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- - **RSM for 2D axisymmetric flows
**
(*https://www.cfd-online.com/Forums/fluent/39215-rsm-2d-axisymmetric-flows.html*)

RSM for 2D axisymmetric flows
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 |

Re: RSM for 2D axisymmetric flows
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. |

Re: RSM for 2D axisymmetric flows
Hi Kharicha,
Thanks for providing that insight. It really helps! -Murthy |

Re: RSM for 2D axisymmetric flows
Because turbulence is a 3d phenomen.
thomas |

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