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How to set this boundary

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Old   March 13, 2013, 04:41
Default How to set this boundary
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Hi I want to set this boundary to the lower wall of my geometry how i can add it?

(dT/dy)=k(dT/dy)

where
dT/dy is the temperature gradient along the y-direction
k is the thermal conductivity
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Old   March 13, 2013, 17:48
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temperature gradient is varying along y axis, its simple in thermal distribution define k for y axis and leave it blank for others
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Old   March 21, 2013, 06:55
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Your answer is not clear i want to write udf for the temperature gradient?
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