Usage of DPF operator vtk to fields

kanchan_cadfem

Hi all,

I am using pyDPF

I am trying to get the data from a VTK file, and combine it with results of RST file.

I found the operator "vtk_to_fields"

unfofortinately I could not figure out how to use this operator.

I have already looked at the example as well as the tests in github but did not find anything useful.

could you please help me to understand, how to create a data source for a VTK file and give it to this operator

PS: RST and VTK files have different meshes

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Comments

Rajesh Meena

@kanchan_cadfem

You might have faced the challenge because field_name pin is mentioned optional but it is a compulsory pin.

You can get the field name from the vtk file by opening it in text pad.

If the vtk file is big and you do not want to open in text pad then you can use pyvista APIs to get the field names.

import pyvista
mesh = pyvista.read('D:/vtk_file.vtk')
fields_available = mesh.array_names #Return field_name lists ( including node_ids and elements_ids)

Once you know the field_name then you can use below script. Below script include export and reimport of the vtk file data.

Hope it helps.

from ansys.dpf import core as dpf
from ansys.dpf.core import examples

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

results = model.results
displacements = results.displacement()
fields = displacements.outputs.fields_container()

field = fields[0]
field.plot()

vtk_op = dpf.operators.serialization.vtk_export(
    export_type=0,
    file_path="D:/vtk_file.vtk",
    fields1=fields,
    mesh=field.meshed_region
)
vtk_op.run()

vtk_datasource = dpf.DataSources(result_path="D:/vtk_file.vtk")
vkt_field_op = dpf.operators.serialization.vtk_to_fields(
    field_name="2_displacement_1.s_(m)",
    data_sources=vtk_datasource,
    server=model.metadata._server
)
result_fields_container = vkt_field_op.eval()
result_fields_container[0].plot()