cant pour required mass of grains

raguelmoon's picture
Submitted by raguelmoon on Wed, 08/10/2011 - 09:05

Hi,
We have performed experiments of silo containing glass beads of 2mm in diameter. We used 600gm of glass beads. Using LIGGGHTS, when we pour glass beads of same parameters used in experiment then it is impossible to pour even 200gm of beads in 4 times longer cylinder than used in experiment. Is there any solution for it? We want to use same size of cylinder and beads as we performed in experiment. Why liggghts uses more volume to occupy the same mass of beads?
Thanks
Ram

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ckloss_ | Wed, 08/10/2011 - 15:00

Hi Ram,

are you refering to a fix pour or fix insert command not able to provide a given mass flow or are you talking about hopper emptying massflow not matching experimental data?

Christoph

raguelmoon's picture

raguelmoon | Wed, 08/10/2011 - 15:15

Hi,
I want to fill the cylinder with pour command. The same size cylinder is filled with 600gm of beads but in LIGGGHTS it might need bigger cylinder to pour that amount of mass!!! Bigger than 10 times..!!!
Ram

Ram

ckloss_ | Wed, 08/10/2011 - 16:14

I don't get it...if the cylinder in the experiment is filled at a packing fraction of say 60%, you can do the same in LIGGGHTS. So I don't see where there could be a factor 10, or am I missing something? Anyway, we can discuss later at the workshop if u like, thats probably easier.

Best,
Christoph

raguelmoon's picture

raguelmoon | Wed, 08/10/2011 - 16:23

Hi,
Yes, in the experiment, the packing fraction is 60%; for example, I poured 600 gm of d=2mm particles in cylinder of height(h) 10cm and D=2cm. But when I poured the same amount of mass (600gm) of particles in 10cm(h) by 2cm(D), then LIGGGHTS can only fill 100gm of it with same packing fraction and same parameters of particles (density etc).
Thanks for replying...
Ram

Ram

raguelmoon's picture

raguelmoon | Thu, 08/11/2011 - 05:14

Hi,
I pour the particles from top of cylinder by pour/dev command and they settle down due to gravity.
Ram

Ram