LIGGGHTS® - User Forum

hi all,

I want to study the particles segregation in blender for which I need the initial state of particles to be completely mixed/random.
Does the fix style "particledistribution/discrete" create completely mixed state of particles or is there any other command?
Please let me know your suggestions.

Thanks,
Shiva.

Hi Everyone,

I have been trying to figure out this problem for a while now and I have not been able to find the solution.

What I have:
Particles impacting on a wall.

What I need:
The average forces acting at the nodes of the mesh for a certain number of timesteps.
Alternatively the stress acting on the elements of the mesh for those timesteps.

What I have achieved:
To print the stresses for the full mesh in a txt file.

Hi,

I want to control the force model, It is now working as elastic after reaching the threshold it is plastic. If I stop the force my particle is going to initial position but I want to it's remains the same distance covered, again if I apply force it should be elastic again. For your better understanding please see the attachment pictures.

I am new to liggghts and voro. I was trying to compile voro++ in LIGGGHTS, the last step which is

make g++

shows errors as:

Makefile:106: recipe for target 'g++' failed
make : *** [g++] Error 1

I don't know why. Then I used

make mpi

which was working fine. I think I compiled voro successfully. However, when I tried to use compute voronoi/atom command and ran, it shows errors:

Invalid compute style

Can anyone help with this issues? It will be really appreciated.

Hi Everyone,

I have been trying to figure out a way to pack particles with superquadrics and use that as a template for a multisphere superquadric. Does LIGGGHTS-PUBLIC currently support this kind of setup? Is saving a pack state and loading it even possible in general?

Kind Regards,
Matt

Hello ,
I have a problem with the LIGGGHTS post processing process
I wanted to make a test with chute_wear but when I make : lpp dump*.chute , I have an error occuring : command lpp not found

Also when I run Paraview I have lots of error lines :
Xlib: extension "GLX" missing on display ":10.0".

May I have any suggest to fix these errors ?
Thank you !

HI,

This is the consecutive question of "FORCE ON MESH NOT CONSISTENT", https://www.cfdem.com/forums/force-mesh-not-consistent

It was told that the force on mesh should be averaged at least for 1000 time-steps.

What is the justification of the value of 1000 time-steps?

If I make the average with the different number of data, the statistics of the forces change a lot.

Would you give a hint for me to get the appropriate statistics of the forces on mesh?

Thanks,
Hakun

Please help!
I have run install.py with no problem. But when i try to test liggghts from python. It has two error:OSError:/usr/lib/libmpi_cxx.so1:undefined symbol:ompi_mpi_real ;OSError: Could not load LIGGGHTS dynamic library. I have run "make makeshlib" and "make -f Makefile.shlib auto" with no error. I don't know how to fix it.
PS:My system is ubuntu 16.04
THANKS in advance.
If you could help. Best Regards

I am trying to make my own CAD file similar to the chute tutorial. I can model in SolidWorks and export as ASCII stl file. I do not understand what is "insertion face". Why is that important? and how do i obtain that?

Hello,

I'm trying to compile/install LIGGGHTS latest version but I'm having problem as followings: