Particles in the wrong position

Submitted by fabregas04 on Tue, 05/15/2018 - 09:22

Hi,

Now I'm suffering from particles being in wrong position.

I created the mesh as the container and then pour the particles in the container.

After that I push the particles with the other mesh.

But the problem here is some of the particles are getting out of the container and fall continuously.

The thing is that particles should not fall from the container as expected.

Can anyone guess what is the problem?

By the way, I'm using the m m m boundary.

richti83's picture

richti83 | Wed, 05/16/2018 - 13:54

Hard to say without your case setup. Maybe your timestep is to big and particles penetrate out of the wall.
What Particle Diameter, Young Modulus, Coefficient of Restitution and Timestep are we talking about ?
Can you append your script to your initial post (use edit function).

I'm not an associate of DCS GmbH and not a core developer of LIGGGHTS®
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fabregas04 | Wed, 05/16/2018 - 14:07

fix m1 all property/global youngsModulus peratomtype 3.4e7 3.4e7
fix m2 all property/global poissonsRatio peratomtype 0.35 0.35
fix m3 all property/global coefficientRestitution peratomtypepair 2 0.5 0.5 0.5 0.5
fix m4 all property/global coefficientFriction peratomtypepair 2 0.5 0.175 0.175 0.2

fix pts1 all particletemplate/sphere 49979687 atom_type 1 density constant 7350 radius constant 0.00025

timestep 0.00001

This is the parameters I used in my simulation. And I push the particles which were poured in container with the cylinder at 0.05 mm/s.

Would the time step be the problem?

fabregas04 | Wed, 05/16/2018 - 14:22

Which one is the critical part between Rayleigh time and Hertz time?
I don't quite understand about these time..