LIGGGHTS® - User Forum

Hi
how can I fix the problem below?

ERROR: Fix wall/gran/hooke/history (id plate_wall): Fix wall/gran style and pair/gran style have to match, you have to define the wall after the pair style (fix_wall_gran.cpp:251)

thanks so much for your good commands.
Regards mozhgan

Hi
H worte a an example but when I run it this error has apeared

ERROR on proc 0: Cannot open dump file (dump.cpp:392)
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD
with errorcode 1.

Hi Chris,

as the command "region ID mest/tet xx.vtk ..." needs a volume legacy VTK file. What I am really confused is that, what is a real legacy vtk mesh that LIGGGHTS supports? And how to make/convert STL mesh to this type of mesh?

Importing STL file into paraview, and save as Legacy VTK, but it is

# vtk DataFile Version 3.0

and using gmsh -2 xxx.stl -o xxx.vtk, it's

hi
I run some of the examples of liggghts yesterday but today I can't run them and here is the command and the error .

saeed@ubuntu:~$ ~/Documents/LIGGGHTS-PUBLIC/src/lmp_openmpi < in.movingMeshGran
bash: in.movingMeshGran: No such file or directory

thanks so much

I am using LIGGGHTS but it uses only one processor for computing. I have installed LIGGGHTS by following http://cfdem.dcs-computing.com/?q=node/1789

None of the combination like processors 1 2 1 or processors 2 1 2 works...

Don't know whether LIGGGHTS is not multi-processor because no processor settings were made during compilation. Do I need to install LIGGGHTS with some added settings or feature can be added later.

Hello,

Hi all,

No doubt this is very simple, but I don't know Linux well enough to know what's going on.

I have gone through the :official" installation tutorial for Fedora on this website, everything seemingly went smoothly until the last step:

+ Set a following symbolic link for LIGGGHTS (use lmp_fedora if you use the fedora makefile):
+ Type "sudo ln -s /path1/src/lmp_fedora /usr/bin/liggghts"

I ran this command from the home directory with path1 replaced with LIGGGHTS-PUBLIC, which gives an error 'symbolic link already exists'.

pair/gran/hooke and wall/gran/hooke does not work correctly. For example, the source "pair_gran_hooke.cpp" contains lines number 197-206 with the code:

// force normalization

fn = xmu * fabs(ccel*r);
fs = gammat*vrel;
if (vrel != 0.0) ft = MIN(fn,fs) / vrel; ======== ??? ========
else ft = 0.0;

// tangential force due to tangential velocity damping

fs1 = -ft*vtr1;
fs2 = -ft*vtr2;
fs3 = -ft*vtr3;

Hi everyone,
I have tried to calculate the velocity of particles based on their position, but the results show that the velocities which I calculated are exactly twice the dumped velocity. I have checked the time interval, I used the real time as follows:
"real time=timestep*No. of steps"
I was wondering if anyone has any idea why this happens?or what am I doing wrong?

Cheers,
Mahsa

I am performing a long-running simulation in LIGGGHTS. It has approx 10,00,00,000 steps and dump files are written per 1000 time-steps. Working with such huge number of files, it becomes really difficult to perform lpp processing of all at a time. If I need to check the progress while the simulation is on the go everytime above command starts from beginning which is clearly a waste of time. Also, if any interruption happens or error comes then I have to perform lpp from beginning with the command lpp dump*.mixer.