LIGGGHTS® - User Forum

Hi Everybody,

It's been a while since my last update of Liggghts because of labwork and holydays, but yeesterday I updated my LIGGGHTS from 1.03 to 1.16 and made minor changes in my simulation (adding a dump for wall-stress).

However my results now look totaly different than what they looked like in 1.03 (see videos: www.yrthy.de/1_16.avi and www.yrthy.de/1_03.avi). It seems that the particles lost their cohesion.

Hi everybody,

I'm running a simulation for the compressing a soft material between a static wall and a moving-mesh-wall. The wall is moving with a constant speed.

Is there a quick way to get the overall force with which the mass ist pushing against the wall?

regards,
Martin

The download page says "The download section is on the bottom of the page. You have to login in order to have access to the download section! If you do not have an account yet, please register for free.", but I am already logged in!

Ideas? I tried two different browsers (Chrome/Firefox).

Hi,

I have a simulation where my wall geometry is a variable (eg where I want to change the value for the angle between two flat bits of my wall mesh)
Is there any way I could do this? I tried putting this as a variable in my stl file but I do not think it worked

eg
facet normal sin(${thita}) 0.0 -cos(${thita})
outer loop
vertex 0.02 0.0 0.0
vertex 0.06 0.06 0.04*tan(${thita})
vertex 0.06 0.0 0.04*tan(${thita})
endloop
endfacet

Dear liggghts users,
When I am generating restart files using liggghts, I am not able to convert it from binary file to data file.
It is showing me "Restart file version does not match restart2data version". I checked with many versions but still end up in same error. Can anyone tell me how to convert liggghts restart file to data file.
Thanking you

Shantanu Maheshwari

Although liggghts runs perfectly well, just need some advice on how to optimise runs for speed (particularly for granular flows with many particles).
Best regs,
BrianW

Big fat disclaimer:
I come from a Slackware background, but since I expect most LIGGGHTS users out there to be running RHEL/Scientific Linux/CentOS/Fedora, I have made two assumptions regarding the build variable used by automake/autoconf in OpenMPI and FFTW. Replacing "--build=x86_64-redhat-linux" with something suited to your distro should be trivial. (To find out what build variable you should use for your distro, execute the command "gcc -v" and look in the output for "--build=".)

Assumptions

Hi all!
i created a box and divided it into two parts(regions).The particles are poured in one region and are made to move into the other region and the particles can be seen moving in paraview.But when i see the dump file(region), all the particles are shown in the same region and they do not change their region with the passage of time.As the region is a static command, Is there any solution of this ? Actually i want to know the number of particles in each region after some specific time intervals.
If anybody knows please help.Thanks
sajjad

Hi all
i want to know that is it possible to wiggle an imported mesh wall by using the " wiggle " command.
if any body help, i will be thankful.
sajjad

hi all ! i am new comer in liggghts. i made a box and then divided it into two parts by importing an mesh wall(STl file).
I poured the particles on one side of the box. When i applied wiggle command the particles penetrate into the imported wall and cross it. i want the partcles should not cross the wall. there is my input file. If anybody help me i will be thankful.
sajjad

# Wall import from CAD

atom_style granular
boundary f f f
newton off
atom_modify sort 0 0

communicate single vel yes
units si

region reg block -0.01 0.51 -0.01 0.25 -0.01 1.31 units box