Plotting von mises stress results for individual Named Selections in pydpf post

Karthick RAJAN

Hello All,

Thanks for Helping, I am facing an issue while developing a code to plot the von mises stress results for each Named selection separately. (Big model with 10 components) I would like to have a code in pydpf post such a way that for each Named selection (NS created for each components), von mises stress (should display only one NS at once, not in an assembly format) with max and min data should be plotted. As of now my code can read a .rst file and plot for each Named selection but in assembly level.

Pernelle Marone-Hitz

@Karthick RAJAN Not sure I fully understand your issue here. This example might help: https://post.docs.pyansys.com/version/stable/examples/01-Detailed-Examples/01-named-selections-modal-simulation.html Then

Karthick RAJAN

In the example provided by pyAnsys, there are 4 named selections, when plotted, Bar 1 is contoured and other bars are not contoured but all the bars are displayed. I need to display only Bar 1 contoured and not the other bars shaded grey. Is there any option to do the same?

Pernelle Marone-Hitz

Got it. I'm afraid that there is no direct solution. Possible workaround would be to grab the field of results and the corresponding mesh for the named selection, and plot this as if it was a separate result (ie, use the mesh of the named selection and not the mesh of the whole structure).

Karthick RAJAN

Thank you @Pernelle Marone-Hitz for your quick response. I will explore the work around that you suggested.

@Ayush Kumar do you have any suggestions on the same?

Ayush Kumar

@Karthick RAJAN the way suggested by @Pernelle Marone-Hitz is the only way, you need to create a mesh from the named selection. Here is a basic example, you can build upon this:

from ansys.dpf import core as dpf
from ansys.dpf.core.plotter import DpfPlotter

dpf.start_local_server(ansys_path=r"C:\Program Files\ANSYS Inc\v241")

rst = r"D:\...\file.rth"

ds = dpf.DataSources(rst)
model = dpf.Model(ds)

# Get Mesh Scoping
ns = dpf.operators.scoping.on_named_selection(requested_location="Elemental", named_selection_name="SEL_ELM")
ns.inputs.data_sources.connect(ds)
my_mesh_scoping = ns.outputs.mesh_scoping()

# Get Mesh from Scoping
mesh_ns = dpf.operators.mesh.from_scoping(scoping=my_mesh_scoping, mesh=model.metadata.meshed_region)
mesh_ns_out = mesh_ns.outputs.mesh.get_data()

# Temperature Field
disp = dpf.operators.result.temperature(data_sources=ds, mesh_scoping=my_mesh_scoping)
disp_f = disp.outputs.fields_container.get_data()[0]

# Plot results
plot = DpfPlotter()
plot.add_field(disp_f, meshed_region=mesh_ns_out)
plot.show_figure(show_axes=True)

Karthick RAJAN

Hello @Ayush Kumar Really Thanks for your quick response. I could surely build from here the complete script, except few things,

1. Each plot should return max and min value for each Named selection

(plot.add_field(disp_f, meshed_region=mesh_ns_out,show_max=True, show_min=True)

This doesn't plot the maximum and minimum in each plot

2. Each plot should be saved in a 3d viewable file.

(The user should be able to open the 3D interactive file whenever needed which has Max and Min value of each field along with selected Named selection scoping

Ayush Kumar

@Karthick RAJAN

1. The arguments show_max and show_min should normally do the trick, can you try it on a different model? Maybe something specific to the model is causing the issue.

2. You can save the model and results as vtk files, those can be used in post-processing tools or 3D viewers, refer to the posts below:

https://discuss.ansys.com/discussion/2124/usage-of-dpf-operator-vtk-to-fields

https://discuss.ansys.com/discussion/1998/export-results-to-vtk-format