unit for the dem and cfd

Submitted by dan_nott on Fri, 05/11/2018 - 14:09

Hi,

Can I use the unit cgs for cfd but micron for dem in the simulation?

Dan

Ermek Asylbekov | Mon, 05/14/2018 - 11:09

Hi Dan,

The problem is the time unit which is microseconds for micro unit system. Since the CFD part uses seconds the coupling will be all messed up (yet?). It might be fixed in future versions (I hope). If you are more into C++ development you might implement it in CFDEM-coupling. The "only" thing there is to do is to translate the units and correct the coupling interval. But there's some work to do.

What are you trying to simulate?
Regards,
Ermek

dan_nott | Mon, 05/14/2018 - 13:45

Hi Ermek,

Thanks for your reply. I will simulate the nano-size particles. when I am trying to setup the case, It was suggested to change the volume_limit. i am not sure if this will reduce the accuracy of the simulation. May I ask, volume_limit or unit change, which is the bettert way to modify?

Best regards,
Dan