DPF: scoping on named selection operator doesn't work

dafedin · July 2023

Hello all,

When I was trying to use dpf.operators.scoping.on_named_selection() in my script in Mechanical, I encountered a problem while trying to access the named selection’s data. I have two named selections in my model:

1. ns_tree (created in model tree using Mechanical interface);

2. ns_apdl (created via APDL -script).

The both are present in solver components names and node id is accessible via APDL -script as well. Then, I try to get node Id via DPF-script:

import mech_dpf

import Ans.DataProcessing as dpf

import os

mech_dpf.setExtAPI(ExtAPI)

analyses = ExtAPI.DataModel.AnalysisList

analysis = analyses[0]

analysis_dir_path = analysis.WorkingDir

path = os.path.join(analysis_dir_path, 'file.rst')

dataSources = mech_dpf.GetDataSources()

op = dpf.operators.scoping.on_named_selection()

op.inputs.requested_location.Connect('Nodal')

op.inputs.named_selection_name.Connect('NS_TREE')

op.inputs.data_sources.Connect(dataSources)

my_mesh_scoping = op.outputs.mesh_scoping.GetData()

print(my_mesh_scoping)

The DPF-script works fine only for named selection, created via Mechanical interface, but not for named selection, created via APDL. In the case of named selection, created via APDL, I get the following error message:

scoping_provider_by_ns:0<-error: GetScoping -Failed to read the named selection or the named selection is empty-:line 22

Hence, for DPF, the named selection, created via APDL, is empty or not accessible! Is it a known issue? Is there a workaround?

dafedin · July 2023

Hello all,

The solution has been found! Now it is clear, that in the code proposed earlier named selection's location is unknown. The following code gets the entity data regardless of the type of named selection:

import mech_dpf

import Ans.DataProcessing as dpf

import os

mech_dpf.setExtAPI(ExtAPI)

analyses = ExtAPI.DataModel.AnalysisList

analysis = analyses[0]

analysis_dir_path = analysis.WorkingDir

path = os.path.join(analysis_dir_path, 'file.rst')

model = dpf.Model(path)

nsName_nodal = model.AvailableNamedSelections[1]

scoping = dpf.MeshScopingFactory.NamedSelectionScoping(nsName_nodal, model)

scoping.Location = 'Nodal'

dataSources = mech_dpf.GetDataSources(0)

stress_X = dpf.operators.result.stress_X()

stress_X.inputs.data_sources.Connect(dataSources)

stress_X.inputs.mesh_scoping.Connect(scoping)

my_sx = stress_X.outputs.fields_container.GetData()

sx = my_sx[0].Data

print(sx)[0]

I hope this insight is helpful to the community.

Thanks for all and regards

Rajesh Meena · July 2023

@dafedin I could not reproduce this.

Make sure you see the components in solution worksheet and make sure you use component name with all CAPITAL letters when trying to get scoping for it.