Confused over response to two mesh/servo loadings

Submitted by pfalkingham on Thu, 10/25/2018 - 11:29

Apologies if this has been covered elsewhere, I did do a search of the forums first.

I've got a test scenario where I'm compressing a particle bed with a servo-controlled mesh. I've run it at targetVal 5 and targetVal 50, but the results are quite different:

https://youtu.be/EBcXjh_FZ9A

I expected targetVal 50 to be similar to the sim on the left, but with forces 10x greater. As you can see, I'm not even getting forces oriented normal to the compressing plate.

Is this normal? Am I doing something silly somewhere?

I've attached the run file for targetVal 50. targetVal 5 is identical except missing the 0 in that place. I've also attached the particle generation portion I use in case anyone wants to test it.

arnom's picture

arnom | Thu, 11/15/2018 - 15:42

Did you verify the forces on the mesh? You can plot the stresses when using a dump mesh/vtk and you can also use the output vector of your mesh fix to determine the current force value. What do you see there?

DCS team member & LIGGGHTS(R) core developer