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**Romans1988****Member**- Registered: 2021-11-08
- Posts: 11

Hi,

i 'am trying to perform a static thermal analisys in a single 3D body (no assembly) with a T imposed in two differents areas and surface Echange Boundary Condition in another.

I am obtaining the following error:

!----------------------------------------------------------------------!

! <EXCEPTION> <MODELISA6_96> !

! !

! les 12478 mailles imprimÃ©es ci-dessus n'appartiennent pas au modÃ¨le !

! et pourtant elles ont Ã©tÃ© affectÃ©es dans le mot-clÃ© facteur : !

! ECHANGE !

!----------------------------------------------------------------------!

" les 12478 mailles" refering to the Echange BC.

Removing the echange boundary the calculation go to result.

I don't understand where is the error. I know that it is in echange BC.

In attachment the data file.

Thanks to al for the answer.

*Last edited by Romans1988 (2022-01-11 17:54:48)*

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**mf****Member**- Registered: 2019-06-18
- Posts: 332

Hello,

the error is in AFFE_MODELE, your face group 'Convection' is not part of the 3D group 'Pump Housing', thus it was not part of the model.

So changing AFFE_MODELE to:

model = AFFE_MODELE(

AFFE=_F(

MODELISATION='3D',

PHENOMENE='THERMIQUE',

TOUT='OUI'

),

MAILLAGE=mesh

)

will do the trick,

Mario.

*Last edited by mf (2022-01-07 15:31:30)*

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**Romans1988****Member**- Registered: 2021-11-08
- Posts: 11

Hi Mario,

it's works. But i don't understand how. The Convection Area is a group of element faces of the 3D model.

Also if i impose a termal load (with ddl_temp) to the convection zone, i obtain the results without any error.

Instead if i use echange BC also to another area (for example in the zone calls T1 or T2) that surface automatically is cut out from the model.

I think that there is something that i don't have understand in the echange BC.

Thanks for the reply.

*Last edited by Romans1988 (2022-01-08 10:25:46)*

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**AsterO'dactyle****Administrator**- Registered: 2007-11-29
- Posts: 421

Hello,

Back to the finite element theory !

See R3.06.02.

ECHANGE is solved by weak approach (integral), you need finite element on skin to make numerical integration

Dirichlet condition (temperature) DDL_TEMP is imposed by strong method, at nodes, without integral, you don't need skin elements

Code_Asterの開発者

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