LIGGGHTS® - User Forum

Hello everyone
I am doing a simulation to check the bulk density of the particles, which is filled in a box. I want to know the bulk density or mass of the particles within the box.
How can I do this?

I have a complicated geometry and I want to count the particle through any cross-sections (which is basically a plane).

I was thinking to define a plane (for example the "region" command can define a "plane") and then use this massflow/mesh command. I thought it should be straightforward.

Dear All users,

I am wondering if the fix-deform and superquadric are compatible, especially for remapping the particles when the domain starts to inflate or shrink.

Kind regards,
Lumb

Hi Everyone,

It is possible for someone to let me know, the procedure to calculate coordination number (CN) for superquads?. Presently, I am using the compute for spherical particles, which is giving very high values (expected but unsure of the procedure) of CN.

As there are possibilities of face to face contacts in superquads as opposed to only point to point contact in spheres, I am wondering how it is being accounted for in the calculation.

Very much appreciated,
Sounik

I want to simulate a system of micro-sized particles via molecuar dynamic method. I have tried Lammpas and I know the Liggghts is more convenient for granular systems. I read topics in forums that have been reported problems in simulation of charged particles via Liggghts.
Finally, does Liggghts supports colloid packeage or no?
looking forward to get answers from developers.

Thanks

I have designed a box and trying to insert particles. But after computation, on viewing through PARAVIEW i cannot find the particles. I am new to LIGGGTS, any assistance at all appreciated. attaching herwith the code and files. the stl files are uploaded as pdf.

I run the cfdemCompCFDEMLIG, and a while later,
the following message showed up.
Does this mean I compiled liggghts sucessfully?

make[1]: Leaving directory '/home/ubantucl/LIGGGHTS/LIGGGHTS-PUBLIC/src/Obj_auto'

Hi, I am currently using a multisphere approach in a simulation with a washino/capillary/viscous model. I have inserted both an inertia tensor and mass as stated in the documentation however when I run the simulation the particles disappear after the insertion stage. I ran the script again without the inertia tensor and mass values allowing LIGGGHTS to calculate these through the Monte Carlo approach. The script ran fine and the particles are present, however the difference in mass, inertia tensor and n-sphere values for the approaches are very different.

Hi,

I used CMake to built an executable for Windows and it worked fine. I needed to do a few modifications to the source code.

1) I changed the fix_addforce.cpp file so that the radius of the particle and the fluid density were taken into account for the force with upward vertical direction. See line 259 and line 299 in the fix_addforce.cpp file attached.

2) I changed the fix_viscous.cpp to modify the drag force for a Bingham fluid. See line 71-84, line 107-110 and line 166-215 in the fix_viscous.cpp file attached.

Hi Everyone,

While installing through Makefile.mpi, my file path for including boost is not getting read/ignored.
EXTRA_INC += -IPath/to/your/Boost/include

This is probably due to the wrong placing of the command: I was placing the two lines right after LMP_INC

LMP_INC = -DLAMMPS_GZIP -DLAMMPS_VTK
LMP_INC += -DSUPERQUADRIC_ACTIVE_FLAG -DNONSPHERICAL_ACTIVE_FLAG
EXTRA_INC += -I$(TACC_BOOST_INC)

Can anyone help me regarding this.

Thanks,
Sounik