|February 8, 2011, 07:37||
Help with pimpleFoam
Join Date: Sep 2010
Location: Santiago, Chile
Posts: 7Rep Power: 7
Iím using pimpleFoam to simulate a 3D flow on a very small irregular tube (total volume around 2e-7; 150000 elements (tetrahedral)). Iíve used the files of T-junction tutorial as a base. Iím also using GroovyBC to make the pulsatile velocity with a parabolic profile at the inlet and the pressure at the outlet. Turbulence model is a RAS kOmega and the fluid is Newtonian.
Iíve achieved convergence with pulses with top inlet velocity around 0.6 (Re=450). The minimum time step then was 1.8e-5. The problem is that I canít achieve convergence with higher inlet velocities (Re=650 to 800). Iíve tried a lot of combinations of correctors (1 to 4), nonOrthogonalCorrectors (1 to 4), outerCorrectos (1 to 4), maxCo (1 to 0.5) and relaxation factors (1 to 0.05). I always get a blowout close to the top velocity but sometimes at a velocity lower than the top velocity of the case that worked, which to me is very weird.
If someone knows what I can do to solve this (or needs more info to do so) please let me know.
Thanks in advance!
|groovybc, pimplefoam, pulsatile|
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