LIGGGHTS® - User Forum

command: git clone http://cfdem.git.sourceforge.net/gitroot/cfdem/liggghts myliggghts

error:
Cloning into myliggghts...
fatal: http://cfdem.git.sourceforge.net/gitroot/cfdem/liggghts/info/refs not found: did you run git update-server-info on the server?

plz help me out to solve this problem. i have also allowed port 9418 through firewall

I have an STL file that I want to pack with particles, I have noticed that the region command seems to only take .vtk files as input. Am I missing a parameter for an STL file or is this the case? Secondly, if it only takes vtk files then what programs are available to convert an STL to VTK file format? I tried saving the STL as VTK in paraview but it didn't seem to work properly.

Austin

Hi Christoph,

I've got a question about load balancing. In the pdf you uploaded (conference in Trondheim) there is something showed about load balancing. It seems already implemented into liggghts but I didn't find anything about it in the manual. Could you give me an advice where to find if if it is already implemented.

Hi everyone,

the case I am simulating consists of a bunch of particles stirred in a tank. The geometry of the stirrer is available in stl format.

I would like to calculate the torque exerted on the stirrer or the axle moving it, respectively. I've played around with fix mesh/gran/stressanalysis and its capabilities are almost what I need. Is there a way in liggghts to integrate the stresses such that I get the resulting torque on the axle?

Thanks for any comments.

Best regards,
Moritz

I have tried to calculate coordination number for a compact data-set with the command compute/cord/gran and got a very low number so I decided to write separate code and do this calculation. I considered two particles to be neighbors if their distance is less than or equal to the sum of their radii and got a reasonable result. I don't know why there is such a difference.

Hey Christoph,

I don't get where the coefficientFriction is used in gran/hertz/history formula, according to the formula given in pair_gran.html file there is no need to this quantity.

I am having an issue with particles falling through a wall. Particles begin in a cylinder and are poured directly downward into a block. Most of the particles are caught by the block, but on the first iteration about half of the particles fall through the block when they are first inserted. Is there a reason that these particles fall through? Would the problem have to do with the specified regions or possibly the fix wall/gran/hertz/history?

Thanks
Kirsten

I created a new geometry using AutoCaD and exported it as ASCII stl file. I am using the file in my LIGGGHTs input script. When I run the simulation I get the below error message

Importing STL file 'geometry.stl'
Solid body detected in STL file
End of solid body detected in STL file.
ERROR: STL import failed at triangle #0 (line 1), degenerated triangle?

Can anyone please tell me what this error is about and how to fix this error?

Regards
Vinodh

Hi Christoph,

I am thinking about using the Particle segregation in a slot geometry example for my simulation after doing some changes to it to fit to our simulation.

It will be of great help if you can please share the input script for the Particle segregation in a slot geometry example that is there on the LIGGGHTs website.

Thanks!

Jai