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Meshing for rectangular duct

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View Poll Results: Which turbulence model is most frequently used?
k-epsilon stnd. 2 66.67%
k-epsilon RNG 1 33.33%
k-epsilon Real. 0 0%
k-omega stnd 0 0%
k-omega SST 1 33.33%
Multiple Choice Poll. Voters: 3. You may not vote on this poll

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Old   July 19, 2014, 08:11
Exclamation Meshing for rectangular duct
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Mehmet SENER
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Hello everyone,

I am a new user in FLUENT. I have been investigate turbulence flow in rectangular duct. I tried to use lots of mesh type on model but I didnt adapt to Dittus-Boelter correlation for Avaraged Nusselt Number.

My model is 80x80x200 mm rectangular duct, Re:10 000 so that dittus boelter appx. 32 . But I found between 55-87 at same Re value.

Turbulence model is k-epsilon, y+ is changing between 0,1-1,2(y+<5) . FL thickness is 0,0498 mm. I tried to select between 10-35 layers in Inflation but not achieved.

Can you explain me how to decrease A. Nusselt Number to dittus boelter value?

Thanks.
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Old   December 11, 2015, 08:41
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wangzhijun
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it is interesting...
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