LIGGGHTS® - User Forum

Hello community!

I am currently working on a test-case script for my Master Thesis. After a while, I started to get along well with case inputs and setups, and that's not a big deal.

At the moment, my biggest challenge is the calculation of the Lacey Index and the approach to calculation. The principle of calculating the mixing index is clear, how to approach the problem and how to start post-processing is quite difficult for me.

Hello,

I am doing rotating drums simulation. For my research, i don't need to include particles filling position. What I need is data from particles adjustment to end.

I know It can be done in preprocessing after simulation however repeated particles id makes is little bit complex. Further, manual process can loose particles information.

I am wondering whether there is such steps in liggghts so that I could ignore particles filling positions in dump file.

Thank you

Hi,

I am running screw-conveyor LIGGGHTS simulations on our University cluster and everything was fine the first week. But now I am running into this error (shown below and attached). The log file has no errors and the same input file runs fine in another Linux system. Can anyone help me figure out what the issue is? Thank you in Advance.

ERROR: In /build/vtk6-9ueea8/vtk6-6.3.0+dfsg2/IO/Legacy/vtkDataWriter.cxx, line 163
vtkRectilinearGridWriter (0x555bb7c3b9a0): Unable to open file: post/pellets_boundingBox_295000.vtk

Hello folks,
I am trying to simulate linear and rotational motion of roller through code but not getting these motion together, The code that I have run is the following :

######

fix Moveroller all move/mesh mesh roller rotate origin -0.2 0. 0.118 axis 0. 1. 0. period 0.966645 #second
fix MoveRoller all move/mesh mesh roller linear 0.65 0.0 0.0 #cm/s
run 200000
unfix MoveRoller

######

Hello everyone,

Hi Guys

I am from South Africa, with our power issues (load shedding) I am unable to perform my required analysis on LIGGGHTS. The simulations take far too long and once the power cuts my simulation essentially stops. I know about the restart files however with the input file I have it is not feasible to use the restart routine.

I am able to rent an Ubuntu Server locally which would fit my needs. Has anyone been able to install LIGGGHTS on Ubuntu Server?
I know there is no GUI for Ubuntu server however this can be installed from what I understand.

Hello, I have the problem that I regularly get a "Segmentation fault" in my simulations. When I start the simulations several times, some of them run without problems. But most of them abort with a "Segmentation fault".
I use a cluster on which PBS is. The CPU is a Xeon E5-2630 v3 of which I use 16 cores. Liggghts version LIGGGHTS-PUBLIC 3.8.0.

Hi,

I am trying to build Liggghts 3.8.0 on Ubuntu 21.10 using make auto and get an 'invalid static cast' error. I attached a screenshot of my code for your reference. I looked for this error but did not find any related questions on the forum. Can you please help me resolve it? Thank you in advance.

I want to apply capillary forces to the particles, so that I particles attract each other. How shall I achieve that like what model shall I use? and what other properties do I need to manipulate? Any leads will be appreciated.

Hi Guys

I have a situation where I need to measure the mass of particles which are divided into two types, each type has a range of particles.
Below is the code which I developed. I have made a group called "large" which consists of type 1.
When I try and print out the mass of the type 1 particles and resulting csv file only has 0 values.

I do get results when changing the "large" to "all" when measuring the mass, however this does not help me.
Can someone please assist in explaining where I went wrong.