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d2T/dx2 = 0 instead of dT/dx = 0 (outflow)

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Old   February 24, 2012, 12:05
Default d2T/dx2 = 0 instead of dT/dx = 0 (outflow)
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Hi everybody,

I have a big problem with boundary conditions of Fluent. I want to impose in the outlet of my conduct d2T/dx2 = 0 and there is no boudary condition doing that. For big Reynolds Number, I can put "outflow" (so dT/dx = 0) as a condition in outlet 'cause it has no big influence. But my problem deals with very small Reynolds numbers and so, outflow causes big trouble in my work and solution is false.

Can anybody help me?

Ps: I have a fluid in my duct so don't confuse with UDF that are reserved to walls or solids in general.
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dt/dx, heat flux, outflow, udf, uds

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