LIGGGHTS® - User Forum

LIGGGHTS® related topics can be discussed here: discussion about models, installation, feature requests and general discussion

Ced-cohesive energy density for cohesive powders

Submitted by davide1993 on Thu, 09/27/2018 - 15:40

Hello to everybody,
since I have developed particular interest in the subject of Cohesive energy density and the appropriate values for this parameter, I would like to ask if anybody could share some papers, experience, anything that could help about Ced.
Thanks,
greetings.
DDG

problem by deleting atoms (related: liggghtscommands, atom shrink)

Submitted by CM Jiang on Thu, 09/27/2018 - 04:04

hello everyone,

I am using CFDE to simulate the combustion process of particles. I wish the particlesl shrink after heating to 350 degrees and disappear after the radius is less than 0.003. I used two ways to solve the problem, but both got ERRORS.

1.way

How to insert completely random particles?

shivagoud's picture
Submitted by shivagoud on Mon, 09/24/2018 - 15:30

hi all,

I want to study the particles segregation in blender for which I need the initial state of particles to be completely mixed/random.
Does the fix style "particledistribution/discrete" create completely mixed state of particles or is there any other command?
Please let me know your suggestions.

Thanks,
Shiva.

Forces acting at the nodes of a mesh

Submitted by Arnon on Thu, 09/20/2018 - 10:43

Hi Everyone,

I have been trying to figure out this problem for a while now and I have not been able to find the solution.

What I have:
Particles impacting on a wall.

What I need:
The average forces acting at the nodes of the mesh for a certain number of timesteps.
Alternatively the stress acting on the elements of the mesh for those timesteps.

What I have achieved:
To print the stresses for the full mesh in a txt file.

How to control frictional force model?

Submitted by Mohammad Manjiu... on Thu, 09/20/2018 - 05:15

Hi,

I want to control the force model, It is now working as elastic after reaching the threshold it is plastic. If I stop the force my particle is going to initial position but I want to it's remains the same distance covered, again if I apply force it should be elastic again. For your better understanding please see the attachment pictures.

VORO++ compile and running issues

Submitted by qbbfjx on Wed, 09/19/2018 - 22:50

I am new to liggghts and voro. I was trying to compile voro++ in LIGGGHTS, the last step which is

make g++

shows errors as:

Makefile:106: recipe for target 'g++' failed
make : *** [g++] Error 1

I don't know why. Then I used

make mpi

which was working fine. I think I compiled voro successfully. However, when I tried to use compute voronoi/atom command and ran, it shows errors:

Invalid compute style

Can anyone help with this issues? It will be really appreciated.

Does LIGGGHTS 3.8.0 support multisphere superquadrics templates?

Submitted by Matt Muller on Wed, 09/19/2018 - 08:10

Hi Everyone,

I have been trying to figure out a way to pack particles with superquadrics and use that as a template for a multisphere superquadric. Does LIGGGHTS-PUBLIC currently support this kind of setup? Is saving a pack state and loading it even possible in general?

Kind Regards,
Matt

Glx extension

Submitted by Rimiggghts on Tue, 09/18/2018 - 10:21

Hello ,
I have a problem with the LIGGGHTS post processing process
I wanted to make a test with chute_wear but when I make : lpp dump*.chute , I have an error occuring : command lpp not found

Also when I run Paraview I have lots of error lines :
Xlib: extension "GLX" missing on display ":10.0".

May I have any suggest to fix these errors ?
Thank you !

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