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Old   April 27, 2007, 18:03
Default Need help in turbulence modeling
  #1
Andrew
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Hi,

I am trying to model a cooling ciruit in a rotating turbine blade. I started off with a circular channel for start, and was trying to examine the heat transfer characteristics with a stationary tubulent flow at first. I tried using the K-Epsilon model with wall function but i could not get a Yplus value above 30. So i tried to coarsen my grid and increase the reynolds number until i got it. However, i noticed a problem once i plot the velocity profile at different points along the channel, the velocity is not zero at the wall. I tried using the LES and the Sparlat Allmaras model and there is still a velocity value at the wall. I've exhausted myself trying to increase the pipe diameter, refine or coarsen the grid but there is no avail. Can anyone help me on this?
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Old   May 2, 2007, 10:04
Default Re: Need help in turbulence modeling
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Tim Foss
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I am trying to use the k-epsilon model in fluent and the convergence is almost right away after about 50 iterations. help please
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Old   May 2, 2007, 10:20
Default Re: Need help in turbulence modeling
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Phil
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what is the problem? if you don't have many cells then it could converge after 50 iterations. Are you using 2d? if so that sounds ok.

Andrew - sorry your question is too long, i fell asleep after the first 2 lines.
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Old   May 5, 2007, 19:39
Default Re: Need help in turbulence modeling
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Andrew
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Its alright, i got it to work already. Will try to better sumarise my question next time.

Thanks anyway.
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