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Convection coef below zero

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Old   April 5, 2019, 03:01
Default Convection coef below zero
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crinoid
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Hi
I am modeling the heat transfer through a fin and onto the air. I have the solid and the fluid domains.
In the tip of the fin, the heat transfer coef has the expected value, but it is below zero. Its temperature is, noneless, greater than the air temp around it and greater than the reference temp.
I don't know where's the problem
Thanks in advance!
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