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Temperature below 0K

Posted Jun 22, 2010, 4:04 a.m. EDT 0 Replies

Kai Schmitt
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Hi,

I have a (imho) simple problem:

3D instationary heat flux

rectangular solid (1x1x10)

subdomain condition: given Initial temperature T(x,t=0)=T0=0K

boundary conditions: no heat flux on 5 surfaces
given constant temperature on 1 surface (1x1): T(x=0,t)=100K

this problem can be solved analytically (as a 1D problem), but if I do this with comsol, I get an temperature profile, where in the temperature is sometimes below 0K! How can I treat this problem correctly with COMSOL? I think, the problem is the following:

T(x,t=0)<>T(x=0,t) on the surface, where the temperatur is 100K (incompatible inital and boundary conditions)

Should I attache the file?

I'm using version 3.5a

Thanks!

0 Replies Last Post Jun 22, 2010, 4:04 a.m. EDT
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Hello Kai Schmitt

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