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Old   September 9, 2002, 07:56
Default Johnson-King Turbulence model
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Steve Allison
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I'm still hoping someone has an answer to my earlier question: can sigma(x) be less than unity, once the initial convergance criteria (with sigma=1) have been satisfied, or should sigma(x) always be greater than 1? The '87 Johnson paper is not terribly revealing. Is there only me using the JKM these days??

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Old   September 24, 2002, 03:31
Default Re: Johnson-King Turbulence model
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Sener Yilmaz
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Steve, Take a look at Johnson&King, AIAA J.vol 23 pp.1684-1692. sigma(s) is 1 in equilibrium condition. JK found this value as below as 0.6 and above 1.2 for supercritical airfoil calculations in one of their test cases. Also I found this value between 0.55-1.18 in ONERA M6 AoA=5.06 calculations. sigma(s) could be below or above this eq condition...

Hope this helps, Sener Yilmaz
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