# \#faq **URL:** https://forum.itascainternational.com/tag/faq/6.md [Latest](https://forum.itascainternational.com/latest.md) · [Categories](https://forum.itascainternational.com/categories.md) · [Tags](https://forum.itascainternational.com/tags.md) --- ## [Output contour values via profile](https://forum.itascainternational.com/t/output-contour-values-via-profile/799)
**Author:** [@jwang](https://forum.itascainternational.com/u/jwang)\ **Replies:** 2\ **Last updated:** [February 19, 2026, 3:46pm UTC](https://forum.itascainternational.com/t/output-contour-values-via-profile/799 "2026-02-19T15:46:01Z")
A simple way is creating a profile (Plot-\>profile), select the item to create(e.g. xdisp ) and draw a line along the top surface, and then create a profile, in the profile window, right click on the plot, press ‘view dat… --- ## [What hardware do Itasca consultants use to run Itasca software?](https://forum.itascainternational.com/t/what-hardware-do-itasca-consultants-use-to-run-itasca-software/142)
**Author:** [@ddegagne](https://forum.itascainternational.com/u/ddegagne)\ **Replies:** 9\ **Last updated:** [January 23, 2026, 6:11am UTC](https://forum.itascainternational.com/t/what-hardware-do-itasca-consultants-use-to-run-itasca-software/142 "2026-01-23T06:11:10Z")
Itasca Consulting Group engineers run their models on “crunchers,” which are powerful PC computers. Our IT team currently (as of October 2021) defines the following system configurations as crunchers. These are only gene… --- ## [Coupling of FLAC3D v9 and PFC v7](https://forum.itascainternational.com/t/coupling-of-flac3d-v9-and-pfc-v7/1155)
**Author:** [@Mussie](https://forum.itascainternational.com/u/Mussie)\ **Replies:** 4\ **Last updated:** [March 18, 2025, 9:23am UTC](https://forum.itascainternational.com/t/coupling-of-flac3d-v9-and-pfc-v7/1155 "2025-03-18T09:23:45Z")
Dear ITASCA-Team, is coupling between FLAC3D v9 and PFC v7 still possible and are the examples from the documentation still applicable? Regards Mussie --- ## [The coupling between PFC2D and FLAC2D in Version 7](https://forum.itascainternational.com/t/the-coupling-between-pfc2d-and-flac2d-in-version-7/1502)
**Author:** [@Hansenn](https://forum.itascainternational.com/u/Hansenn)\ **Replies:** 1\ **Last updated:** [June 6, 2024, 3:25pm UTC](https://forum.itascainternational.com/t/the-coupling-between-pfc2d-and-flac2d-in-version-7/1502 "2024-06-06T15:25:51Z")
Dear all Itascan, I have a short question. How can I make the coupling between PFC2D and FLAC2D in Version 7? Can you give me some suggestions? Best regards, Hansenn --- ## [FOB meaning in the gridpoint info window](https://forum.itascainternational.com/t/fob-meaning-in-the-gridpoint-info-window/1440)
**Author:** [@Carlos\_Mora](https://forum.itascainternational.com/u/Carlos_Mora)\ **Replies:** 1\ **Last updated:** [May 7, 2024, 3:45pm UTC](https://forum.itascainternational.com/t/fob-meaning-in-the-gridpoint-info-window/1440 "2024-05-07T15:45:32Z")
Hello! a quick one, what´s the meaning of FOB in the information window for a gridpoint? Thanks in advance, Carlos. --- ## [Problem opening FLAC3D](https://forum.itascainternational.com/t/problem-opening-flac3d/1393)
**Author:** [@Carlos\_Mora](https://forum.itascainternational.com/u/Carlos_Mora)\ **Replies:** 6\ **Last updated:** [April 4, 2024, 7:43am UTC](https://forum.itascainternational.com/t/problem-opening-flac3d/1393 "2024-04-04T07:43:02Z")
Hi Itascans, we can not open FLAC3D v7 properly. When we tap the FLAC3D icon, it is open in the taskbar but are not able to see the GUI, it seems is open in another space. We have tried with several extra monitors even r… --- ## [Two phase flow in FLAC](https://forum.itascainternational.com/t/two-phase-flow-in-flac/170)
**Author:** [@xiongyu](https://forum.itascainternational.com/u/xiongyu)\ **Replies:** 1\ **Last updated:** [February 2, 2022, 9:18pm UTC](https://forum.itascainternational.com/t/two-phase-flow-in-flac/170 "2022-02-02T21:18:00Z")
i use two-phase flow option in FLAC 8.0 version to simulate carbon dioxide injection into the deep ground undersea floor. When the “udcoe” is initialized to 0 in my model, all the results seem reasonable except the disp… --- ## [Some helpful links for online resources](https://forum.itascainternational.com/t/some-helpful-links-for-online-resources/113)
**Author:** [@jwang](https://forum.itascainternational.com/u/jwang)\ **Replies:** 2\ **Last updated:** [April 21, 2023, 1:19pm UTC](https://forum.itascainternational.com/t/some-helpful-links-for-online-resources/113 "2023-04-21T13:19:30Z")
Applied Examples: https://www.itascacg.com/software/support/examples Tutorials: https://www.itascacg.com/learning/tutorials UDMs: UDM Library | US Minneapolis - Itasca Consulting Gr… --- ## [PFC3D C++ Plugin Template Error](https://forum.itascainternational.com/t/pfc3d-c-plugin-template-error/983)
**Author:** [@awbrandt](https://forum.itascainternational.com/u/awbrandt)\ **Replies:** 1\ **Last updated:** [April 5, 2023, 7:56pm UTC](https://forum.itascainternational.com/t/pfc3d-c-plugin-template-error/983 "2023-04-05T19:56:50Z")
I followed the instructions on the “Creating Contact Model DLLs from the MSVS Project Template” page of the Contact Model Plug-Ins site on the Itasca website, but when I try to create the new project from the Itasca Cont… --- ## [Modified Hertz Model - C++](https://forum.itascainternational.com/t/modified-hertz-model-c/982)
**Author:** [@awbrandt](https://forum.itascainternational.com/u/awbrandt)\ **Replies:** 1\ **Last updated:** [April 5, 2023, 2:59pm UTC](https://forum.itascainternational.com/t/modified-hertz-model-c/982 "2023-04-05T14:59:44Z")
I am looking to modify the contactmodelhertz.h and/or contactmodelhertz.cpp in PFC3D to remove the ability of a ball-wall or pebble-wall interface to experience frictional slip (i.e. a clump and a wall will translate tog… --- ## [How to use the 'ball distribute gauss ..' command correctly?](https://forum.itascainternational.com/t/how-to-use-the-ball-distribute-gauss-command-correctly/933)
**Author:** [@pprasad](https://forum.itascainternational.com/u/pprasad)\ **Replies:** 1\ **Last updated:** [February 21, 2023, 7:45pm UTC](https://forum.itascainternational.com/t/how-to-use-the-ball-distribute-gauss-command-correctly/933 "2023-02-21T19:45:39Z")
I’m trying to use the ball distribute command with the gauss keyword, and I’m planning to provide two arguments for the mean and standard deviation of the gauss function. However, it appears that the ‘gauss’ keyword is o… --- ## [Inhibit Slipping Behavior in PFC3D](https://forum.itascainternational.com/t/inhibit-slipping-behavior-in-pfc3d/903)
**Author:** [@awbrandt](https://forum.itascainternational.com/u/awbrandt)\ **Replies:** 3\ **Last updated:** [February 9, 2023, 3:08pm UTC](https://forum.itascainternational.com/t/inhibit-slipping-behavior-in-pfc3d/903 "2023-02-09T15:08:23Z")
Is there a way to prevent sliding (or inhibit slipping behavior) in the Hertz model for a clump in PFC3D Version 7, other than by increasing the friction coefficient? --- ## [Error in using block insitu command in UDEC to model topography stress including overburden](https://forum.itascainternational.com/t/error-in-using-block-insitu-command-in-udec-to-model-topography-stress-including-overburden/859)
**Author:** [@Binu](https://forum.itascainternational.com/u/Binu)\ **Replies:** 5\ **Last updated:** [December 17, 2022, 2:20am UTC](https://forum.itascainternational.com/t/error-in-using-block-insitu-command-in-udec-to-model-topography-stress-including-overburden/859 "2022-12-17T02:20:58Z")
I am getting error in generating initial stress field in a UDEC model using the “block insitu stress-topography” -command. While using command I got error block insitu stress-topography kox 1.0 koz 1.0 koy 1 yup overbu… --- ## [FLAC GUI sys error](https://forum.itascainternational.com/t/flac-gui-sys-error/794)
**Author:** [@jwang](https://forum.itascainternational.com/u/jwang)\ **Replies:** 0\ **Last updated:** [October 24, 2022, 9:33pm UTC](https://forum.itascainternational.com/t/flac-gui-sys-error/794 "2022-10-24T21:33:40Z")
In FLAC, you may get a GUI error saying ‘\> sys cd ‘C\\Program Files \\Itasca\\FLAC810’ ; $ Missing quote at end of command line’ and then unable to work on GUI. There are two ways to fix this: Option 1: Go to FLAC ins… --- ## [Assigning different contact properties/ - models to seperate walls in one model](https://forum.itascainternational.com/t/assigning-different-contact-properties-models-to-seperate-walls-in-one-model/677)
**Author:** [@Mussie](https://forum.itascainternational.com/u/Mussie)\ **Replies:** 12\ **Last updated:** [October 16, 2022, 11:54am UTC](https://forum.itascainternational.com/t/assigning-different-contact-properties-models-to-seperate-walls-in-one-model/677 "2022-10-16T11:54:39Z")
Hi everyone, I am stuck with a rather basic question. How can I define different contact - properties - for different walls within a model and how can I define different contact - models - for different walls within a… --- ## [Restore grid configuration after ini disp (0,0,0)](https://forum.itascainternational.com/t/restore-grid-configuration-after-ini-disp-0-0-0/688)
**Author:** [@juantello](https://forum.itascainternational.com/u/juantello)\ **Replies:** 2\ **Last updated:** [August 1, 2022, 8:58pm UTC](https://forum.itascainternational.com/t/restore-grid-configuration-after-ini-disp-0-0-0/688 "2022-08-01T20:58:45Z")
Hello, I am modeling an excavation inside diaphragm walls in which some bottom upheave occurs. This deforms the grid at excavation bottom somewhat. Typically, I use this face to create a shell with the create-by-face ke… --- ## [Gateway error: no available seats for this license](https://forum.itascainternational.com/t/gateway-error-no-available-seats-for-this-license/683)
**Author:** [@juantello](https://forum.itascainternational.com/u/juantello)\ **Replies:** 5\ **Last updated:** [August 1, 2022, 5:08pm UTC](https://forum.itascainternational.com/t/gateway-error-no-available-seats-for-this-license/683 "2022-08-01T17:08:42Z")
Hello, Often when working in FLAC3D, after running a few data files, I tend to run into the following error: This happens sometimes when I execute lines within a data file with the Cntrl+Shift+E command. It takes a… --- ## [Useful Rhino 7 commands to work with engineering models](https://forum.itascainternational.com/t/useful-rhino-7-commands-to-work-with-engineering-models/512)
**Author:** [@apyatigorets](https://forum.itascainternational.com/u/apyatigorets)\ **Replies:** 2\ **Last updated:** [May 16, 2022, 6:04am UTC](https://forum.itascainternational.com/t/useful-rhino-7-commands-to-work-with-engineering-models/512 "2022-05-16T06:04:33Z")
Rhino has very large set of commands to operate on 3D geometries. The full list can be found here: Command Quick Reference | Rhino 3-D modeling The pdf document attached here outlines Rhino commands that are very often … --- ## [Blocks unjoining when making a cut](https://forum.itascainternational.com/t/blocks-unjoining-when-making-a-cut/96)
**Author:** [@jhazzard](https://forum.itascainternational.com/u/jhazzard)\ **Replies:** 1\ **Last updated:** [May 7, 2022, 2:52pm UTC](https://forum.itascainternational.com/t/blocks-unjoining-when-making-a-cut/96 "2022-05-07T14:52:16Z")
Sometimes you will find that blocks become unjoined when you make a cut in 3DEC. This is because joined blocks must make a contiguous volume. See figure below. Imagine 3 joined blocks. You wish to create a true joint… --- ## [Voronoi in 3DEC 5.2](https://forum.itascainternational.com/t/voronoi-in-3dec-5-2/422)
**Author:** [@Akash77skyz](https://forum.itascainternational.com/u/Akash77skyz)\ **Replies:** 17\ **Last updated:** [May 4, 2022, 9:48am UTC](https://forum.itascainternational.com/t/voronoi-in-3dec-5-2/422 "2022-05-04T09:48:11Z")
Hello everyone. Can anyone tell me whether we can use or create Voronoi elements in 3DEC 5.2 and show minor fractures? In my case I have to simulate a cylindrical specimen with very small Voronoi elements for the UCS tes… --- ## [Negative or zero block volume](https://forum.itascainternational.com/t/negative-or-zero-block-volume/95)
**Author:** [@jhazzard](https://forum.itascainternational.com/u/jhazzard)\ **Replies:** 5\ **Last updated:** [May 2, 2022, 8:17am UTC](https://forum.itascainternational.com/t/negative-or-zero-block-volume/95 "2022-05-02T08:17:30Z")
In large strain, you may an error message in 3DEC, “negative or zero block volume”. This is caused by the collapsing of very thin blocks or zones in large strain. There are several ways to deal with this: Run in sma… --- ## [FLAC2D Launch Upcoming](https://forum.itascainternational.com/t/flac2d-launch-upcoming/439)
**Author:** [@dajwahl](https://forum.itascainternational.com/u/dajwahl)\ **Replies:** 5\ **Last updated:** [April 13, 2022, 7:15pm UTC](https://forum.itascainternational.com/t/flac2d-launch-upcoming/439 "2022-04-13T19:15:09Z")
Just saw that FLAC will be phased out and a new replacement called FLAC2D is going to be launched shortly. Will all CPPUDMs already compiled for FLAC have to be recompiled for FLAC2D? In particular we use PM4Sand and P… --- ## [FLAC3D v7.141 speed - CPU wave behavior](https://forum.itascainternational.com/t/flac3d-v7-141-speed-cpu-wave-behavior/102)
**Author:** [@ccancino](https://forum.itascainternational.com/u/ccancino)\ **Replies:** 8\ **Last updated:** [January 31, 2022, 8:27pm UTC](https://forum.itascainternational.com/t/flac3d-v7-141-speed-cpu-wave-behavior/102 "2022-01-31T20:27:22Z")
Is anyone familiar with this kind of “wave” behavior? FLAC3D is only using about 40% of CPU resources due to this “wave” behavior. I have done few tests, concluding that it’s not related to fish-calls, and I have also… --- ## [Out of Memory Java related error](https://forum.itascainternational.com/t/out-of-memory-java-related-error/107)
**Author:** [@jwang](https://forum.itascainternational.com/u/jwang)\ **Replies:** 0\ **Last updated:** [September 21, 2021, 9:50pm UTC](https://forum.itascainternational.com/t/out-of-memory-java-related-error/107 "2021-09-21T21:50:15Z")
The following Java error may show up when running very large model with many history plots created in GUI To fix this issue, in FLAC8.1 just go to File-\>Memory settings, increase the GUI memory.: In FLAC8 and previ… --- ## [Use z\_model(),z\_prop() and z\_group(). to access model and properties](https://forum.itascainternational.com/t/use-z-model-z-prop-and-z-group-to-access-model-and-properties/106)
**Author:** [@jwang](https://forum.itascainternational.com/u/jwang)\ **Replies:** 0\ **Last updated:** [September 21, 2021, 9:13pm UTC](https://forum.itascainternational.com/t/use-z-model-z-prop-and-z-group-to-access-model-and-properties/106 "2021-09-21T21:13:59Z")
1.To access CPP (CPP built-in and CPPUDM) models and their properties: Use: z\_model() to return or modify model name. e.g. if z\_model(i,j)=‘finn’ z\_prop() to access property name. e.g. \_fric=z\_prop(i,j,‘friction’) T…