LIGGGHTS® - User Forum

Hi all,

I encountered a segmentation fault when read_restart.
Can anyone help me find the cause?

The read_restart file "width12.pile" was not included in the attachment because of the size limit.

Many thanks,

Su

Hi guys, i have a problem with my simulation, I want to make a packing, the mesh has tets elements.
i don't know what is my problem

Hello,
I never worked with the heattransfer function of Liggghts and have an problem which I'm unable to solve.

There are two partickles types inserted continously. One at (type 1) 500°C and one at (type 2) 20°C.

dt=0.00001 s
fix ftco all property/global thermalConductivity peratomtype 80. 0.038
fix ftca all property/global thermalCapacity peratomtype 449. 1700.

The radius of particletype 1 is 0.5 mm and from type 2 is 0.7 mm.

dn_dump=1000 that means 0.01s

Hi,

I'm trying to use a compute in a variable. I know that a compute doesnt mean that it is calculated, so I want to use fix ave/time for calculation.


compute A thirdgroup reduce max y
fix currentstatus all ave/time 100 1 100 c_A
run 1
variable B equal c_A
print '$B'


this doesnt work. Just when I use the thermo_style it works:

compute A thirdgroup reduce max y
thermo_style custom step atoms ke vol dt etotal c_A
run 1
variable B equal c_A
print '$B'


Hi,

I am developing a numerical ring shear test. For that I am using a rectangular 3D box with a size of 8e-2 * 8e-2 * 4.4e-2 m. I fill this box with ~25.000 particles with sizes of 9.2e-4 to 16.4e-4 m. After settling under gravity I want to compress the probe with a servo wall and a target value of -5e6 Pa (in z direction).

My particles have follwing parameters, following Aigner et al., 2013 "Determing the coefficient of friction by shear tester simulation":

I am trying to install LIGGGHTS 3.1.0 but it throws the error:
multisphere_parallel.h: No such file or directory

Checked with the LIGGGHTS GitHub repo as well, but I found that no such file is there in the repo.
Kindly help

Hi all,

Can anyone help me in working with assigning external electric field ?
I could not find much information about this part, like how am I supposed to change the source code in setting the E-field direction?

Thank you.

Dear all,
I used to calculate lift force by Archimedes and the value is 0 0 5.13126e06(it equals to volume * density *9.81 ). The value is only at positive z direction. But today I update the CFDEM software. and i found the lift force calculated by Archimedes force model is not the same, x y z three direction all have values. Who can answer my confusing?

Thanks
xiaobaishu

Dear users,
Do anybody know how to use voronoi package? I compiled it in my liggghts, but it didn't work. I want to calculate the voidage. or is there any other command to calculate void ratio?

Hi

I was going through some tutorial in the website and found wear through a chute. Though it shows colors changing with time due to wear in the surface of the metal, the unit of wear is not there.

How much time it takes to develop a wear on a surface. Is it material dependent/time dependent/impact velocity dependent?

How do i understand the estimate of time of simulation to develop a wear on a surface. Any info regarding these will be helpful.

Thanks in advance.

Saprativ