A rotary drum model

kunzhang's picture
Submitted by kunzhang on Sat, 09/29/2012 - 00:16

Hi All,

I want to learn how to set up the model of A rotary drum shown in the LIGGGHTS Feature, moving mesh. Is this model in the liggghts examples? or How can I find it?

Thanks,

Kun

richti83's picture

richti83 | Sun, 09/30/2012 - 15:41

you can adapt the movingmeshgran example from examples/LIGGGHTS/TutorialPublic/movingmeshgran/ simply change the stl to your drum and the move/mesh linear statement to rotate. read the manual about move/mesh !

I'm not an associate of DCS GmbH and not a core developer of LIGGGHTS®
but I have 7 years user experience using LIGGGHTS®, ParaView and LINUX

raguelmoon's picture

raguelmoon | Thu, 07/04/2013 - 23:28

Hi,
send me email I will send you an article OR download from my linkedin...
Cheers,
Ram

Ram

mpage | Wed, 03/06/2013 - 17:33

Like the previous poster I would like to experiment with a model such as that shown in the LIGGGHTS Features: rotary drum dryer example.

The model provided in the examples/LIGGGHTS/TutorialPublic/movingmeshgran/ in the distribution I recently installed is the moving bucket example (also from LIGGHTS Feature).

Some guidance on how to set up the rotary drum would be very helpful.

Thanks

kunzhang's picture

kunzhang | Fri, 03/15/2013 - 21:01

I use the gmsh to create the stl file for the dry drum. I think it is easy to learn and use for simple structure.

kunzhang

sivakumarcherlo | Wed, 07/31/2013 - 13:07

i am using liggghts for rotating drum. i am using 50000 particle of 1mm.
i am using a time step of 1e-06. If i do not use this time step, the simulations are diverging but using this time step is taking huge amount of time.
whether anybody suggest me how to increase the time step .may be 1e-05.

I am sure why this simple problem requires of time step 1e-06.

cstoltz | Wed, 07/31/2013 - 14:56

A stable timestep is largely determined by particle size, density, and modulus. You can often get away with lowering the modulus a bit (I prefer to use G >= 1e7 Pa) from reality with no significant impact on the simulation results, which may buy you some time depending on where you're currently at.

See fix_check/timestep/gran for details on determining stable timesteps. Shoot for dt ~ 20% of dt_r and you'll probably be fine.

Regards,
Chris