The concept of Hydraulic Diameter in Turbulent Boundary Conditions

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Mudassar Hussain

Please see the link below for using flow boundary conditions in Fluent.

http://www.arc.vt.edu/ansys_help/flu_ug/x1-4300008.63.2.html

Tirtha Banerjee

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.96.044502

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.88.014501

These two papers could be of help. They connect the concept of hydraulic radius/diameter to the fundamental quantities based on a mechanistic argument.