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## #1 2016-08-30 13:30:41

jens
Member
Registered: 2016-07-19
Posts: 2

### nonlinear boundary conditions (flux(T,t))

Hello, is it possible to apply nonlinear boundary conditions as a function of temperature and time?

lambda(T) dT/dn = f (T, t)

In particular, I need the following boundary condition:

h (T) * (Text (t) -T)

with:
h(T):= heat transfer coefficient (temperature dependent)
Text(t):= external Temperature (time dependent)

Best wishes

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## #2 2016-09-01 13:43:45

stephaneberger
Member
From: Strasbourg (France)
Registered: 2012-10-15
Posts: 70

### Re: nonlinear boundary conditions (flux(T,t))

Hi,

Unfortunately, it's not possible to do what you want with code_aster.
What possible is :
- use h(t)x(T(t)-Tinf) where t is time and T is temperature.
- use non linear heat flow (FLUX_NL), where the flow F is function of Temperature and expressed in W/m² (depending of your unit system)

regards

Stephane

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