LIGGGHTS® - User Forum

Hello,
im modeling an continous mixer and have two different particle types.
I continously inserte particles at two different location and the mixed up particles leaving the mixer at the same place.
Now the problem. Because of the continously use, there are build more and more particles.
Is it possible to delete all particles, which are at the same area (exit of the mixer).
I have tried it with the delate_atome command and wasn't very successfull.

If anybody can help me. I would be very grateful.

Best regards
RobertG

Hi All,

I want to draw a cylinder, with its wall made up of particles. Is it possible to draw this in gmsh?
or please suggest any other software.

Any help will be much appreciated.

Thanks,

Narendra

Hi all,
I generate a rigid body shaped like a box with moltemplate and simulate a droptest. The problem is that the body jump's after contact with the mesh to a height that is not in relation to the physical law. k = square root (h'/h)
Restitution coefficient: 0,5
Previous height: 0,5 m
Height after first contact: 0,27756295 m
According to the formula the body should just jump to a height of 0,125m.

Hey guys,

Hello again,
I'm working with a program, based on the tutorial Continuous Blending Mixer.
My Problem is, that at the insertion area, the particle start to "explode" at a certain time.
That means, some of the particles are going through the wall of the .stl-file.
The starting velocity of the particles is high enough to avoid, that some of the old ones are still in the area, when the new ones are created.
I'm shure, that the area they are created is not too small and there is plenty of space between the the area they are created and the wall.

Hi all,

In the doc of DEM simulation, the effective shear modulus is:
1 2(2+v1)(1-v1) 2(2+v2)(1-v2)
-- = ------------------ + -------------------
G Y1 Y2

but, the in the global_properties.cpp, line 217:
matrix->data[i][j] = 1./(2.*(2.-vi)*(1.+vi)/Yi+2.*(2.-vj)*(1.+vj)/Yj);

The above two don't match, which one is wrong?

Appreciate any help in advance!

Hi guys,
What happened wrong when there is a erro message like Internal error (tri_mesh_I.h:90)? Thank you in advance for your answers
Cheers,
Zyan

I am using a cylinder region to add external force in a domain. The script for the domain is a s follows

region a cylinder z -0.343 -0.004 0.6 -0.4025 -0.2375 units box
fix push all addforce 0.0 0.0 -0.1 region a

Is there any error in the script. Please help me out.

Thanks in advance.

Hi all,
this might be an easy one for some of you, but I can't figure it out.
Basically I want that all particles are fixed/stationary throughout the entire simulation.
Thank you soo much

I am trying to incorporate two separate force fields for two separate block regions in a single input script as I need to giving force in two separate regions

I am using the following script for one block

#zone 1
region spray block -0.0295 0.0555 0.2 0.24 -0.016 0.014 units box
fix push all addforce 0.0 0.1 0.0 region spray

I tried to add the same set of commands for the other for the other zone but its giving error

#zone 2
region spray block -0.01 0.05 0.3 0.4 -0.06 0.01 units box
fix push all addforce 0.0 0.1 0.0 region spray