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Thermal Wall functions

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Can somebody elaborate on this from the reference manual pg (794) :

"Wall boundary conditions for turbulent fluid flow. For the k-ε turbulence model, this condition is of the type k − r( ε ), −n · ∇ε, where r is a given function. Bidirectional constraints for the first relation imply that the second relation cannot hold."

It appears in the section of symmetric and non-symmetric constraints.

Further i have the following message printed on my log screen :

“Inconsistent point-wise unidirectional constraints found.
78 constraints are merged/removed.
More inconsistent point-wise unidirectional constraints found...”

I think, since I'm solving heat transfer with turbulent flow, the constraint by nature bidirectional.



0 Replies Last Post Jul 15, 2016, 8:04 a.m. EDT
COMSOL Moderator

Hello Parth Swaroop

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