LIGGGHTS® - User Forum

I apologize in advance for not knowing how to do this -- I would imagine this is pretty simple for someone who knows what they are doing (this excludes me, apparently):

I am trying to develop a sintering interaction (pair_gran_sinter.cpp) for LIGGGHTS 1.4.6, and I need to ensure that it is conserving particle volume as the particles sinter together (see movie below for example). To do this, I need to store an array of initial particle sizes (radii) such that it is available to pair_gran_sinter.cpp for subsequent volume and updated radius calculations.

I installed LIGGGHTS in my local LIGGGHTS directory (myliggghts).
step 1 git clone git://cfdem.git.sourceforge.net/gitroot/cfdem/liggghts myliggghts
My system is Ubuntu.
But in the /src directory, when type "make fedora" ,
make[1]: Entering directory `/home/cheng/LIGGGHTS/myliggghts/src/Obj_fedora'
Makefile:93: angle_charmm.d: No such file or directory.....
.
.when type"which mpirun", message is "/usr/bin/mpirun"

And I can not find the ./lmp_fedora

So what can I do to install successfully?please help me

cheers

cheng

Hi,
I want to visualize force network in grains by paraview. How can I dump force so that paraview can show force chain network?
Thanks for help in advance...
A

hello everyone,
we know that the liggghts has the function in calculating conductive heat transfer between colliding particles.
does liggghts have the avaiable function used to calculate conductive heat transfer between particle and wall when they collide?
thx.
S.L

Hi all

I wish to use an other material for the walls then for the particles, e.g. particles > glass, walls > Al. Under the fix mesh/gran I can specify the walltype by setting the number (ID) of the atom type. I did the following steps trying to use a different wall material:
1) read data file: 3 atom types
2) read data file: define the coordinates and properties for the 2 existing atom types
3) for fix property/global I spedified 3 youngsModulus, 3 poissonsRatios, 9 coefficientRestitution, 9 coefficientFriction and 1 characteristicVelocity

hi, all

now i want to simulate this process that single particle impinges on the bonded material to see the micro-crack on the material. so, i want to know whether it is hard to simulate the bonded material like ceramics with the relative properties. thanks.

cheers

huan

Hi,

i've followed the installation instructions given in the installation tutorial for ubuntu. But when I try to run an example case, such as "liggghts < in.conveyor" I get the output: "liggghts: command not found". What could be the problem and how can I solve this?

regards
Rudy

Hi all,

I have a simulation in which I calculate the average per particle force and use it to control the sim, i.e.

compute avg_f all reduce ave fx fy fz
variable mag_ave_f equal sqrt(c_avg_f[1]^2+c_avg_f[2]^2+c_avg_f[3]^2)

Hi,
Is there any way to dump force (weight) on wall of container due to all particles (if I dont want to use mesh)?
Thanks in advance,
Ram

Hi everybody,
The output file of the following programme dumps lot of zeros even in atomic ids.
Could you give some explanation?

###### programme starts here ##########
units si

atom_style granular
atom_modify map array
boundary f p f
newton off

# Read data
read_data Ordored_Liggghts_long.sys

set group all diameter 0.10

communicate single vel yes

neighbor 0.001 bin
neigh_modify delay 0

#Material properties required for new pair styles