Order of FieldContainer's data

[PanekOndrej]

Hi everyone,

I found out, that FieldsContaintainer's data are in different order compared to MAPDL printouts. Is there any ellegant way how to sort the ElementalNodal results in the same order as Mechanical (e.g. PRESOL, S, COMP that gives for 20-node solid results in order Element1: Components in nodes I-P, Element2: Components in nodes I-P ... )?

ELEMENT= 1 SOLID186
NODE SX SY SZ SXY SYZ SXZ
1 1.3263 284.93 -39.084 -16.892 -43.007 4.0296
262 21.590 351.41 -6.1419 -25.433 -5.2396 1.8689
323 21.515 386.07 -9.9333 -3.8139 -0.21751 3.6931
325 16.530 327.33 -16.098 -2.5938 -0.23076 13.250
114 -2.6839 254.75 -36.265 -14.772 -91.788 4.9086
318 15.213 348.90 -1.8150 -24.207 -25.527 5.0770
322 2.2081 370.61 -14.374 -5.8494 -8.7611 1.0131
329 4.8359 317.03 -21.273 -3.3133 -14.164 5.8482

ELEMENT= 2 SOLID186
NODE SX SY SZ SXY SYZ SXZ
1 11.011 294.04 -36.009 -12.592 -33.715 12.915
325 38.955 341.07 -6.8376 -4.9140 1.0630 17.036
323 34.593 390.75 -10.829 -4.5121 0.30133 1.1660
262 27.949 354.76 -7.7270 -14.852 -2.7532 1.7589
2 30.410 310.29 -24.320 -1.1019 -39.836 4.8410
327 43.250 336.58 -17.072 -0.67958 -0.99439 3.8806
324 40.006 385.74 -19.990 0.12635 -2.7101 5.0058
263 58.894 386.73 18.833 4.3321 -3.5496 0.38066

and averaged results (e.g. PRNSOL, S, COMP)?

NODE SX SY SZ SXY SYZ SXZ
1 -11.914 128.40 -28.133 -10.570 -75.435 3.1811
2 -14.178 117.61 -35.533 6.7231 -83.941 6.8971
3 28.375 -301.34 24.229 17.638 -36.117 4.4236
4 33.115 -289.88 35.071 -15.315 -36.145 1.1863
5 -1.0247 35.169 5.9328 -0.85126 -72.325 -6.3782
6 1.6989 36.430 9.7768 1.8942 -72.843 6.8301
7 -0.84983 -169.72 -4.8835 -3.3034 -51.890 -4.8353
8 -8.6473 -183.54 -16.923 4.3810 -53.359 4.3550
9 0.43478 -34.304 -7.0810 -0.45373 -51.191 -0.90355
10 -0.32724E-001 -33.986 -8.5274 -1.1628 -49.457 -0.21620

Best regards,
OP

[rlagha]

@PProfizi please could you provide an example using the sort operator? @PanekOndrej , please let us know if this is your request?

[PanekOndrej]

Yes, I couldn't find any documentation about "sort" operator before. It seems that "ascending_sort" operator, that will be available in new version of ansys.dpf.core package (>= 0.5.0) will solve my problem, right? ("ascending_sort" raises AttributeError in 0.4.2)

[PProfizi]

Hi @PanekOndrej ,
To sort the nodal averaged output of an ElementalNodal field according to a sequence of node IDs, you can indeed use the sorting operator using a nodal scoping (such as the element connectivity) like so:

from ansys.dpf import core as dpf
from ansys.dpf.core import examples
from ansys.dpf.core.operators.logic import ascending_sort

model = dpf.Model(examples.download_piston_rod())

# You can first define an ordered list of elements of interest
elemental_scoping = dpf.mesh_scoping_factory.elemental_scoping([1, 2])
# You can then potentially get the ordered list of node IDs for these elements
connectivity_ids = dpf.operators.scoping.connectivity_ids(mesh_scoping=mesh_scoping,
                                                          mesh=model.metadata.meshed_region).eval()
# You can then extract the nodal averaged stress values as a field, on this nodal scoping
nodal_stress_field = model.results.stress.on_mesh_scoping(mesh_scoping=connectivity_ids).eval()[0]
# To force the data to follow the scoping order, you can then use an ordering operator such as:
sort_nodal_by_connectivity_scoping = ascending_sort(field=nodal_stress_field,
                                                    sort_by_scoping=True).eval()
# When printing out the data, it is ordered according to the nodal scoping used 
# (here connectivity, but could be a custom scoping)
print(sort_nodal_by_connectivity_scoping.data)

The ansys.dpf.core.operators.scoping.rescope operator should also be able to force the reordering of your data according to a scoping of your choice.

Does this answer your question?