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Interfoam unstable volumefraction/pressure

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Old   April 12, 2015, 09:23
Default Interfoam unstable volumefraction/pressure
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Dear all,

I am a new OpenFoam user, currently working in OF 2.3.0.
I am trying to simulate a moving cylinder in a two phase domain (like in a tow tank). The lower half of the cylinder moves through a mud layer, the upper half of the cylinder is just moving through the air. Both are modelled as Newtonian fluids. I attached a sketch of the problem.
The velocity of the cylinder is exponentially increasing from 0 to 0,1m/s.
When I run my simulation (setFields-interFoam) my results seem very unstable.
After about 6 seconds, the volumefraction alpha starts to behave strangly at the boundary of my cylinder (see attached picture).
Similar results can be found in the pressure field p_rgh.

I don't know how to upload a zip folder >78 kB, so I put my case files in a dropboxfolder, here you can find my boundary conditions, fvSchemes, fvSolutions,...

https://www.dropbox.com/sh/bx3xdqwyt...G0Vq2G8Aa?dl=0

Can anyone help me solve this behaviour or help me to get my simulation more stable?
You would really help me a lot!
Thanks in advance!
Attached Images
File Type: jpg alpha_7.4Sec.jpg (17.4 KB, 37 views)
File Type: jpg ProblemCFDForum.jpg (16.1 KB, 22 views)
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