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When to use Laminar or Turbulent formulation? |
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March 31, 2009, 11:58 |
When to use Laminar or Turbulent formulation?
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#1 |
New Member
The Spartan
Join Date: Mar 2009
Posts: 6
Rep Power: 17 |
Hello,
I want to model Fluid+Heat flow in the air gap between two concentric cylinders. The problem is steady state but I can change the speed of rotation of the inner cylinder. How do I select between Laminar or Turbulent flow? Do I have to calculate the Taylor or Reynolds Nu before Will the K-e model predict both Thanks! |
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March 31, 2009, 22:03 |
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#2 |
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Join Date: Mar 2009
Posts: 35
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You may try to see if your Renolds Number falls within the range that the laminar flow may be applicable.
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April 1, 2009, 09:50 |
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#3 |
New Member
The Spartan
Join Date: Mar 2009
Posts: 6
Rep Power: 17 |
Thanks,
I actually thought of that, but I am doing a parametric study. So for low rpm's I could use laminar and for higher turbulent. However, it doesn't seem right to compare the results from two different models. Any ideas? |
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April 1, 2009, 10:05 |
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#4 |
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Buddy
Join Date: Mar 2009
Location: P.R.C.
Posts: 30
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hi there
to get a situation of laminar current is pretty tough. theoretically the Re number below 50000 can be laminar current but as a matter of fact we can't get it until 2000. turbulence can be suitable under most of the circumstances unless you want to creat a laminar current situation on purpose. and the standard/RNG/Realizable k-e model is not suitable for the laminar current with a low velocity. regards |
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