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-   -   Slip bc with compressibleInterFoam leads to velocity oscillation (http://www.cfd-online.com/Forums/openfoam-solving/57825-slip-bc-compressibleinterfoam-leads-velocity-oscillation.html)

florian_gruber March 10, 2009 09:24

Dear fellow Foam-Users, I'
 
Dear fellow Foam-Users,

I'm currently trying to run an injection mold simulation using a modified version of the compressibleInterFoam-solver, and keep running into stability problems.

The case setup is very basic: phase 1 enters a specified cavity geometry and displaces phase 2 (air), which leaves the domain on the other side via ambient boundaries. The walls of the cavity are set up as noSlip (fixedValue) and slip-bcs. It's only a testcase, so the mesh is purely hex and generally good.

After some time during the calculation, I experience strange velocity patterns normal to all slip boundary walls, which eventually blow up my solution. Does anyone else have similar problems using slip-bcs for a multiphase (vof) simulation?
Any hint or help would be greatly appreciated!

Best regards,
Florian


http://www.cfd-online.com/OpenFOAM_D...your_image.gif

florian_gruber March 10, 2009 09:48

Second try with the image, had
 
Second try with the image, had a connection timeout...

http://www.cfd-online.com/OpenFOAM_D...your_image.gif

florian_gruber March 10, 2009 10:11

Sorry for the triple post, see
 
Sorry for the triple post, seems to be a problem with the university gateway. The picture i wanted to show you can be found here:

http://img152.imageshack.us/img152/5688/oscillation.jpg

Best regards,
Florian

awacs October 18, 2009 22:58

Quote:

Originally Posted by florian_gruber (Post 179965)
Dear fellow Foam-Users,

I'm currently trying to run an injection mold simulation using a modified version of the compressibleInterFoam-solver, and keep running into stability problems.

The case setup is very basic: phase 1 enters a specified cavity geometry and displaces phase 2 (air), which leaves the domain on the other side via ambient boundaries. The walls of the cavity are set up as noSlip (fixedValue) and slip-bcs. It's only a testcase, so the mesh is purely hex and generally good.

After some time during the calculation, I experience strange velocity patterns normal to all slip boundary walls, which eventually blow up my solution. Does anyone else have similar problems using slip-bcs for a multiphase (vof) simulation?
Any hint or help would be greatly appreciated!

Best regards,
Florian


http://www.cfd-online.com/OpenFOAM_D...your_image.gif

Dear Florian,

I am interested in the injection molding simulation too. How is it going on? Hoping that we can help each other. :)

Best wishes,
Jitao


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