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#1 2019-11-13 08:55:14

fabian0989
Member
Registered: 2019-11-08
Posts: 6

Nonlinear Simulation of Shell Structure

Hello, everybody,
I'm in the process of calculating a shell structure under pressure. The simulation is also running, but the calculation time is very long. If I calculate the same model in Abaqus with the element type S4R the analysis takes about 4 minutes. In Code Aster the same simulation takes more than an hour.
Am I doing something wrong, or are the algorithms in Abaqus simply more efficient? I would be very grateful for tips.
The files of the simulation are attached.

Greetings Fabian
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Windows 10
Salome-Meca 2019


Attachments:
Core.zip, Size: 182.77 KiB, Downloads: 62

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#2 2019-11-15 17:53:23

jeanpierreaubry
Guru
From: nantes (france)
Registered: 2009-03-12
Posts: 3,638

Re: Nonlinear Simulation of Shell Structure

hello

are you sure you run the same problem
in code_aster it fails on the first step of the calculation

i think your problem is ill defined
do you understand all the commands in the .comm file

also the mesh is unduly fine

jean pierre aubry


consider reading my book
freely available here https://framabook.org/beginning-with-code_aster/

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#3 2019-11-16 13:41:24

fabian0989
Member
Registered: 2019-11-08
Posts: 6

Re: Nonlinear Simulation of Shell Structure

Hello jean pierre aubry,

I'm surprised the model doesn't work for you. I've just tested it again and it's starting to work for me (see attached file - i aborted it manually after startup).
I'm still a beginner with Code_Aster but already have a lot of experience with FEM (Abaqus/LSDyna/Optistruct). It would be nice if you could tell me what you think is wrong in the *.comm file - that was the question.
The mesh size may be very small, but it was validated in Abaqus by a mesh convergence study. Independently of this, I also ran the model with a coarser net in Code_Aster, which leads to much longer simulation times than in Abaqus or LSDyna.


Attachments:
Code_Aster_Out.txt, Size: 53.87 KiB, Downloads: 336

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#4 2019-12-05 14:26:29

fabian0989
Member
Registered: 2019-11-08
Posts: 6

Re: Nonlinear Simulation of Shell Structure

Is there nobody who can help me? I'm gratefule for any feedback.

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#5 2019-12-05 17:42:24

corra
Banned
Registered: 2008-06-03
Posts: 143

Re: Nonlinear Simulation of Shell Structure

Maybe you could find it useful to have a look to the document u1.03.03? I also found interesting the document 05-code_aster_hpc-nonlinear.pdf in the training section.

Regards,

Corrado

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