LIGGGHTS® - User Forum

what atom style should be used to have cubic particles for segregation.Will superquadrics atom style work by specifying blockiness of 300?

Hey guys,

Is it possible to do a fix command in a defined region (within the simulationbox) or is there a way to do a fix-command in a loop or in an if-condition? I tried different ways but it does not work.

Thank you!

Dear community,

I created new contact model and want to verify with analytical/numerical solutions. Does anybody know how to create particles (2 or 3) with predetermined position (known center and radius)?

Best , regards Furkhat

Hi,
I am interested to know method/s to calculate coordination number for superquadrics. The following commands are existing and are meant for spheres:
(compute contact/atom
compute contact/atom/gran
compute coord/atom)

Thanks,
Sounik

Hi,

I am very new to this filed and I am planning to simulate the powder spreading process.
I have a question about what the insertion region mean? Why we need to set that?

Thanks,
Mill

Good morning,

I am using the next and jump commands to iterate over values of some variables in my input file. It was working ok so far, but now sometimes I find that the command just seems to "skip" some values of the variables. In the following set of variables it jumped from a=43 to a=45. Someone knows a reason for it and how to fix it? The skipping seems to be made over all the 4 variables at the same time.

Excerpt from my input file (attached):

Hey everyone,
I'm not sure if this is a problem, but if I create more than one liggghts object (or reinitialise an existing/closed one) I get the following warning:

Hi, RICHTI83!

I always appreciate your sincere comments and help. I've been using 'LIGGGHTS-WITH-BONDS-master' for a while.
Meantime, I was back to examples and tried the beam example. I could run it without any errors.

But the behavior of beam motions is quiet different with your video on Youtube. Only tip particle was broken at a certain time and dropped.
It seems that the force is not transferred properly to the neighboring particles.

Hello everybody,

I want to simulate particles glued to a wall. Is there a way how I can completely restrict rolling (so that omega=0) for these particles? Translation should still be allowed, as the mesh moves horizontally via the viblin command.

My approach so far is to set the rolling friction and wall friction values extremely high (I used a value of 1000); however, omega still is not zero. I also used a cohesion model, but the particles still rotate a little. Does anybody have another idea?

Hi,
I am currently facing a problem with liggghts hopefully someone can help me.

I need to identify or separate particles which are not part of a heap. Therefore, I would like to delete particle without a neighbor.
Is it possible to extract this information from the neighbor list? How can I do this?

Regards,

Alexander