Mesh Geometry removal

Submitted by SHUBHAM AGARWAL on Thu, 12/24/2020 - 20:58

Hi
I am currently using liggghts-flexible fiber version. My question is related to the shear_box tutorial for the same.
Similar to the above tutorial, I first deposit fibers in a confined volume, then compress the fibers from above. For the wall geometry, I am using the .stl files. Once the assembly is fully compressed, I create bonds between the fibers. So, we now have a cross-linked fiber network.
For my subsequent analysis, I wish to use the resulting fiber network geometry only. How can I remove the non-required walls from the analysis. I tried unfix and fix_modify but they did not work.

Thanks
Shubham

mschramm | Sat, 12/26/2020 - 05:05

Hello
to unfix geometries you need to do them in reverse order with all commands that utilized them (dump commands, move commands, and others).
Assuming the shear box tutorial's in.settle script, to unfix all of the geometry, you would do the following: (Make sure to use a new thermo_style command as the fixes will no longer exist...)

unfix outfile
undump stlbotshear
undump stltopshear
undump stlbothalf
undump stltophalf
unfix wall
unfix TopHalfShear
unfix BotHalfShear
unfix TopShear
unfix BotShear

thermo_style custom step atoms numbonds v_sim_time cpu cpuremain ke
thermo_modify lost ignore norm no