How to calculate the forces acting on a geometry?

Submitted by mhk on Fri, 08/02/2013 - 03:42

How to calculate the forces acting on a geometry in LIGGGHTS? I need to sum up all the forces acting on all of pieces of my mesh. any help is appreciated.

Forums:

c00l | Mon, 08/05/2013 - 12:41

Hi,
have a look on this example. By this way you can safe the acting forces on your geometry in a file.

fix cad1 all mesh/surface/stress file Box.stl type 1

variable Fx equal f_cad1[1]
variable Fy equal f_cad1[2]
variable Fz equal f_cad1[3]

fix prfo all print 500 "${Fx} ${Fy} ${Fz}" file force.txt screen no

mhk | Fri, 08/09/2013 - 07:44

Thank you both for your reply. They talk about stress, I need to dump force, do you have any example for dump stl/vtk command that dumps forces?
I have no idea what these f_cad1[1]... are. could you please explain it more?
Cheers,

ckloss_ | Sat, 08/10/2013 - 00:02

>>I have no idea what these f_cad1[1]
it's the force on the mesh..see doc of fix mesh/surface/stress for details

Christoph