[Kratos] WG: AW: Re: Problems SolidMechanicsApplication

Mini, Andreas andreas.mini en tum.de
Vie Jun 12 14:54:39 CEST 2015



-------------------------------------------------------
Technische Universität München
Lehrstuhl für Statik
Prof. Dr.-Ing. Kai-Uwe Bletzinger
Arcisstr. 21
80333 München

Tel. +49 (0)89 289 22435
Fax +49 (0)89 289 22421
Andreas.Mini at tum.de
www.st.bgu.tum.de
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________________________________
Von: Mini, Andreas
Gesendet: Freitag, 12. Juni 2015 14:13
An: Stefano Zaghi
Betreff: AW: AW: Re: Problems SolidMechanicsApplication


Dear Stefano,


in the attachment you get the example for our second problem. We removed all Empire stuff so that you can solely run it with python. In this file three time steps with 10 iterations each are done. A constant load is applied during those time steps. Thus the displacement should not change. The displacement is printed into the terminal. When using the LargeDisplacementElement the displacement is decreasing which is not correct. If you change to the SmallDisplacement Element in the *.mdpa file you get the correct results. I hope this helps you.


I am looking foreward hearing from you. Thank you so far.


Ciao

Andreas

-------------------------------------------------------
Technische Universität München
Lehrstuhl für Statik
Prof. Dr.-Ing. Kai-Uwe Bletzinger
Arcisstr. 21
80333 München

Tel. +49 (0)89 289 22435
Fax +49 (0)89 289 22421
Andreas.Mini at tum.de
www.st.bgu.tum.de
-------------------------------------------------------
________________________________
Von: Stefano Zaghi <zstefano at cimne.upc.edu>
Gesendet: Donnerstag, 11. Juni 2015 17:23
An: Mini, Andreas
Betreff: Re: AW: Re: Problems SolidMechanicsApplication


Dear Andreas,

 the responsible of the SolidMechanicsApplication is busy now. So, I can help you and it will be better for me if you send me you sample in order to test it by my own.

Regards,

Stefano



Il 2015-06-11 15:23 Mini, Andreas ha scritto:

Dear Stefano,



thank you for your fast answer. This is quite clear to me that there is something wrong in the Solver, the Strategy or the Scheme. The question is, who is responsible for fixing this problem? What about the problem with the eight node hex element?



Ciao

Andreas

-------------------------------------------------------
Technische Universität München
Lehrstuhl für Statik
Prof. Dr.-Ing. Kai-Uwe Bletzinger
Arcisstr. 21
80333 München

Tel. +49 (0)89 289 22435
Fax +49 (0)89 289 22421
Andreas.Mini at tum.de
www.st.bgu.tum.de
-------------------------------------------------------
________________________________
Von: Stefano Zaghi <zstefano at cimne.upc.edu>
Gesendet: Donnerstag, 11. Juni 2015 14:13
An: Mini, Andreas
Betreff: Fwd: Re: Problems SolidMechanicsApplication




-------- Messaggio originale --------

Oggetto:        Re: Problems SolidMechanicsApplication
Data:   2015-06-11 14:12
Mittente:       Riccardo Rossi <rrossi at cimne.upc.edu>
Destinatario:   Stefano Zaghi <zstefano at cimne.upc.edu>



Well yes...but it is perfectly fine to call multiple time the solve...at least it should be fine!!!

Riccardo

On 11 Jun 2015 14:10, "Stefano Zaghi" <zstefano at cimne.upc.edu<mailto:zstefano at cimne.upc.edu>> wrote:

Dear Andreas,

 the problem is that you are calling the structural solver multiple times at the same time step.

Probably the Solver, the Strategy or the Scheme are doing something wrong and for this reason the result is not correct.

Regards,

Stefano Zaghi



Dear colleagues,



I still have some problems with the solid mechanics application. The first one is that the eight node hexaeder elemenent is still not working correctly when using it with the large displacement element.



The second one is also a problem when using the large displacement element with tetrahedra. We are performing a testcase for a co-simulation where in each time step the structure gets a constant load from a dummy fluid. For coupling an Aitken iteration is used. This should converge in the second step for this configuration but it does not and the displacement is decreasing during the iterations. We found out that this has something to do with the restart Solve() function but we are not sure. When using the small displacement element everything works.

Probably one can help us with those problems.



Thank you.



Regards

Andreas Mini
--

Stefano Zaghi

Ph.D. Candidate in Structural Analysis

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--

Stefano Zaghi

Ph.D. Candidate in Structural Analysis

T.(+34) 93 401 64 73

C/ Gran Capità, s/n, Campus Nord UPC, Ed. C1, Despatx C105

08034 - Barcelona - Spain - www.cimne.com



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--

Stefano Zaghi

Ph.D. Candidate in Structural Analysis

T.(+34) 93 401 64 73

C/ Gran Capità, s/n, Campus Nord UPC, Ed. C1, Despatx C105

08034 - Barcelona - Spain - www.cimne.com



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