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capturing small rise in temperature

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Hi,

I have a rectangular block where I have assigned a heat source (W/cm^3). My ambient temperature is 25 deg. First I assigned a high thermal load and recorded the peak temperature. Then I reduced it by factor of 10 and recorded the temperature again. After reducing it few times, I plotted the peak temperature. Initially, the temperature came down linearly then after a threshold , the peak temperature remained stuck at 25.1 deg.

This does not make scene. Is there a way I can increase the model sensitivity at extremely low thermal load.

Regards,
Susant

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