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#1 |
New Member
Sharat Chandrasekhar
Join Date: Jan 2020
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Is it possible to obtain meaningful velocity profiles for fully developed pipe flow with one-dimensional (radial coordinate only) finite difference simulations using the k-epsilon class of turbulence models ?
I know that this can and has been done using mixing length models, but wanted to check with the experts on this forum before embarking on a fool's errand. Thanks |
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#2 | |
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Filippo Maria Denaro
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#3 |
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andy
Join Date: May 2009
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Yes. It may not be particularly informative with respect to the velocity profile though because it will simply follow from a linear shear stress. If you know the wall stress from your boundary conditions then the details of the turbulence model becomes irrelevant to the velocity profile.
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#4 |
Senior Member
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It can be done, and I actually suggest it as a useful toy model to learn dealing with turbulence models and/or wall functions.
The same holds, obviously, for other simple settings, like the simpler channel or the boundary layer. The latter however is more interesting because it is the basis for some wall function approaches. However, it depends from what you want to do. Along the same lines, if you extend the approach to the 2D section you can use it as inflow generator (but to be useful you would need it for unstructured 2D grids) |
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#5 |
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Sharat Chandrasekhar
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Hello, I'm trying to solve for the complete velocity profile, not just the near wall region, in a concentric annulus.
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#6 | |
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Sharat Chandrasekhar
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#7 | |
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Sharat Chandrasekhar
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#8 |
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Consider that for the k-epsilon family of models you are going to need a wall function, even if in 1D. So, what you will see is how this performs more than how the k-epsilon performs. As a matter of fact, most wf models actually mimic the mixing length model, so you might not see any specific difference.
Maybe try the k-omega family or the Spalart-Allmaras. |
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Tags |
fully developed flow, k-epsilon turbulence |
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