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Could you please explain the reason why slave surface mesh has to be finer then that of master?
maybe this
code-aster.org/doc/default/en/man_u/u2/u2.04.04.pdf (copy and paste in your browser)
from 2.2.3 Case general
to 2.2.7 Quality of the grid
Last edited by mib (2020-10-22 10:37:31)
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It is converging, do below.
Make Sphere (ball)Mesh Fine.
Reduce Time Step to 100
Sammer, how small was the ball mesh size in your setting?
I ended up using this setting:
[ball = 0.1; substrate = 2.5] & number of time steps = 100
But even with this master-to-slave mesh size ratio in 1:2.5, it still gave out convergence issue.
I have attached the log of this latest trial FYI.
In which there was a multiple occasion of <A> <COMPOR2_9> occurred:
!-----------------------------------------------------------------!
! <A> <COMPOR2_9> !
! !
! Les déformations deviennent trop grandes : <6.382117E-02> !
! => GROT_GDEP sous COMPORTEMENT n'est plus valide. !
! !
! Pour un calcul en !
! grandes déformations !
! il faut utiliser GDEF_LOG ou SIMO_MIEHE. !
! !
! Pour un calcul hyper-élastique, utiliser ELAS_HYPER. !
! !
! !
! This is a warning. If you do not understand the meaning of this !
! warning, you can obtain unexpected results! !
!-----------------------------------------------------------------!
Is it something related to the convergence issue?
I am unable to test further shrinking the ball mesh size for the time being, as somehow Salome-Meca is giving out fatal error whenever loading up the mesh of all previous case files:
Any suggestions other than re-installing Salome-Meca?
maybe this
code-aster.org/doc/default/en/man_u/u2/u2.04.04.pdf (copy and paste in your browser)
from 2.2.3 Case general
to 2.2.7 Quality of the grid
Thanks for the info Mib.
So I suppose this is a hard-coded limitation of CA?
Then this is not a good news for me, because the physics in my case study includes deformation mechanism & local strain hardening effect at the ball / substrate under the same length order.
Are you suggesting that I should look for other simulation tools instead?
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Does your system have Graphic Card.
You need to download sm2019 or use CA 14.4 or now 14.6
You are using Windows version, i am using Linux version.
It is better to do Partition of HardDisk, Download Lubuntu 18.04, Sm2019 Linux Version.
Windows, i am not using because of unexpected errors, as you are getting.
refer salome meca installation forum, installation procedure given.
Last edited by sameer21101970 (2020-11-05 08:52:57)
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Hello,
it is possible to simulate the beginning of the crash of your ball on the plate with Code_Aster but once the distortion of elements gets too high the simulation will stop. You should investigate other ways:
1) Use of linear tetrahedrons can help but it won't be enough anyway.
2) Adaptive meshing would be an option but doesn't exist in Code_Aster. Homard can refine a mesh but not remesh a deformed mesh. Different commercial software handle it.
3) An explicit solver is a good option but I don't know any good opensource ones.
4) SPH could be an option with good opensource codes.
Konyaro
失敗は成功のもと (L'échec est la base de la réussite)
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spheric-sph.org/sph-projects-and-codes
above link for SPH will be helpful.
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