section of a cylinder

Submitted by Hobbygeneral on Sun, 06/15/2014 - 21:57

Hey everyone there,

I am doing a simulation of a cylindrical shear cell which needs 68000 particles to operate. Unfortunately i can't handle this amount with my hardware so the idea was to cut out the half or a quarter of the cell.

The problem is, that i found no way to define periodic boundary conditions for this special case. Is there a workaround? Can anybody tell me if it is possible to do a simulation of a part of a cylinder?

Thanks in advance
Stephan

Forums:

msandli | Mon, 06/16/2014 - 19:04

If I understand your question correctly, you are wondering if it is possible to have two non-parallel faces in a cylindrical region as periodic. I believe the answer is no - see http://www.cfdem.com/forums/periodic-boundary-conditions-cylindrical-coo...

Depending on your simulation, you might be able to get away with importing a half or quarter cylinder geometry into a cubic region, and then treating the "open" faces of the cylinder as having zero friction and a COR of 1 - effectively making them symmetric. If the open faces of your cell are small compared to the overall simulation volume, the difference in symmetric vs. periodic boundary conditions might be negligible. I'm not familiar enough with the operation of shear cells to know if that will work.

hope that helps

Hobbygeneral | Mon, 06/16/2014 - 20:12

You understood my question correctly. I have seen the link before and wondered, if something changed in the meantime.

Thanks for your suggestion. In my case the focus is on the motion of the particles so maybe your assumption will work if i only consider the particles, which are far away from the open faces.
I will give it a try.