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**mu****Member**- Registered: 2021-12-03
- Posts: 32

Hello,

I've observed an unexpected heat shock in my transient thermal analysis .

Initial temperature of two solids: 30 、10

When time is less than 50 senconds, the max temperature is bigger than 30.

I have tried to use 3D_DIAG modelisation, but heat shock still exist.

I simulate the model with SolidWorks and I get a correct result without heat shock .

Salome result

SolidWorks result

*Last edited by mu (2021-12-10 08:17:50)*

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Hi, for thermal shock applications it is recommended to use 3D_DIAG elements, as its known that full integration elements have the tendency to cause numerical oscillations in the temoerature.

See for ecxample in the training materials here Slide 8:

https /www.code-aster.org/V2/UPLOAD/DOC/Formations/06-thermal_analysis.pdf

Best,

Richard

Richard Szoeke-Schuller

Product Management

www.simscale.com

We are hiring! https://www.simscale.com/jobs/

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**mu****Member**- Registered: 2021-12-03
- Posts: 32

SolidWorks result

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**mu****Member**- Registered: 2021-12-03
- Posts: 32

Hi, Richard

I have tried to use 3D_DIAG, but heat shock still exist.

RichardS wrote:

Hi, for thermal shock applications it is recommended to use 3D_DIAG elements, as its known that full integration elements have the tendency to cause numerical oscillations in the temoerature.

See for ecxample in the training materials here Slide 8:

https /www.code-aster.org/V2/UPLOAD/DOC/Formations/06-thermal_analysis.pdfBest,

Richard

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Ok, t

hen you can try with a smaller time step or fully implicit time integration (theta=1, default is 0.57).

Best,

Richard

Richard Szoeke-Schuller

Product Management

www.simscale.com

We are hiring! https://www.simscale.com/jobs/

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**Volker****Member**- From: Chemnitz
- Registered: 2016-05-23
- Posts: 92

Have you already tested a modelling without using LIAISON_MAIL?

I mean you have only one "real" solid and two zones of solid elements...

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**mu****Member**- Registered: 2021-12-03
- Posts: 32

Hi, Richard

Thanks for your help that solved my problem!

my solution:

theta: 0.65+ , timestep 0.5s-

RichardS wrote:

Ok, t

hen you can try with a smaller time step or fully implicit time integration (theta=1, default is 0.57).Best,

Richard

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**mu****Member**- Registered: 2021-12-03
- Posts: 32

Yes, I did.

Just like you said, LIAISON is not necessary, but it is not the problem.

Thank you all the same.

Volker wrote:

Have you already tested a modelling without using LIAISON_MAIL?

I mean you have only one "real" solid and two zones of solid elements...

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