LIGGGHTS® - User Forum

Sorry for the trivial question, but I am new and I am not able to install LIGGGHTS on my Windows laptop. I tried to follow the instructions written here: https://www.cfdem.com/media/DEM/docu/Section_start.html but I they are not very clear to me. Can anybody help me? Any advice will be useful, thanks.

Dear all,

Dear all,
I am a new user of LIGGGHTS and still learning it. Meanwhile, I saw an image of icing on a substrate simulated using LIGGGHTS code and posted as an application example on the CFDEM website. Currently, I am working on a student project related to freezing of supercooled water droplets.

I would like to ask you whether there is any documentation or tutorial of these icing example. I would really appreciate if anyone could help me on this aspect. Definitely, I would cite the code properly when I would write the student project report.

Hello Every one,

I am having a problem understanding how to define "vec_side" with "count multiple" in fix massflow/mesh command.

I tried every thing I could think about to determine the vector components defining the “outside” of the mesh but I keep getting the error:

ERROR: Fix massflow/mesh (id massflows): requires a planar face mass flow measurement or using 'point_at_outlet' (../fix_massflow_mesh.cpp:344)

I am trying to simulate such a dynamic process: two particle impact and bond together, and a new particle comes and hits these two to break the bond or to bond with one of them to form a cluster. The free-to-go particle can again impact with other particles and form a bond (or bounce off).

Work Location: Idaho Falls, Idaho, United States.

Duration: about three months (with financial support for roundtrip and temporary living in Idaho Falls); starting from May 2018.

Idaho National Laboratory (INL) is seeking graduate student internship applicants for DEM simulations for engineering-type applications & research.

Preferred Qualifications:

* Familiarity with LIGGGHTS as a user is a significant plus.

* Research experience in the discrete element method (DEM).

Hi,
In the new version of LIGGGHTS 3.8 there seems to be an issue with writing files with .gz extension, which was working fine in previous versions. Taking the periodicChannel tutorial in CFDEM as example, in the file DEM/in.liggghts_init, adding gz to dump file name:
post/dump.liggghts_init.gz

and running parDEMrun.sh gives the following error:
ERROR on proc 0: Cannot open gzipped file (../dump.cpp:460)

If I run the same case in previous (LIGGGHTS 3.6) it works fine. Would you please let me know where the error is stemming from.
Thanks

Has anyone else had issues where dump image blows up using the bonds package?

Hello,

I am trying to simulate the angle of repose test. On every case, particles roll over the lower surface : no cone is forming.
I use this parameter to modify my results without success :
- Coefficient of restitution particle–particle
- Static friction coefficient particle–particle
- Rolling friction coefficient particle–particle
- Coefficient of restitution particle–wall
-Static friction coefficient particle–wall
- Rolling friction coefficient particle–wall

Do I have to use cohesionEnergyDensity ?
Any help?

Is Liggghts allow the Brownian motion of particles?. I want to use this in my attractive particle. Please let me know about this, any alternative idea would be appreciated. Thanks