALG](https://forum.itascainternational.com/u/ALG)\ **Replies:** 8\ **Last updated:** [December 1, 2025, 4:11pm UTC](https://forum.itascainternational.com/t/mesh-and-zone-quality-checks/297 "2025-12-01T16:11:35Z")
Hello all, Does anyone want to share their zone/mesh quality checking routine? A process to highlight poor zones that may cause issues for the model to solve. I guess the obvious one is the zone.test.quality command, w… --- ## [Distance between a point/vector and a fracture](https://forum.itascainternational.com/t/distance-between-a-point-vector-and-a-fracture/2236)
**Author:** [@lucasbmachado](https://forum.itascainternational.com/u/lucasbmachado)\ **Replies:** 1\ **Last updated:** [September 19, 2025, 5:35pm UTC](https://forum.itascainternational.com/t/distance-between-a-point-vector-and-a-fracture/2236 "2025-09-19T17:35:26Z")
Hello everyone, I want to find all nodes/points or vectors (positions) inside my fracture (distance = 0). When I use fracture.position, I only get the center vector, but I don’t want to compare the center of the fractur… --- ## [Error (newccell): block vertex outside cell space](https://forum.itascainternational.com/t/error-newccell-block-vertex-outside-cell-space/2235)
**Author:** [@Mahdi.S](https://forum.itascainternational.com/u/Mahdi.S)\ **Replies:** 1\ **Last updated:** [September 18, 2025, 2:02pm UTC](https://forum.itascainternational.com/t/error-newccell-block-vertex-outside-cell-space/2235 "2025-09-18T14:02:22Z")
Hello everyone, I am simulating a large-scale open pit in 3DEC (FEM with a single major structure only) and I am encountering the following error: \*\*\* error (newccell): block vertex outside cell space. Could anyone … --- ## [Model termination during initial loading phase](https://forum.itascainternational.com/t/model-termination-during-initial-loading-phase/671)
**Author:** [@eneszengin](https://forum.itascainternational.com/u/eneszengin)\ **Replies:** 3\ **Last updated:** [September 5, 2025, 3:53pm UTC](https://forum.itascainternational.com/t/model-termination-during-initial-loading-phase/671 "2025-09-05T15:53:16Z")
Hi everyone, I have a problem I can not solve for over 2 weeks. I’m working on confined tests with different confining pressure values. I’m using the material support package and did not change any material properties p… --- ## [Error while running a script](https://forum.itascainternational.com/t/error-while-running-a-script/2156)
**Author:** [@AlaaAbdallah](https://forum.itascainternational.com/u/AlaaAbdallah)\ **Replies:** 2\ **Last updated:** [July 22, 2025, 6:55pm UTC](https://forum.itascainternational.com/t/error-while-running-a-script/2156 "2025-07-22T18:55:50Z")
Hello, I have faced this error and I was unable to solve it. Could anyone please help me or direct me how to solve such errors? Best regards, Alaa --- ## [Applying load problem](https://forum.itascainternational.com/t/applying-load-problem/2176)
**Author:** [@Zakaria](https://forum.itascainternational.com/u/Zakaria)\ **Replies:** 2\ **Last updated:** [July 20, 2025, 2:33pm UTC](https://forum.itascainternational.com/t/applying-load-problem/2176 "2025-07-20T14:33:53Z")
Hello everyone, I’m trying to apply a water load using a fish function but it goes wrong when the gridpoint is shared by 5 faces. The function depends on the orientation, the size and the area of each face belonging to… --- ## [FLAC3D crashes while running this script](https://forum.itascainternational.com/t/flac3d-crashes-while-running-this-script/2167)
**Author:** [@roozbeh](https://forum.itascainternational.com/u/roozbeh)\ **Replies:** 0\ **Last updated:** [July 15, 2025, 8:30pm UTC](https://forum.itascainternational.com/t/flac3d-crashes-while-running-this-script/2167 "2025-07-15T20:30:44Z")
Hi The goal of this model is to calculate settlement resulting from water table drawdown. I based it on the “One-Dimensional Consolidation Considering Secondary Compression” example from the manual, with a simple modifi… --- ## [Principal stress direction vectors](https://forum.itascainternational.com/t/principal-stress-direction-vectors/2131)
**Author:** [@LeoBBL](https://forum.itascainternational.com/u/LeoBBL)\ **Replies:** 11\ **Last updated:** [July 3, 2025, 9:35pm UTC](https://forum.itascainternational.com/t/principal-stress-direction-vectors/2131 "2025-07-03T21:35:21Z")
Hi Everyone When obtaining the principal stress directions (with block.zone.stress.prin.dir ), do the vectors correspond to the actual orientation of the stresses or to the normal vectors of each principal plane? Thanks… --- ## [Computing heat flux at a fic temperature boundary](https://forum.itascainternational.com/t/computing-heat-flux-at-a-fic-temperature-boundary/2147)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 1\ **Last updated:** [July 2, 2025, 6:41pm UTC](https://forum.itascainternational.com/t/computing-heat-flux-at-a-fic-temperature-boundary/2147 "2025-07-02T18:41:45Z")
Hi, In am using FLAC3D in Thermal only mode. I am trying to compute the thermal heat flux along a boundary were I have fixed the temperature at gridpoints. The way I do it: I collect all the zones that have a face a… --- ## [Excavation relaxation by incrementally reducing reaction forces](https://forum.itascainternational.com/t/excavation-relaxation-by-incrementally-reducing-reaction-forces/197)
**Author:** [@jmswdmn](https://forum.itascainternational.com/u/jmswdmn)\ **Replies:** 7\ **Last updated:** [July 2, 2025, 4:59pm UTC](https://forum.itascainternational.com/t/excavation-relaxation-by-incrementally-reducing-reaction-forces/197 "2025-07-02T16:59:09Z")
Hi, I believe the “solve relax” function in FLAC3D carries out stiffness reduction until the zone is null. Previously a fish function was made available for UDEC and 3DEC, which instead “zonked” excavations, by increme… --- ## [How to define the user-defined function in the C++ package of a new joint constitutive model as a pointer?](https://forum.itascainternational.com/t/how-to-define-the-user-defined-function-in-the-c-package-of-a-new-joint-constitutive-model-as-a-pointer/2132)
**Author:** [@jessie](https://forum.itascainternational.com/u/jessie)\ **Replies:** 4\ **Last updated:** [June 20, 2025, 4:33am UTC](https://forum.itascainternational.com/t/how-to-define-the-user-defined-function-in-the-c-package-of-a-new-joint-constitutive-model-as-a-pointer/2132 "2025-06-20T04:33:40Z")
--- ## [Lateral load vs deflection curve](https://forum.itascainternational.com/t/lateral-load-vs-deflection-curve/1895)
**Author:** [@meale](https://forum.itascainternational.com/u/meale)\ **Replies:** 4\ **Last updated:** [May 13, 2025, 6:26am UTC](https://forum.itascainternational.com/t/lateral-load-vs-deflection-curve/1895 "2025-05-13T06:26:15Z")
Hi everyone, I was simulating a lateral load test on a triple batter pile to obtain the load deflection curve. The ultimate bearing capacity of the pile is calculated by applying a horizontal velocity at the top of the … --- ## [Tables in Python?](https://forum.itascainternational.com/t/tables-in-python/2054)
**Author:** [@paul](https://forum.itascainternational.com/u/paul)\ **Replies:** 3\ **Last updated:** [May 4, 2025, 7:30pm UTC](https://forum.itascainternational.com/t/tables-in-python/2054 "2025-05-04T19:30:12Z")
I’m working on a dynamic analysis project and developing Python scripts to verify certain modelling assumptions. One key step is comparing the source outcrop ground motion to the surface response of my FLAC2D model to e… --- ## [Import CSV, write variables to contact extra slots](https://forum.itascainternational.com/t/import-csv-write-variables-to-contact-extra-slots/2048)
**Author:** [@zack.tuckey](https://forum.itascainternational.com/u/zack.tuckey)\ **Replies:** 1\ **Last updated:** [April 21, 2025, 3:24am UTC](https://forum.itascainternational.com/t/import-csv-write-variables-to-contact-extra-slots/2048 "2025-04-21T03:24:05Z")
Hi all, I am looking to create a plot that compares contact data from two different save states for different modelling scenarios in UDEC v7. From each of the two save states I have exported a text file with contact da… --- ## [Compute discharge through an internal zone](https://forum.itascainternational.com/t/compute-discharge-through-an-internal-zone/2015)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 1\ **Last updated:** [April 15, 2025, 6:54pm UTC](https://forum.itascainternational.com/t/compute-discharge-through-an-internal-zone/2015 "2025-04-15T18:54:25Z")
Hi, I want to compute the fluid flow through an internal limit in the model. For example the flow that pass a certain given depth. Therefore the computation can be on zones or gridpoint depending of what is the simples… [Next page](https://forum.itascainternational.com/tag/fish/1.md?match_all_tags=true&page=1&tags%5B%5D=fish)