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January 14, 2006, 17:49 |
turbulent viscosity ratio for jet
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#1 |
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Hi everybody, I try to model an axisymmetric jet behind a turbofan exhaust. The problem is that with RANS the turbulent vicosity ratio is on the order of 10e4 which seems to be high physically. There exist two stream; one with Mach 0.4, and corresponding 10% turbulent intensity, and the other with mach 0.2 and 6%turbulence intensity. Is that much turbulent viscosity physical? If not, what can be the reason for that?
Thanking to everyone in advance for time and consideration. |
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January 17, 2006, 11:23 |
Re: turbulent viscosity ratio for jet
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#2 |
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You may have some answers through searching this website.
My suggestion is as follows: Test your problem by reducing the jet velocity (around 1/100 scale). If you still have the same problem, insert more meshes. or Remesh your domain. You may try the following schemes together; Lower relaxation factors, Use different initialization values, Start unsteady simulation at first. |
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January 17, 2006, 13:51 |
Re: turbulent viscosity ratio for jet
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#3 |
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Dear Kim, thanks a lot for your comments. I will consider your advice.
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September 19, 2014, 06:19 |
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#4 |
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Join Date: Nov 2011
Posts: 7
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Hi serpil..........i am doing simulations for normal shock at Mach = 2 at high altitudes. But i am not able to find what the value of turbulent viscosity ratio would be at such high altitudes and high reynolds number. Can u give some reference for find the value of turbulent viscosity ratio.
Also how u got this value " with RANS the turbulent vicosity ratio is on the order of 10e4". Thanks |
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