ESyS-Particle

Single particle along a mesh and bounces off as it hits the floor

Asked by Toketo

Hello ESyS-Particle mates!

So I have done a simulation with a box of particles next to an inclined plane (made out of mesh) and it worked fine and it flowed just as expected until it reached the floor (made from ESyS-Particle). Now I tried to simulate the same situation but only with one particle. What happened is that as the single particle reaches the floor (made out from ESyS-Particle), the particle bounces off so high! Same parameters were used. Could it be the problem with the elastic contact modulus? In both simulation, 1.0e-06 was used (this was because I had all my parameters in terms of mm).

Also, when I checked the fieldsavers for velocity and its absolute velocity for a single particle, all it contained were bunch of zeros.

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Dion Weatherley
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Dion Weatherley (d-weatherley) said : 		#1

Hi Toketo,

That sounds like an interesting problem. Could you please email me your scripts and mesh file for the single particle test case? I suggest you email me directly: <email address hidden>

Cheers,

Dion

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Toketo (tomcarlosimborio) said : 		#2

I sent it to you already Sir Dion. Thanks!

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Launchpad Janitor (janitor) said : 		#3

This question was expired because it remained in the 'Needs information' state without activity for the last 15 days.

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Dion Weatherley (d-weatherley) said : 		#4

This question needs resolution

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Best Dion Weatherley (d-weatherley) said : 		#5

Hi Toketo and other ESyS-P users,

I've had a look through the scripts you sent and replied via private email. For the benefit of other users of triangle mesh walls in ESyS-Particle, here are two general tips:

1) Ideally the mesh should be relatively low resolution. In other words, the size of the smallest triangle should be larger than the diameter of the largest particle in the model. This is not a critical constraint but ultra-fine meshes may result in very large computation time.

2) Triangle mesh walls are one-sided. It is important to ensure that the ordering of triangle nodes in the mesh file is carefully chosen to ensure the normal vector of the triangle points towards the region containing particles. The ESyS-Particle Tutorial contains instructions on ordering of nodes in mesh files.

Cheers,

Dion

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Toketo (tomcarlosimborio) said : 		#6

Thanks Dion Weatherley, that solved my question.