Extract cyclic results#

In this script, a modal analysis with cyclic symmetry is processed to show how to expand the mesh and results.

Perform required imports#

This example uses a supplied file that you can get by importing the DPF examples package.

from ansys.dpf import post
from ansys.dpf.post import examples

Get Simulation object#

Get the Simulation object that allows access to the result. The Simulation object must be instantiated with the path for the result file. For example, "C:/Users/user/my_result.rst" on Windows or "/home/user/my_result.rst" on Linux.

example_path = examples.find_simple_cyclic()
simulation = post.ModalMechanicalSimulation(example_path)

# print the simulation to get an overview of what's available
print(simulation)
Modal Mechanical Simulation.


Data Sources
------------------------------
/opt/hostedtoolcache/Python/3.10.14/x64/lib/python3.10/site-packages/ansys/dpf/core/examples/result_files/file_cyclic.rst

DPF Model
------------------------------
Modal analysis
Unit system: MKS: m, kg, N, s, V, A, degC
Physics Type: Mechanical
Available results:
     -  displacement: Nodal Displacement
     -  stress: ElementalNodal Stress
     -  elemental_volume: Elemental Volume
     -  stiffness_matrix_energy: Elemental Energy-stiffness matrix
     -  artificial_hourglass_energy: Elemental Hourglass Energy
     -  thermal_dissipation_energy: Elemental thermal dissipation energy
     -  kinetic_energy: Elemental Kinetic Energy
     -  co_energy: Elemental co-energy
     -  incremental_energy: Elemental incremental energy
     -  element_euler_angles: ElementalNodal Element Euler Angles
     -  structural_temperature: ElementalNodal Structural temperature
------------------------------
DPF  Meshed Region:
  51 nodes
  4 elements
  Unit: m
  With solid (3D) elements
------------------------------
DPF  Time/Freq Support:
  Number of sets: 30
Cumulative     Frequency (Hz) LoadStep       Substep        Harmonic index
1              670386.325235  1              1              0.000000
2              872361.424038  1              2              0.000000
3              1142526.525324 1              3              0.000000
4              1252446.741551 1              4              0.000000
5              1257379.552140 1              5              0.000000
6              1347919.358013 1              6              0.000000
7              679667.393214  2              1              1.000000
8              679667.393214  2              2              -1.000000
9              899321.218481  2              3              -1.000000
10             899321.218481  2              4              1.000000
11             1128387.049511 2              5              1.000000
12             1128387.049511 2              6              -1.000000
13             708505.071361  3              1              -2.000000
14             708505.071361  3              2              2.000000
15             966346.820117  3              3              2.000000
16             966346.820117  3              4              -2.000000
17             1031249.070606 3              5              -2.000000
18             1031249.070606 3              6              2.000000
19             757366.624982  4              1              -3.000000
20             757366.624982  4              2              3.000000
21             926631.623058  4              3              -3.000000
22             926631.623058  4              4              3.000000
23             1035144.649248 4              5              3.000000
24             1035144.649248 4              6              -3.000000
25             807882.379030  5              1              4.000000
26             856868.410638  5              2              4.000000
27             1063247.283632 5              3              4.000000
28             1185511.741334 5              4              4.000000
29             1278969.844256 5              5              4.000000
30             1355579.879820 5              6              4.000000

Extract expanded displacement norm#

displacement_norm = simulation.displacement(
    norm=True,
    expand_cyclic=True,
)
print(displacement_norm)
displacement_norm.plot()
01 cyclic results
 results    U_N (m)
 set_ids          1
node_ids
       1 8.5207e+01
      52 8.5207e+01
     103 8.5207e+01
     154 8.5207e+01
     205 8.5207e+01
     256 8.5207e+01
     ...        ...

Extract equivalent von Mises nodal stress expanded on the first four sectors#

stress_vm_sectors_1_2_3_4 = simulation.stress_eqv_von_mises_nodal(
    expand_cyclic=[1, 2, 3, 4],
)
print(stress_vm_sectors_1_2_3_4)
stress_vm_sectors_1_2_3_4.plot()
01 cyclic results
 results  S_VM (Pa)
 set_ids          1
node_ids
       1 7.6536e+15
      14 9.2247e+15
      15 4.6219e+15
      18 6.4123e+15
       2 1.4681e+16
       6 7.9359e+15
     ...        ...

Extract equivalent von Mises nodal stress without expansion#

stress_vm_sector_1 = simulation.stress_eqv_von_mises_nodal(
    expand_cyclic=False,
)
print(stress_vm_sector_1)
stress_vm_sector_1.plot()
01 cyclic results
    results  S_VM (Pa)
    set_ids          1
base_sector          1
   node_ids
          1 2.1648e+16
         14 2.6092e+16
         15 1.3073e+16
         18 1.8137e+16
          2 4.1523e+16
          6 2.2446e+16
        ...        ...

Total running time of the script: (0 minutes 1.872 seconds)

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