LIGGGHTS® - User Forum

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

Hi everyone!!

I have a wall rotating and I need to track the position of one of the nodes in the mesh. I have been reading the LIGGGHTS manual and I haven't found anything that could help me. I also was reading topics on the forum but I haven't found anyone who faced this problem before.

I thought the lines below might do the job for me but it didn't work.

Hi everyone,

While installing the superquadric library through Makefile.mpi, I encountered the following error:

catastrophic error: cannot open source file "boost/math/special_functions/beta.hpp"
#include "boost/math/special_functions/beta.hpp"

What is your suggestion?

Thanks,
Sounik

Hi everyone,

I would like to know how LIGGGHTS calculates the contact area between Particle-WALL in a cohesive SJKR model. The given formula is:

A = Pi/4 * ((dist-Ri-Rj)*(dist+Ri-Rj)*(dist-Ri+Rj)*(dist+Ri+Rj) )/(dist*dist)

how are the values of 'dist' and radii evaluated for particle-wall interactions?

Thank you in advance for your kind reply,

John