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Periodic Fully Developed Pipe Flow - Results dont make sense

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Old   March 4, 2015, 15:43
Default Periodic Fully Developed Pipe Flow - Results dont make sense
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daniel
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Hi all,

Ive modeled half of a pipe utilizing a symmetry plane, two periodic bcs, and a wall.
I specify the mass flow rate at one end and let the solution run until convergence (residuals <e-8).
This model utilizes the Low-Re turbulence model, simplec for v-p coupling, and second order methods for the fluxes.
My issue is that the results are nonsensical. Looking at the friction coefficient contours on the wall they are not uniform. The static pressure throughout the pipe is not uniform.
I believe my mesh has identical inlet/outlet interfaces.

Can someone please give me some troubleshooting tips?

PS The purpose of this model will be to extract he fully developed velocity profile and utilize it to initialize another simulation which posses more complex geometry
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Old   March 5, 2015, 23:54
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Lucky
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just to make sure, this is a constant property simulation correct?

I've done these types of simulations hundreds of times and gotten great results. I'm not sure why it isn't working for you. Only thing new is that I've never tried it with a low-Re model (but I have done rke, kwsst, v2f, linear RSM & quadratic RSM). I've also done simple, piso, and the coupled solver. Have you already tried reducing the under-relaxation factors?
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fully developed, periodic bc, pipe, turbulent

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