LIGGGHTS® - User Forum

Hi,

I want to insert cylinderical particles in my system and I've read all the discussions in the forum about multispheres. unfortunately they didn'e help me.
I'm not familiar about making molecules clumps and using fix rigid. can anyone help me about generating and inserting non-sphere particles step by step?
an example script could be very helpful.

BTW I have STL of my particle, but I'm not sure if it could be helpful!

Thanks,
SHG

Hello,
unfortunatly, I didn't find a good answer for this problem.
Is it possible to assign a temperature, when an particle is created.
Im trying to simulate the temperatur transition of two diffenent particletypes, while they are mixed. Therefore, the "fix heat/gran" command is not usable.
I know, that it ist possible to assign a velocity, but I wasn't lucky, searching for it.
It might be done with the set "region xy temperature T" command. But thats not a satisfactory solution.

I hope someone can help me.

Thanks
RobertG

Hi,

I am trying to do a problem similar to example in.mesh_tet. While executing in liggghts, I repeatedly get the error message "Set command with no atoms existing". While running the in.mesh_tet example there was no problem like this.

I am attaching my command file, model and log file.

Can anyone please help me with this problem?

Hi all,

I want to find the maximum y-coordinate of the particles in my model during the simulation run. Can someone help me or give me any clues?

Many thanks,

Su

Hello!

Hi,

I have to define a global variable in Pair_gran_hooke to be used in a compute source file. I have tried many ways but I did not succeed. How is that possible?

Thanks
Mohammad

Is there a possible way to know the number of contacts of each and every particle(may be with the wall or with the other atoms) and write the data(total number of contacts) into a new file?
I tried to follow this FORUM TOPIC but I couldnt figure it out : http://www.cfdem.com/forums/contactatom
It was printing only zeros for every ntimesteps.

Thank you.

Hi,

I have to detect the enduring contacts, so I have to apply criteria which identifies which one of the neighbors are in tight contact. I suppose I have to modify the source code but how is that possible ?

Thanks
Mohammad

Hi, All

I want to use the command 'fix move/mesh mesh linear/variable' to compress a sand pack.
What I've done is:
variable yl equal -0.5*v_dy
fix moveleft all move/mesh mesh left wall linear linear/variable 0. ${yl} 0.

I've also tried using v_yl instead of ${yl}.
However the error says: variable name 1 for fix move/mesh linear/variable does not exist.

Appreciate any help!!

Hi all,

Is that possible to allow a certain level of overlap between particles without generating interaction force? Suppose I have two particles with radius R1 and R2 positioned in a distance of d