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#1 2019-11-20 08:21:48

Ashok
Member
Registered: 2019-11-20
Posts: 4

Thermal non line (Iso Mat) with material phase change ?

I am doing the Thermal non line Analysis (Isotropic Material) with material phase change. IN between analysis there is a temp, where my material state changes from POWDER to SOLID. I have attached its graph herewith. Can we able to do such Thermal non line Analysis (including Phase Shift) in code_aster. Your help will be highly appreciated.


Attachments:
LAMBDA.jpg, Size: 45.68 KiB, Downloads: 66

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#2 2019-11-20 10:18:20

Christophe Durand
Nuclear Fuel Division
From: EDF
Registered: 2007-11-22
Posts: 145
Website

Re: Thermal non line (Iso Mat) with material phase change ?

Indeed, Code_Aster can deal with phase transition in thermics. You should take an example on the test case TTNL02 - Transitoire thermique avec changement de phase.

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#3 2019-11-20 15:08:25

Ashok
Member
Registered: 2019-11-20
Posts: 4

Re: Thermal non line (Iso Mat) with material phase change ?

Thanks for the reply.

I have some specific requirement. Can I able to use attached python program in which depending on State of the POWDER or  SOLID I will change the conductivity?

I think the UMAT and MFRONT is not supported for Thermal non linear.

---------- OR ---------------------

I would like to define a State variable at node like NUT1 (= 0 initial value) and depending on the max temp (like above 1336 degree) my powder will change its phase and so NUT1 become 1.0 and depending on these NUT1 value I would like to change my conductivity values.

(Its like handling three values at node)
Temp  K          NUT1
25    9.5175    1
50    10.015    1
75    10.5125    1
100    11.01    1
125    11.5075    1


Temp  K           NUT1
25    0.95175    0
50    1.0015    0
75    1.05125    0
100    1.101    0
125    1.15075    0
150    1.2005    0

Is it possible in code_aster?
Any help is highly appreciated.
Thanks


Attachments:
umatht_1.py, Size: 2.22 KiB, Downloads: 51

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#4 2019-11-21 15:22:06

Christophe Durand
Nuclear Fuel Division
From: EDF
Registered: 2007-11-22
Posts: 145
Website

Re: Thermal non line (Iso Mat) with material phase change ?

On my opinion, not feasable in the actual version of Code_Aster without a specific development. The state of the matter (powder or solid) should be a specific internal variable to be added.

Thank you for your feedback. If this development interests a motivated developer, this feature could integrate a future version.

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