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January 5, 2015, 12:05 |
strange boundary layer with dbnsTurbFoam
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#1 |
New Member
Jens
Join Date: Apr 2014
Posts: 28
Rep Power: 12 |
Hi foamers,
I wish you a happy new year! Here is my first problem for 2015 : i created a test case for a channel flow where the upper and lower boundaries are no slip walls, back and front are inlet and outlet and the side patches are symmetry planes. I want to use dbnsTurbFoam (with local time stepping) and RS turbulence modelling with wall functions. I use first order discretization for turbulence and roe/venkatakrishnan for rho, rhoU and rhoE (second order). The attached image shows the case with very strange near wall results. What i tried: - no turbulence modelling (works fine) - using k-epsilon model (even worse, see picture) - first order discretization (no improvement, very strange right?) - different limiter (no improvement) - global time stepping (- " -) In the simulation i'm actually trying to perform the boundary layer is not as bad as in the test case. But still oscillations in wall normal directions. I think this is due to the fact that the walls end in the domain and not at the outlet (worst results in test case). I would really appreciate your advises. Jens |
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