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#1 Re: Salome-Meca usage » Location of "mtlp100a.66" (CCT Diagram) salome 2019 for windows » 2021-11-15 22:30:48

Hi,

For test case files, you need to download the source code of code-aster (Not salome-meca) and do the following:

1.extract the downloaded archive
2. go to SRC folder
3. Extract the aster-version.no.tgz archive (e.g. aster-14.6.0.tgz or similar)
4. You will get a folder named "astest" after this extraction.
5. You will find all the files related to every test case in the "astest" folder

Best regards

Sukumar

#2 Re: Introduce yourself / Présentez vous » Bonjour, Cyprien here » 2021-11-14 20:08:44

Hi Cyprien,

Welcome. It's great to have you here. Hope to have active interaction here, within this very helpful and vibrant community.

Regards

Sukumar

#3 Re: Salome-Meca installation » Salome-Meca 2021: Download fails » 2021-11-02 23:47:37

Dear All,

Since it was released, the SM-2021 container download fails repeatedly, and manual restart seems to be the only option, whether downloaded in browser or using wget. Download stops at about every 100MB or so. Hope developers would look into the  server issue soon. However, one good news: there is another container (Courtesy Mario and Nicola) at

https: //github.com/emefff/Code-Aster-MPI-in-Singularity-of-SM2021.

The advantages are:
1. Download is blazing fast
2. One gets MPI version of Code-aster (with PETSC) in addition to the default stable and old-stable versions.

Note that the container needs to be renamed after download as discussed in
https:__//code-aster.org/forum2/viewtopic.php?id=25956&p=2

Best regards

Sukumar

#4 Re: Salome-Meca installation » Questions about singularity version of salome_meca 2021 » 2021-10-19 13:52:43

nicola wrote:

with the 16 october 2021 update  ... you can install petsc for 15.4.0 .... ( --disable-petcs is no more necessary ).
The mpi prerequisites have been update.

Thanks a lot for this new version with PETSC enabled.

mf wrote:

I also updated the container that can be downloaded there

Thanks a lot, Mario, for this modified container with CA-mpi. Also lots of thanks for your step-wise tutorial. It's a great contribution to the community. We had struggled a lot for mpi with earlier CA versions. Decision to use container is really a wise one, I feel.

Presently I am downloading your container and waiting eagerly to try it.

Best regards

Sukumar

#5 Re: Salome-Meca installation » MPI version in container » 2021-10-18 20:57:49

Hi,

Please see the following post in this forum, particularly post #28.

HTTPS_//www.code-aster.org/forum2/viewtopic.php?id=25956&p=2

This gives detailed procedure to install MPI version in the container. (Courtesy Mario).

Regards

Sukumar

#6 Re: Salome-Meca installation » [SOL]Problem in launching ASTER-STUDY Module in Salome-Meca-2021(.sif) » 2021-10-11 23:03:02

Dear All,

Thanks a lot to mathieu.courtois and APereira

Following the advice of mathieu.courtois , the problem stands resolved now.

The solution is described in  /forum2/viewtopic.php?id=25980 #3 and #5

Posting here as it might help some user like me in future..

Thanks a lot to all.

With warm regards

Sukumar

#7 Re: Code_Aster installation » [SOL]Problem in launching ASTER-STUDY Module in Salome-Meca-2021(.sif) » 2021-10-11 22:48:26

mathieu.courtois wrote:

singularity run --app install salome_meca-lgpl-2021.0.0-1-20210811-scibian-9.sif

Then, start salome_meca using the extracted script named `salome_meca-lgpl-2021.0.0-1-20210811-scibian-9`.

Dear Mathieu and APereira,

Thanks a lot for your quick replies.
I followed the instructions of Mathieu

  cd <path to salome_meca-lgpl-2021.0.0-1-20210811-scibian-9.sif>
singularity run --app install salome_meca-lgpl-2021.0.0-1-20210811-scibian-9.sif
 ./salome_meca-lgpl-2021.0.0-1-20210811-scibian-9
 
 

And, it worked like miracle, after some initial glitches in the Aster-Study Module.

However, I continue to get the message of GL-Error (as shown in my initial post) in the terminal launching S-Meca-2021.0.0

I am marking this post as [SOLVED] and attaching a screen-shot of a running instance.

BTW, how to change the default language to 'EN'?

Thanks once again to Mathieu and APereira.

With warm regards.

Sukumar

#8 Code_Aster installation » [SOL]Problem in launching ASTER-STUDY Module in Salome-Meca-2021(.sif) » 2021-10-09 20:52:38

sb1966
Replies: 11

Dear All,

I am facing problems in Launching Aster_Study module in Salome-Meca 2021.0.0 (singularity container). The details are described below:

1. I have installed singularity version 3.5.3 from source in Ubuntu 18.04 following the procedure as described in
  https COLON SLASH SLASH singularity-tutorial.github.io/01-installation/
2. The singularity seems to run perfectly. I have tested it as described in
https COLON SLASH SLASH singularity-tutorial.github.io/02-basic-usage/
3a. Then I used "run" command to run the salome-meca 2021.0.0 (singularity container). Note that I have checked the md5sum of the downloaded .sif file and found OK
3b.  Used the following command for (3a):

 singularity run salome_meca-lgpl-2021.0.0-1-20210811-scibian-9.sif 

4a. The salome-meca seems running well in GEOM and MESH module. Tested it by openning old hdf files generated using salome-mec-2019.0.3 version. The output obtained in the terminal  (step 3b) is as follows:
     

 
     sukumar@sukumar-H110M-S2PH:~/Downloads/SMeca_2021$ singularity run salome_meca-lgpl-2021.0.0-1-20210811-scibian-9.sif 
*****************************************************
INFO : Running salome_meca in software rendering mode
*****************************************************
runSalome running on sukumar-H110M-S2PH
Searching for a free port for naming service: 2810 - OK
Searching Naming Service  + found in 0.1 seconds 
Searching /Kernel/Session in Naming Service  ++++++++ found in 4.0 seconds 
Start SALOME, elapsed time :   4.4 seconds
****************************************************************
     Warning: module GHS3DPLUGIN is improperly configured!
     Module GHS3DPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module GHS3DPRLPLUGIN is improperly configured!
     Module GHS3DPRLPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module BLSURFPLUGIN is improperly configured!
     Module BLSURFPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module NETGENPLUGIN is improperly configured!
     Module NETGENPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module HYBRIDPLUGIN is improperly configured!
     Module HYBRIDPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module GMSHPLUGIN is improperly configured!
     Module GMSHPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module HexoticPLUGIN is improperly configured!
     Module HexoticPLUGIN will not be available in GUI mode!
****************************************************************

4b. However, whenever I try to start ASTER-STUDY module, it gives me the following error:

 Mesa: User error: GL_INVALID_OPERATION in glBlitFramebuffer(depth attachment format mismatch)
Mesa: 1 similar GL_INVALID_OPERATION errors
Mesa: User error: GL_INVALID_OPERATION in unsupported function called (unsupported extension or deprecated function?)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_ALPHA_TEST)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_LIGHTING)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_TEXTURE_1D)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_TEXTURE_2D)
Mesa: User error: GL_INVALID_OPERATION in unsupported function called (unsupported extension or deprecated function?)
Mesa: 7 similar GL_INVALID_OPERATION errors
Mesa: User error: GL_INVALID_ENUM in glEnable(GL_ALPHA_TEST)
Mesa: User error: GL_INVALID_ENUM in glEnable(GL_LIGHTING)
Mesa: User error: GL_INVALID_ENUM in glEnable(GL_TEXTURE_1D)
Mesa: User error: GL_INVALID_ENUM in glEnable(GL_TEXTURE_2D)
Mesa: User error: GL_INVALID_OPERATION in unsupported function called (unsupported extension or deprecated function?)
Mesa: 5 similar GL_INVALID_OPERATION errors
Mesa: User error: GL_INVALID_OPERATION in glBlitFramebuffer(depth attachment format mismatch)
Mesa: User error: GL_INVALID_OPERATION in unsupported function called (unsupported extension or deprecated function?)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_ALPHA_TEST)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_LIGHTING)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_TEXTURE_1D)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_TEXTURE_2D)

5. The above message keeps on repeating for large numbers of times.
6. The screen-shot of the Aster-Study module is also attached for kind perusal.

7. Please help to figure out the issue. My host OS (Ubuntu 18.04LTS) is otherwise running fine. I have installed all mesa pre-requisites.

Note that I do not have any GPU in my box and it uses built-in intel display:
-OpenGL-
Vendor        : Intel Open Source Technology Center
Renderer        : Mesa DRI Intel(R) HD Graphics 630 (KBL GT2)
Version        : 3.0 Mesa 20.0.8
Direct Rendering        : Yes

Looking forward to listen from learned community members.

With warm regards.

Sukumar

#9 Salome-Meca installation » [SOL]Problem in launching ASTER-STUDY Module in Salome-Meca-2021(.sif) » 2021-10-09 20:40:47

sb1966
Replies: 1

Dear All,

I am facing problems in Launching Aster_Study module in Salome-Meca 2021.0.0 (singularity container). The details are described below:

1. I have installed singularity version 3.5.3 from source in Ubuntu 18.04 following the procedure as described in
https COLON SLASH SLASH singularity-tutorial.github.io/01-installation/

2. The singularity seems to run perfectly. I have tested it as described in
https COLON SLASH SLASH singularity-tutorial.github.io/02-basic-usage/

3a. Then I used "run" command to run the salome-meca 2021.0.0 (singularity container). Note that I have checked the md5sum of the downloaded .sif file and found OK
3b.  Used the following command for (3a):

 singularity run salome_meca-lgpl-2021.0.0-1-20210811-scibian-9.sif 

4a. The salome-meca seems running well in GEOM and MESH module. Tested it by openning old hdf files generated by salome-meca-2019.0.3 version. The output obtained in the terminal (in step 3b) is as follows:
   

 
     sukumar@sukumar-H110M-S2PH:~/Downloads/SMeca_2021$ singularity run salome_meca-lgpl-2021.0.0-1-20210811-scibian-9.sif 
*****************************************************
INFO : Running salome_meca in software rendering mode
*****************************************************
runSalome running on sukumar-H110M-S2PH
Searching for a free port for naming service: 2810 - OK
Searching Naming Service  + found in 0.1 seconds 
Searching /Kernel/Session in Naming Service  ++++++++ found in 4.0 seconds 
Start SALOME, elapsed time :   4.4 seconds
****************************************************************
     Warning: module GHS3DPLUGIN is improperly configured!
     Module GHS3DPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module GHS3DPRLPLUGIN is improperly configured!
     Module GHS3DPRLPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module BLSURFPLUGIN is improperly configured!
     Module BLSURFPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module NETGENPLUGIN is improperly configured!
     Module NETGENPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module HYBRIDPLUGIN is improperly configured!
     Module HYBRIDPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module GMSHPLUGIN is improperly configured!
     Module GMSHPLUGIN will not be available in GUI mode!
****************************************************************
****************************************************************
     Warning: module HexoticPLUGIN is improperly configured!
     Module HexoticPLUGIN will not be available in GUI mode!
****************************************************************

4b. However, whenever I try to start ASTER-STUDY module, it gives me the following error:

 Mesa: User error: GL_INVALID_OPERATION in glBlitFramebuffer(depth attachment format mismatch)
Mesa: 1 similar GL_INVALID_OPERATION errors
Mesa: User error: GL_INVALID_OPERATION in unsupported function called (unsupported extension or deprecated function?)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_ALPHA_TEST)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_LIGHTING)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_TEXTURE_1D)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_TEXTURE_2D)
Mesa: User error: GL_INVALID_OPERATION in unsupported function called (unsupported extension or deprecated function?)
Mesa: 7 similar GL_INVALID_OPERATION errors
Mesa: User error: GL_INVALID_ENUM in glEnable(GL_ALPHA_TEST)
Mesa: User error: GL_INVALID_ENUM in glEnable(GL_LIGHTING)
Mesa: User error: GL_INVALID_ENUM in glEnable(GL_TEXTURE_1D)
Mesa: User error: GL_INVALID_ENUM in glEnable(GL_TEXTURE_2D)
Mesa: User error: GL_INVALID_OPERATION in unsupported function called (unsupported extension or deprecated function?)
Mesa: 5 similar GL_INVALID_OPERATION errors
Mesa: User error: GL_INVALID_OPERATION in glBlitFramebuffer(depth attachment format mismatch)
Mesa: User error: GL_INVALID_OPERATION in unsupported function called (unsupported extension or deprecated function?)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_ALPHA_TEST)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_LIGHTING)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_TEXTURE_1D)
Mesa: User error: GL_INVALID_ENUM in glDisable(GL_TEXTURE_2D)

5. The above message keeps on repeating for large numbers of times.

6. The screen-shot of the Aster-Study module is also attached for kind perusal.

7. My host OS (Ubuntu 18.04LTS) is otherwise running fine. I have installed all mesa pre-requisites.

Note that I do not have any GPU in my box and it uses built-in intel display:
-OpenGL-
Vendor        : Intel Open Source Technology Center
Renderer        : Mesa DRI Intel(R) HD Graphics 630 (KBL GT2)
Version        : 3.0 Mesa 20.0.8
Direct Rendering        : Yes
.

Please help to figure out the issue.
Looking forward to listen from the learned community members.

With warm regards.

Sukumar

#10 Re: Salome-Meca installation » Questions about singularity version of salome_meca 2021 » 2021-10-04 21:41:28

sameer21101970 wrote:

Request Experts at Code Aster.
Kindly Make a Video Tutorial on Installation. Lot of Queries will get solved.

1. Aptly said by sameer21101970.
2. Hope, the developers/experts (within/outside EDF) would help us soon in the installation process.
3. This is necessary since many of us here, like me, are engineers with no formal training in IT or software engineering.
4.  The container being very new, we do need professional help to get initiated.

Hope to listen from the moderator/experts soon.

With Best Regards

Sukumar

#11 Re: Code_Aster usage » Harmonic analysis with both Rayleigh and Hysteresis dampings » 2021-09-17 23:35:47

aep93 wrote:

Is it correct to have both in Rayleigh and Hysteresis dampings at the same time in a harmonic analysis?

Hi,

1. Yes, AFAIK, in principle you may use both Hysteretic and Rayleigh Damping, so far as Code-aster is concerned. However, the physical meaning of these two types of damping are not the same. Rayleigh damping ultimately depends on the excitation Frequency and hence preferred in modelling the MODAL damping ratio in Structural Analysis.

2. However, if you are modelling semi-infinite media like soil (halfspace) then Rayleigh damping may be used (with carefully chosen values of ALPHA and BETA) to model the hysteretic/ material damping of soil. On the other hand discrete element may be used to model the Radiation damping of the halfspace.

3. So, in a nut-shell, it depends on what you want to model.

Hope this helps.

Best wishes

#12 Re: Salome-Meca usage » Utilisation du multicœurs dans SALOME_MECA ? » 2021-09-16 17:46:53

Hi,

Happy to learn that my reply was helpful to you.

I am sorry for my inadvertent, yet delayed response..

Best regards and Best wishes

Sukumar

#13 Re: Salome-Meca usage » Utilisation du multicœurs dans SALOME_MECA ? » 2021-09-07 23:34:06

Luc_Parise wrote:

Existe-t-il une méthode pour faire tourner les calculs de code_aster via SALOME_MECA en multicœurs ?

Hi,
You need to install Code-aster-MPI to use Multicore/multi-thread.

Ou est-il obligatoire de passer par l’interface ASTK de code_aster ?

If you have code-aster MPI version installed you can use ASTK or Salome-Meca Interface, which ever you prefer.

Si oui, cette interface est-elle accessible depuis la version Windows de SALOME_MECA ?

1. The MPI version of code-aster for windows is non-free. Also in the latest Windows version of Salome-Meca (i.e. 2019) or Code-aster 14.4 (Windows), ASTK interface is not available.
2. You need to execute "as_run.bat" after preparing the export file manually.
3. There is another tool "as_run_launcher" in the Code-aster (Windows version) which you might try to generate your export file ( I have no much experience with that, although !)

Best regards

Sukumar

#14 Re: Salome-Meca installation » [Solved] Issue launching Salome-Meca 2020 on ubuntu 18.04 » 2021-08-31 19:58:32

Dear msh,

msh wrote:

@sb1966, thanks you, but I can't resolve my problems from topic named "Can't run SM v. 2020.0.1-1-un. in Debian Linux v.9-based OS" and after all I was choose SM v. 2019.3, because I don't have the same problems with SM v. 2019.3.

Thanks for your info.

I think, SM 2020 version has been troublesome for many users including some experts. There are Forum posts requesting newer release of SM 2020 and people have reverted back to 2019.0.3 for the time being. I hope it will be resolved soon. I posted a question to the developers regarding this (viewtopic.php?id=25788); however, it has not attracted any reply so far.

Presently I am also using SM 2019.0.3  in Ubuntu 18.04. I think, it is quite good a version..

Another reason to stick to Ubuntu 18.04 is that Ubuntu 20.04 has some bug related to $\LaTeX$ also. This has delayed upgrading to Ubuntu 20.04 for many users, including me. neutral

Best regards.

Sukumar

#15 Re: Salome-Meca installation » [Solved] Issue launching Salome-Meca 2020 on ubuntu 18.04 » 2021-08-10 14:52:50

Hi,

The following may help, although I am not sure:

Please try the point No 9 in post #20 of ____/forum2/viewtopic.php?id=24883.


Best wishes
Sukumar

#16 Re: Salome-Meca installation » Installation on Ubuntu 20.04 » 2021-07-23 21:28:10

Hi,

This worked for me installing SM 2020.0.1 on Ubuntu 20.04. Thank you!

Happy to know that the same procedure has worked for SM 2020.0.1 also.

Best regards.

Sukumar

#17 Re: Code_Aster usage » Error in Run_Case with UMAT » 2021-07-08 17:22:09

Hi,

The following might be of your help:

H___PS://feaforall.com/add-material-behavior-law-code_aster/

Also you may explore MFRONT interface for code-aster. You may search with keyword MFRONT in this forum.

Hope this helps.

Best wishes

Sukumar

#18 Salome-Meca installation » Salome-Meca 2020 in Singularity Containers: Present Status? » 2021-07-06 23:08:46

sb1966
Replies: 1

Dear Developers,

The forum post (__forum2/viewtopic.php?id=25473) mentioned about providing Salome-meca 2020 in Singularity Container (at present, for beta testing).

I would like to know the present status of the same. I suppose, that's the reason for only one release of SM2020 till now.

Best regards.

Sukumar

#19 Re: Salome-Meca usage » Create a geometry from .txt file » 2021-07-06 15:00:39

Hi,

You can use the Salome-Geom or Salome-Shaper Module to create your geometry in the Salome-Meca itself and then use Mesh module to create the mesh. There are very good tutorials in the YouTube for beginners as well. Some of them I recommend are "feaforall", "Digvijay Patankar" and "FEA with FLOSS". Alternatively you can use gmsh which is another free and light weight but powerful meshining program (W__gmsh/info) where you can also generate the geometry and then mesh it. Again there are many video tutorials on gmsh in YouTube including in the last channel mentioned above. For using gmsh you may also refer to the only Book on Code-aster by J. P. Aubry which is an excellent book, freely available at  H__PS://framabook.org/beginning-with-code_aster/ (Please correct the urls appropriately as I am not allowed to enter url here).

If you are interested to write your mesh file manually, that is also possible, by following the ASTER format. I am enclosing an ASTER mesh of a homogeneous slope, having 3-noded Triangular Elements (TRIA3). You may refer to Code-Aster Documentation U3.01.00 for details of the file format. But for realistic projects, that won't be convenient and may be error prone, I suppose.

Best wishes in your journey with this wonderful and powerful but absolutely free software Salome-Meca/Code-Aster.

Sukumar

#20 Re: Code_Aster usage » CalculiX vs Code-Aster » 2021-06-15 23:44:30

Hi,

Nice to know that you are moving towards Free-Libre software world.

Some differences between CalculiX and Code-aster, I could list at this moment are:

1. Code-aster has been in use in real world industrial applications in the complex field of nuclear engineering for about 35 years,
2. It has the benefit of this huge field application experience,
3. Thousands of validation cases, every new version must pass through, before it is released,
4. Huge documentation which is exceptional compared to most other opensource softwares.

(CONS: For Non-French speaking users like me, the machine translated documents are very often nightmares. Thanks to Google Translate that our lives are reasonably manageable these days).
5. Large and very supportive user community.
6. Of late, there have been quite a number of good tutorial videos becoming available in YouTube. In addition, a very good English book by one of the Code-Aster Gurus- J. P Aubry (  https [colon slash slash] framabook.org/beginning-with-code_aster/) is freely available to beginners or intermediate users.

Hope this partly addresses  your query.

Sukumar

#21 Re: Introduce yourself / Présentez vous » Greetings from India ! » 2021-06-15 23:41:54

Hi,

Nice to know that you are moving towards Free-Libre software world.

Some differences between CalculiX and Code-aster, I could list at this moment are:

1. Code-aster has been in use in real world industrial applications in the complex field of nuclear engineering for about 35 years,
2. It has the benefit of this huge field application experience,
3. Thousands of validation cases, every new version must pass through, before it is released,
4. Huge documentation which is exceptional compared to most other opensource softwares.

(CONS: For Non-French speaking users like me, the machine translated documents are very often nightmares. Thanks to Google Translate that our lives are reasonably manageable these days).

5. Large and very supportive user community.
6. Of late, there have been quite a number of good tutorial videos becoming available in YouTube. In addition, a very good English book by one of the Code-Aster Gurus- J. P Aubry (  https [colon slash slash] framabook.org/beginning-with-code_aster/) is freely available to beginners or intermediate users.

Hope this partly addresses  your query.

Sukumar

#22 Re: Salome-Meca usage » I NEED YOUR HELP CANT RUN SALOME v 9.6.0 » 2021-05-31 23:34:42

Hi,
I hope you are aware that Salome (W__.salome-platform.org) is a different product than Salome-Meca.  Salome-Meca is basically a graphical FEA suite which uses Salome for pre processing, Code-aster as the FE Solver and Paraview for Post processing.  If you are interested to do the FE simulation only through Code-Aster, then you may be interested in the former. Else, you should use Salome-Meca. The windows version is at HTTPS:/\code-aster-windows.com.
Hope this helps.

Sukumar

#23 Re: Code_Aster usage » Modal analysis of a beam with elastic boundary condition » 2021-05-08 09:29:30

Hi,

The following is based on your mess file output.
The mess file says that you have rigid body modes. Possibly your model is not constrained enough. You may recheck your boundary conditions.

Hope this helps.

Regards

Sukumar

#24 Re: Code_Aster development » Possibility of Cloud-based Service around Code-Aster » 2021-03-27 21:45:27

Hi,
Thanks a lot for sharing the information. I will explore the same.

Best regards

Sukumar

#25 Re: Code_Aster usage » Simulation deleting elements » 2021-03-21 14:41:31

Hi Julian,

The idea in CA is to use the same mesh but different model in each analysis in the step-wise removal of elements.

You may define separate groups (GROUP_MA) for the elements to be removed at each step of removal. For example, if you have to remove elements in 3 consecutive steps, then you need to define the following models:

mo0= Full model
mo1=Full model minus the first group of elements to be removed in the first removal step.

And so on..

Then project the stresses (or any other field of interest) from the first model to the 2nd model by using PROJ_CHAMP operator.
Then carry out analysis of the second model with the initial condition (ETAT_INIT) corresponding to the projected stress etc.

Also at every removal step, you need to find the REAC_NODA at the nodes of interface of the two models and gradually withdraw them in subsequent analysis.

To understansd the steps fully, you may refer to Validation Document V3.02.105 and see the comm files for the test case sslp105.

Hope this helps.

Best regards

Sukumar