Simulating a partial ring of particles using periodic boundary conditions

From: Phil Sutton <>
Date: Mon, 28 Jan 2013 10:49:52 +0000

Hi all,

I am currently and have been modelling a complete ring of particles using vacuum boundary conditions with very good success. However I would like to investigate some long term structures and features within the ring and would therefore like to reduce the overall calculations down by reducing particle numbers. For example only model ¼ of the ring and concentrate on certain features. I have not used periodic boundary conditions before but I can’t see how place a box round the particles would work in my situation. Ideally I would have liked a box that co rotated with the particles, and I assume that GADGET2 uses a stationary box? Is it possible to use GADGET2 to simulate only a small section of a rotating ring? Would particles leaving the box on one side have the correct direction and position on the other side again? Also if particles did leave the box on one side and started again of the other side what would happen to a moon that was orbiting with the ring. For example ring particles are ok to start again on the other side, but a moon should not come around again until its faster or slower orbit allowed to meet back up again with the same part of the ring. So therefore would you need to treat particles differently when reintroducing them back in again?


Received on 2013-01-28 11:49:54

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