Post Processing

starting LIGGGHTS memory optimized parallel post processing
chunksize: 1 --> 1 files are processed per chunk. If you run out of memory reduce chunksize.
Working with 1 processes...
calculating chunks 1 - 1 of 54
dump is already unscaled
aborting due to errors: 'id'
>>>

How can I fix it? Thank you

Hi all,
When I watch a simulation in paraview this one runs very slow. is there any way to speed it up in order to see the particles moves at a velocity more realistic?
Best

Up to now, the amount of data I was working with from LIGGGHTS was actually pretty limited. I would take the final state of a liggghts run and import the dump into MATLAB and then do some data manipulation to get things I wanted. But now I'm trying to get the time-evolution of some values, like average coordination number. Anyone know if there's an easy way to get average values of liggghts atom data after I've got the vtk in paraview?

Hi!

I have simulated flow of particles in the influence of gravity using LIGGGHTS. I am using ParaView for post processing.

Could anybody advice on
1. How to count the number of particles passing through a plane?
2. How to get the coordinates of the particles passing the plane?

Regards,
Tamoghna

Still a work in progress, but this python plugin will convert dump files (and stl's) from Liggghts to Ensight .case files

https://sites.google.com/a/ensight.com/user_defined_tools/liggghts-trans...

I can get the particle positon through the dump x y z command. But I want to get the plot of a certain particle position related to the timestep. How can I get the plot in the paraview.
The plot grobal varibles over times command is closed to my destination, but there are only three varibles which I can choose, no positon information. what should I do to get it?

Thanks for help anyway

Thanks,
Zhao

Hi,

I have a DEM code of my own and I would like to use ParaView to postprocess the results. I have been following the procedure for converting LIGGGHTS dump.* files to *.vtk files, and my ultimate goal is to figure out the format of *.vtk files for DEM type results. The problem is when I convert dump.* file (e.g. dump.cohesion) to run through the pizza.py process, it could read the dump file but there is an error showing as follows:
reading dump file...
800
read 1 snapshots
1 snapshots selected out of 1

Hi,

I'm adapting the settlingTestMpi tutorial case to work with interfoam (2-phase VOF).

It works fine in general, the only problem is that I get a space shift in paraview when looking at actual particle position, and voidfraction value in the CFD grid.

I made sure that I capture the same number of snapshot in both DEM and CFD (and the shift is always the same).

Somehow, I think the CFD is lagging 1 time step behind DEM. I guess it comes from the 0 time step ...

Where could it come from ?

Thanks !
Joris

Dear all,

I use CFDEM to run the tutorial, then in case fold:

/CFD: there are data saved in the fold under different time (e.g. 0.1 0.2)
it is ok to use paraFoam to show the results.

As shown in the attached picture.

Either the coordinate of the surface in stl file or that of region set in in.simulation file is right, and the simulation results are also right. When I use paraview to demonstrate either of them, the figure is ok, however when I use paraview to show both of them (the wall and simulation results) at the same time, the problem is involved as shown in the picture.

Thanks for your help in advance.