LIGGGHTS® - User Forum

Hi all,

I am wondering, if I could move a mesh along a curve like "8" with the command "fix move/mesh"? It is hard to achieve it with a combination of linear, wiggle and rotate. I have the values of x and y on the curve. But I don't know how to simulate the motion in Liggghts.

Thanks.

Best regards.
Alvin

Dear developers and users,

I'm failing to install correctly LIGGGHTS, here's the problem i met

em328@em328-VirtualBox:~/LIGGGHTS-PUBLIC/python$ python install.py ~/.local/lib ~/.local/lib/python2.7/site-packages/
WARNING: LD_LIBRARY_PATH undefined, cannot check libdir /home/em328/.local/lib
cp ../src/libliggghts.so /home/em328/.local/lib
cp ../python/liggghts.py /home/em328/.local/lib/python2.7/site-packages/

I installed both LIGGGHTS-WITH-BONDS and LIGGGHTS_Flexible_Fibers-master on my computer and I performed uniaxial compression test using both version respectively. I have a problem for both version and I am wondering if I wrote something wrong.

Hello Members,

Installation of LIGGGHTS inside a cluster with intel mpi resulted in the following error on the execution of "make auto":

Warning: MPICXX compiler is icpc but g++. Thus, setting the MPICH cxx compiler to g++.
make[1]: Entering directory `/work/06321/runa1234/stampede2/LIGGGHTS-PUBLIC/src/Obj_auto'
Makefile:499: *** 'Could not compile and link a simple MPI example. Test was done with MPI_LIB='. Stop.
make[1]: Leaving directory `/work/06321/runa1234/stampede2/LIGGGHTS-PUBLIC/src/Obj_auto'
make: *** [auto] Error 2

Sorry to repeat post, however after considerable time I've been unable to find any reason why this should be happening, and am curious if anyone else who uses LIGGGHTS with Bonds has been able to reproduce the problem.

Hi everyone
I am doing a silo simulation. I want to unfix insertion of particle after certain timestep. I have written the following code but it is showing some error
#--------------------code---------------------------
#insert the first particles so that dump is not empty
run 1
dump dmp all custom/vtk 200 post/bulk_*.vtk id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius
dump dumpstress all mesh/gran/VTK 200 post/mesh_*.vtk stress wear cad1 cad3

#insert particles
run 10000 upto

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,

I am currently attempting to model multisphere particles falling onto a bed and a spreader being used to run over the particles. I am having an issue that the particles seem to disappear as they are about to fall onto the bed. I have reduced my timestep and altered the youngs modulus incase it is a force issue between the particles. I do not seem to receive any errors and I was wondering if anyone had any ideas. Thanks, the script is as follows:

log log-000.txt

As mentioned in LIGGGHTS version history, we can use mesh/vtk to dump mesh temperature. I can not find any option in mesh/vtk to do this.
Please, help me.

Hello LIGGGHTERS,

Recently, I tried to simulate bin flow tutorial existing in the forum. By examination of the results, I noticed that the my output might not be coherent with real physic of the system. I have attached two images to this post which shows there are regular spaces between certain value of particles while they fall through the bin. The images correspond to 1st time step and 2nd time step.

I suspicious about the input script. Do you think this problem can be related to insert_every value?