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## Maximum range of T in heat transfer module

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Dear all,
I am solving a transient heat transfer model to describe laser ablation of metals.
I got the message 'inf or NAN found in residual", I encounter this error whenever the temperature in the field goes higher than 5000 K,
Is there any limitation in the range of temperatures which the comsol code can handle? If yes, how can I raise the maximum temperature limit?
I would be grateful if someone could help.
Thanks in advance.

2 Replies Last Post Mar 3, 2010, 12:22 a.m. EST

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Posted: 1 decade ago
How are the material properties entered for you model ?

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Posted: 1 decade ago
Dear Freels,
The material properties are as follows:

sph=((284.65-4.387e-3*T-2.01e6/(T^2)+2.26e-5*T^2)*flc2hs(2750-T,1)+443.18*flc2hs(T-2750,1)) specific heat

tcond=((49+0.015*T)*flc2hs(1067-T,1)+65*flc2hs(T-1067,1)) thermal conductivity

ref= ((0.75-6.12e-5*(Ts-300))*flc2hs(2750-Ts,1)+(0.6-8e-4*(Ts-2750))*flc2hs(3000-Ts,1)*flc2hs(Ts-2750,1)+(0.4-5.7142e-5*(Ts-300))*flc2hs(6500-Ts,1)*flc2hs(Ts-3000,1)+0.2*flc2hs(Ts-6500,1)) reflection coeficient

ro= 8570[kg/m^3]

these properties are according to the table 1 of the article ref25.pdf for Niobium. I'm going to construct the same model explianed in the article for another material, but first I should validate my model by comparing my result to that of them.

many thanks for your help.

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