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June 23, 2011, 09:24 |
simple 3D pipe flow diverges with icoFoam
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#1 |
New Member
Roland
Join Date: Jul 2010
Posts: 8
Rep Power: 15 |
Hello!
I am trying to get grips with OpenFoam. I set up a really EASY case. It is some kind of straight tube. The simulation should be easy, but after 6 iterations, icoFoam diverges. I use the solver settings from the elbow testcase. Possible problems i thought on: mesh: it is really fine, much too fine (just to be sure) time step: is also set really small (dx=2/40 m, U=1m/s -> dt=0.05 should be sufficient, i set it to 0.01) boundary conditions: inlet with Velocity set to 1 m/s; p at outlet set to 0 Pa. The rest is wall. I checked BC several times, and i find no mistake I include the test case. the case is ready to blockMesh and icoFoam you will see, it diverges after 6 time steps. any hint is really appreciated! Roland |
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