# Hydraulic diameter

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February 14, 2016, 15:55
Hydraulic diameter
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Jongmin Choi
Join Date: Jan 2016
Posts: 14
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Hi, I 'm doing ANSYS fluent tutorial

While I'm following 'chap. 7 using a non-conformal mesh,' I have been confused because of hydrulic diameter. It is little bit different from the knowledge that I 've learned from 'Fluid Mechanics' class in undergraduate, i.e.,

By using that equation, I could get a hydraulic diameter of 1.3 in but, the tutorial says that it should be 5 in.
I thought that the material that flows the main duct is air so I can use that equation.

I attach the captures of problem and tutorial.

Could you explain the reason why the hydraulic diameter of the tutorial is different from what I've calculated using the equation?
Attached Images
 Capture1.JPG (76.3 KB, 11 views) Capture2.JPG (61.8 KB, 5 views)

 February 14, 2016, 19:00 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,305 Rep Power: 22 The computational model makes use of symmetry and thus has additional boundaries. The height of the duct is still 5 inches which remains the characteristic length. The artificial symmetry boundary conditions that confine the computational domain do not change the flow at the domain inlet in the physical model. __________________ Please do not send me CFD-related questions via PM

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