adding two mesh generators

[starkeyk]

I am trying to create periodic boundary conditions on the displacement field and constrain one of the corner nodes to have zero displacement (to get rid of rigid body translations). I was able to do this in an older version of MOOSE (before mesh generators), but now I get an error

"Your MeshGenerator tree contains multiple possible generator outputs :
"sidesets and one or more of the following from an independent set: "ns1"

This may be due to a missing dependency or may be intentional. Please select the final MeshGenerator in
the [Mesh] block with the "final_generator" parameter or add additional dependencies to remove the ambiguity."

The way that I created the boundary side sets is using the SideSetsFromNormalsGenerator and to create the corner node I use ExtraNodesetGenerator with coord='0 0 0'. I think this error is referring to the fact that the side sets contain the extra node set that I am creating. For some reason, this wasn't a problem in the older code (I think the Dirichlet BC had precedence over the periodic BC's) but it is now.
Is there another way to implement these BC's?

[GiudGiud]

Hello

Could you please paste your [Mesh] / mesh generators block here?

Guillaume

[starkeyk]

[Mesh]
[./msh]
type = FileMeshGenerator
file = ../../test.exo
dim = 3
[]
[./sidesets]
type = SideSetsFromNormalsGenerator
input = msh
normals = '0 0 1
0 0 -1
0 1 0
0 -1 0
1 0 0
-1 0 0'
fixed_normal = true
new_boundary = 'top1 bottom1 front1 back1 right1 left1'
[]
[./ns1]
type = ExtraNodesetGenerator
input = msh
new_boundary = 'nodeset1'
coords = '0 0 0'
[../]
[]

[GiudGiud]

so the problem is that ns1 should take sidesets as input, not msh

Right now there are two final meshes, like two branches. MOOSE cant choose, so it asks for a final_generator parameter. But the fix is to create a single mesh incorporating both changes

[starkeyk]

when write sidesets as input to the node set generator I get the following error:

The following error occurred in the object "ns1", of type "ExtraNodesetGenerator".

Node set can not be empty!

[GiudGiud]

what about inverting the chain?
so msh -> ns1 -> sidesets

Also is there a node at 0,0,0 in test.exo?

[starkeyk]

there was not a node located at 0,0,0. I think it is working now with the following input configuration:

[Mesh]
[./msh]
type = FileMeshGenerator
file = ../../test.exo
dim = 3
[]
[./sidesets]
type = SideSetsFromNormalsGenerator
input = msh
normals = '0 0 1
0 0 -1
0 1 0
0 -1 0
1 0 0
-1 0 0'
fixed_normal = true
new_boundary = 'top1 bottom1 front1 back1 right1 left1'
[]
[./ns1]
type = ExtraNodesetGenerator
input = sidesets
new_boundary = 'nodeset1'
nodes = '1'
[../]
[]