Hi all,
Does any know why my particles are floating after inserting? I would like my particles to sink/settle to the bottom without floating. I have attached with my script. Thanks in advance.
| Attachment | Size |
|---|---|
 cubic.odt | 16.08 KB |
 21222465_10155657216199727_1285827916_o.jpg | 282.2 KB |
| 21222804_10155657216209727_749659182_o.jpg | 455.58 KB |
mschramm | Thu, 08/31/2017 - 19:57
What do you mean
What do you mean by floating? I looked at the script and you are not adding a buoyancy force???
How are you viewing your results? Are you using the sphere glyph in paraview where the particles are scaled by their radii?
z3490628 | Fri, 09/01/2017 - 14:52
Hi mschramm,
Hi mschramm,
I have actually recreated the same forum topic and I have seen your reply on my previous topic. I am addressing the same problem in both topic.
What do you mean by buoyancy force?
I am using paraview to view my result and I have adjusted the particles to Gaussian Point with certain radius.
mschramm | Mon, 09/11/2017 - 17:00
Some more questions
What is the end goal? Do you want a pure cubic structure that forms a lattice?
What do you mean by "floating"? Is this in relationship to the particles not settle under gravity?
Your time step is 1e-8 and running the simulation for 65000 steps which will allow the particles to move a maximum of 2.07e-6 meters
Change
fix ins all insert/pack seed 32452843 distributiontemplate pdd1 vel constant 0. 0. 0. &
insert_every 2000 overlapcheck yes all_in yes particles_in_region 8000 region reg
to
fix ins all insert/pack seed 32452843 distributiontemplate pdd1 vel constant 0. 0. 0. &
insert_every 2000 maxattempt 500 overlapcheck yes all_in yes particles_in_region 8000 region reg
this will try to insert a particle 500 times whereas the default value is 50.
LIGGGHTS has a buoyancy force for certain simulations. I do not believe you actually want that. I was just confused by your wording.
z3490628 | Tue, 09/12/2017 - 06:57
Hi mschramm,
Hi mschramm,
Sorry for the confusing wordings. I would like to apply confining pressure to all the sides by using meshes and the command 'fix mesh/surface/stress/servo/' afterwards to compact the particles. I think I have used the wrong properties in Paraview when viewing the result. So, it is no longer floating now.
So the script I have provided currently is just the initial set up for me before applying confining pressure.
Thanks for your help.