LIGGGHTS® - User Forum

Dear friends,

The installation of Liggghts and CFDEM following the instruction on this website (git and cfdemCompLIG) was successful on my PC (Ubuntu 14/04).
However, when I tried to install it on our university's server (CENTOS 6.3), it always showed an error:
-lstdc++ -o ../lmp_fedora_fpic
ld: cannot find -lbat
make[1]: *** [../lmp_fedora_fpic] Error 1
Log file is also attached.

Could anyone please tell me how to solve it? Do I need to install the libbat.so or make a symbolic link or other ways?
Thanks!

I want to simulate the one-way coupling condition ( solid particle movement in fixed flow field (water) ),
so I tried to add 'drag'& 'buoyancy' force (using fix drag & fix buoyancy).

But I have a problem with the 'fix drag' command.
the drag force depends on the velocity of solid particle, so it should be changed with the particle velocity, but in 'LIGGGHTS manual',

fix ID group-ID drag x y z fmag delta
(example)
fix center small-molecule drag 0.0 10.0 0.0 5.0 2.0

I have installed 3.4.0 version of Liggghts, and it did not read my restart file, a segmentation fault error accured.
Then I installed older version 2.3.6. this version had no problem in reading restart file.
however I have other problem with this version: particle crosses the stl walls after some steps.
I also have tried the latest version 3.5.0. but it doesnt read restart file too.
it will be so appreciated if somebody can help me by this matter.

Talat,

Hello all,

as I read in the newest release, it is now possible to calculate multisphere simulations with multicore processing.
So I updated the latest version and tried to simulate the multisphere example with mpirun -np 4 liggghts -in in.multisphere.
But it did not work.
Did I somehting wrong?

Regards,
Westbrink

Hello everyone,

I just updated from LIGGGHTS 3.4.1 to 3.5 and came across the following problem:

When using the fix "insert/rate/region" with option "all_in yes", my model crashes with the error "Fix insert: Region volume calculation with MC failed (../fix_insert_rate_region.cpp:101)".

With "all_in no", everything works fine. I was able to use the option "all_in yes" with LIGGGHTS 3.4.1.

Kind regards,
MiRa

Hello everyone,

I just found a problem when I tried to run following input file. It showed an error as below.
The strange thing is that the code works fine when I change the particle radius into 0.00036.
I'm not sure why increasing the particle size can solve this problem, and why the number of bins is related to the particle radius.
I'm very grateful if anyone can give me some comments or advice.
Thank you very much!

Jason

Hello,

I was wondering if it was possible to pad a restart file the same way I can pad my dump files. By example, I have :

dump dmp all custom 800 postLoading/loadingKiln_*.dump id type x y z vx vy vz fx fy fz omegax omegay omegaz radius f_Temp[0]
dump_modify dmp pad 6
restart 1000 restart/loadingKiln*

Is there a way to do something like :

restart_modify pad 6

So that my restart files all have the same number of characters and get in order?

Thank you very much.

Christine

Is there is a way to change the coefficient of restitution of particle collisions with a mesh area so that it varies depending on the wear it has received from particle impacts? I'm trying to create a model of shot-peening however, I can only seem to see how to change global settings to a user defined value.

Thanks,
Callum

I noticed that the command "compute contact/atom" dose not work for multisphere, but there is not any restrictions on the online manual.
So is there any alternative method that can track the average coordination number of a system composed of multisphere clumps?

Dear all
I have installed latest version of liggghts, but it doesnt read restart file, I know that this input file is running on other computer by liggghts version of 2.3.8.
I want to install 2.3.8 version. how I should do this?
any help is appreciated