Get a mesh from a result file

MAPDL LSDYNA Fluent CFX

This tutorial explains how to extract a mesh from a result file.

The mesh object in DPF is a MeshedRegion. You can obtain a MeshedRegion by creating your own from scratch or by getting it from a result file.

Download tutorial as Python script Download tutorial as Jupyter notebook

Import the result file

First, import a result file. For this tutorial, you can use one available in the Examples module. For more information about how to import your own result file in DPF, see the Import Data tutorials section.

Here, we create a DataSources object so the data can be directly accessed by different PyDPF-Core APIs. This object manages paths to their files.

MAPDL

# Import the ``ansys.dpf.core`` module
from ansys.dpf import core as dpf
# Import the examples module
from ansys.dpf.core import examples
# Import the operators module
from ansys.dpf.core import operators as ops

# Define the result file path
result_file_path_1 = examples.find_static_rst()
# Create the DataSources object
ds_1 = dpf.DataSources(result_path=result_file_path_1)

LSDYNA

# Import the ``ansys.dpf.core`` module
from ansys.dpf import core as dpf
# Import the examples module
from ansys.dpf.core import examples
# Import the operators module
from ansys.dpf.core import operators as ops

# Define the result file path
result_file_path_2 = examples.download_d3plot_beam()
# Create the DataSources object
ds_2 = dpf.DataSources()
ds_2.set_result_file_path(filepath=result_file_path_2[0], key="d3plot")
ds_2.add_file_path(filepath=result_file_path_2[3], key="actunits")

Fluent

# Import the ``ansys.dpf.core`` module
from ansys.dpf import core as dpf
# Import the examples module
from ansys.dpf.core import examples
# Import the operators module
from ansys.dpf.core import operators as ops

# Define the result file path
result_file_path_3 = examples.download_fluent_axial_comp()["flprj"]
# Create the DataSources object
ds_3 = dpf.DataSources(result_path=result_file_path_3)

CFX

# Import the ``ansys.dpf.core`` module
from ansys.dpf import core as dpf
# Import the examples module
from ansys.dpf.core import examples
# Import the operators module
from ansys.dpf.core import operators as ops
# Define the result file path
result_file_path_4 = examples.download_cfx_mixing_elbow()
# Create the DataSources object
ds_4 = dpf.DataSources(result_path=result_file_path_4)

Get the mesh from the result file

You can get the mesh from a result file by two methods:

• Using the DPF Model;

• Using the mesh_provider operator.

Note

A Model extracts a large amount of information by default (results, mesh and analysis data). If using this helper takes a long time for processing the code, mind using a DataSources object and instantiating operators directly with it.

Using the DPF Model

The Model is a helper designed to give shortcuts to access the analysis results metadata and to instanciate results providers by opening a DataSources or a Streams.

Get the MeshedRegion by instantiating a Model object and accessing its metadata.

MAPDL

# Create the Model
model_1 = dpf.Model(data_sources=ds_1)
# Get the mesh
meshed_region_11 = model_1.metadata.meshed_region

LSDYNA

# Create the Model
model_2 = dpf.Model(data_sources=ds_2)
# Get the mesh
meshed_region_21 = model_2.metadata.meshed_region

Fluent

# Create the Model
model_3 = dpf.Model(data_sources=ds_3)
# Get the mesh
meshed_region_31 = model_3.metadata.meshed_region

CFX

# Create the Model
model_4 = dpf.Model(data_sources=ds_4)
# Get the mesh
meshed_region_41 = model_4.metadata.meshed_region

Printing the MeshedRegion displays the mesh dimensions:

• Number of nodes and elements

• Unit

• Elements type

MAPDL

# Print the MeshedRegion
print(meshed_region_11)

DPF  Meshed Region: 
  81 nodes 
  8 elements 
  Unit: m 
  With solid (3D) elements

LSDYNA

# Print the MeshedRegion
print(meshed_region_21)

DPF  Meshed Region: 
  1940 nodes 
  2056 elements 
  Unit: mm 
  With solid (3D) elements, beam (1D) elements

Fluent

# Print the MeshedRegion
print(meshed_region_31)

DPF  Meshed Region: 
  16660 nodes 
  13856 elements 
  44242 faces 
  Unit: m 
  With solid (3D) elements

CFX

# Print the MeshedRegion
print(meshed_region_41)

DPF  Meshed Region: 
  6219 nodes 
  15695 elements 
  Unit: m 
  With solid (3D) elements

Using the mesh_provider operator

Get the MeshedRegion by instantiating the mesh_provider operator with the DataSources object as an argument.

MAPDL

# Get the mesh with the mesh_provider operator
meshed_region_12 = ops.mesh.mesh_provider(data_sources=ds_1).eval()

LSDYNA

# Get the mesh with the mesh_provider operator
meshed_region_22 = ops.mesh.mesh_provider(data_sources=ds_2).eval()

Fluent

# Get the mesh with the mesh_provider operator
meshed_region_32 = ops.mesh.mesh_provider(data_sources=ds_3).eval()

CFX

# Get the mesh with the mesh_provider operator
meshed_region_42 = ops.mesh.mesh_provider(data_sources=ds_4).eval()

Printing the MeshedRegion displays the mesh dimensions:

• Number of nodes and elements

• Unit

• Elements type

MAPDL

# Print the MeshedRegion
print(meshed_region_12)

DPF  Meshed Region: 
  81 nodes 
  8 elements 
  Unit: m 
  With solid (3D) elements

LSDYNA

# Print the MeshedRegion
print(meshed_region_22)

DPF  Meshed Region: 
  1940 nodes 
  2056 elements 
  Unit: mm 
  With solid (3D) elements, beam (1D) elements

Fluent

# Print the MeshedRegion
print(meshed_region_32)

DPF  Meshed Region: 
  16660 nodes 
  13856 elements 
  44242 faces 
  Unit: m 
  With solid (3D) elements

CFX

# Print the MeshedRegion
print(meshed_region_42)

DPF  Meshed Region: 
  6219 nodes 
  15695 elements 
  Unit: m 
  With solid (3D) elements