LIGGGHTS® - User Forum

Hi,
Is there a way in LIGGGHTS to make granular chain? For example, to glue some granular particles together to make a chain.
Thanks,
Ram

Hi, I tred to install liggghts for the first time. (new to Linux as well).

After typing 'make fedora' in /src got a whole bunches of can't find files. I looked into the src directory, and they are all there.

make[1]: *** [memory.d]Error 1

memory.cpp:14:17: fatal error: mpi.h: No such file or directory
compilation terminated.then it leaves the directory
make[1] Leaving director ' /home/.../liggghts_1p4p3/src/Obj_fedora'
make: ***[fedors] Error 2.

Not sure how to proceed from here. Any help is appreciated

Hi

I am trying to develop a new version of fix_pour by combining the "regionExempts" function of pour/dev with pour. I have created a new pour called pour/exempt and copied accross all the relavent bits of code. I have also made the necessary links to these other files as well: mech_param_gran.cpp, region_block.h (and cylinder), fix_gravity.h, pair_gran.cpp and style_fix.cpp.

Hi all,

I am using compute pair/gran/local and the corresponding dump to look at the particle-particle contact data (and heat flow), but also need to look at particle-wall interactions. As far as I can see, these are not included in these computes/dumps?

I think this would be a very useful addition - I guess it would require assigning each wall an ID etc. In particular I need to identify particles in contact with the wall, and sum their heat fluxes etc.

Dear friends,
Could some body please let me know how can I apply rotation and translation (at the same time) to a moving mesh imported from a stl file. Any response will be truly appreciated.
Regards,
Carlos

Hi all,

I'm trying to set up a sim with a region of fixed temperature particles at the top and bottom, and particles that have variable temperature in between. The docs suggest I do not include adiabatic particles in the heat/gran fix. So I've set up a lattice of (4200) particles and defined regions as:

region upper block INF INF INF INF ${upper_limit} INF units box
region lower block INF INF INF INF INF ${lower_limit} units box
region middle union 2 upper lower side out

group thermal_group region middle
3000 atoms in group thermal_group

Hi everybody,
I would like to start the shear test using LIGGGHTS.
Could you help me in doing it.
I was using velocity command for the control of temperature. So far no success. I came to know about the shear test from the following message.
Many thanks in advance.
Samantaray

Tue, 11/30/2010 - 17:18 — tshan

Dear all,

I have already done some triaxial tests and simple shear tests, but I want to know the contact normal among the particles and then realise them in paraview to further generate the force-chain.

Hi Chris,
Could you give hints about the calculation of neighbors in LIGGGHTS?
I am using the following commands in the programme.
lattice fcc 0.0013
neighbor 0.00125 bin

It is creating
Total # of neighbors = 48418
Ave neighs/atom = 24.209
Neighbor list builds = 27

Hi

i need create 2 atoms with different youngsModulus parametr.

i try this:

fix m1 all property/global youngsModulus peratomtype 5.e7 5.e6

create_atoms 1 single 0.0 0.0 10.0
set atom 1 density 2000 diameter 2.0

create_atoms 2 single 5 0.0 10.0
set atom 2 density 2000 diameter 2.0

So i get that ERROR: Invalid atom type in create_atoms command
What's wrong?

Thanks
jikra

Hi, all

I just got an error with the 'fix' when running the LIGGGHTS examples:

fix m1 all property/global youngsModulus peratomtype 5.e6
ERROR: Invalid fix style

It seems the property/global is a LIGGGHTS style for the 'fix'.
The LAMMPS examples were done well, without any error, perhaps the LIGGGHTS was not invoked properly??

Any help is appreciated.