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Old   November 29, 2010, 19:46
Default Hydraulic Diameter
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I'm trying to solve a sudden expansion mesh in FLUENT using K-e model. I'm using turbulent intensity and hydraulic diameter for giving turbulence BC. I want to what should be the hydraulic diameter for a axisymmetric sudden expansion and also how do I guess the value of turbulence intensity?
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Old   November 30, 2010, 04:10
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CFD-Wiki contains an estimation of the turbulence intensity in a fully developed pipe flow. see http://www.cfd-online.com/Wiki/Turbulence_intensity. That page also links to the definition of the hydraulic diameter.
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Old   November 30, 2010, 07:49
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For a sudden expansion there are two diameters. which one should be taken into account when I'm interested only the flow behaviour at the downstream of the expansion.

can you please help me setting the BC for a sudden expansion?? I really need some help here.
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Old   November 30, 2010, 07:53
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What you want to compute are boundary conditions at the inlet, right? Then it is the inlet dimensions that you should use.
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Old   November 30, 2010, 08:13
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yes. BC at inlet.
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Old   November 30, 2010, 08:15
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so simple!

n eureka ! i just discovered that .. any response < 10 characters won't get submitted to the forum.

P.S: was it to stop spam ?
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Old   November 30, 2010, 08:46
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I'm posting the pics of sudden expansion. The inlet dimensions were variable in the actual experiment but How do I do that in the given mesh? I have to compare the results with the experimental data.
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File Type: jpg untitled.JPG (10.3 KB, 9 views)
File Type: jpg Expansion.jpg (50.3 KB, 10 views)
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