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RSM for 2D axisymmetric flows

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Old   January 12, 2006, 09:02
Default RSM for 2D axisymmetric flows
  #1
Murthy Ravikanti
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Hi,

I am implementing Reynolds Stress model for 2D axi-symmetric flows without swirl. Hence I am solving only for UU,VV and UV stresses.

I am facing difficulties in getting a physically realistic solution. When I refer to FLUENT's way of solving 2D axisymmetric flows without swirl, I find that it solves WW stress as well!!! ..How is it possible to have finite WW stress when there is no W velocity component in the first place? Thanks, -Murthy
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Old   January 18, 2006, 06:12
Default Re: RSM for 2D axisymmetric flows
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kharicha
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You forget an important idea: Turbulence is a 3D phenomena.

RSM is a RANS model, which divides the flow into mean flow (U, V, W) and turbulent fluctuations (U*, V*, W*).

You can simulate a 2D axi-symmetric flow with U, V and a mean W equal to 0. BUT THIS DOESN'T MEAN THAT THERE ARE NO FLUCTUATIONS IN THE THETA DIRECTION (WW stress).

SO what you got is realistic.

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Old   January 18, 2006, 07:32
Default Re: RSM for 2D axisymmetric flows
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Murthy Ravikanti
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Hi Kharicha,

Thanks for providing that insight. It really helps!

-Murthy
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Old   January 25, 2006, 12:45
Default Re: RSM for 2D axisymmetric flows
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Thomas
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Because turbulence is a 3d phenomen.

thomas
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