Fluid Simulation Result Extraction#

This example shows how to load a fluid simulation (here a heating coil simulated with CFX), explore the metadata available, and use the result extraction capabilities.

Note

This example requires DPF 7.0 (2024.1.pre0) or above. For more information, see Compatibility.

Perform required imports#

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

Load the fluid analysis result#

fluid_example_files = examples.download_cfx_heating_coil()
simulation = post.FluidSimulation(
    cas=fluid_example_files["cas"], dat=fluid_example_files["dat"]
)
# Printing the simulation will show most of the available metadata
print(simulation)
Fluid Simulation.


Data Sources
------------------------------
DPF  DataSources:
  Result files:
     result key: cas and path: /opt/hostedtoolcache/Python/3.10.14/x64/lib/python3.10/site-packages/ansys/dpf/core/examples/result_files/cfx-heating_coil/def.cas.cff
  Secondary files:
     path: /opt/hostedtoolcache/Python/3.10.14/x64/lib/python3.10/site-packages/ansys/dpf/core/examples/result_files/cfx-heating_coil/def.dat.cff


DPF Model
------------------------------
Static analysis
Unit system: SI: m, kg, N, s, V, A, K
Physics Type: Fluid
Available results:
     -  specific_heat: Nodal Specific Heat
     -  epsilon: Nodal Epsilon
     -  enthalpy: Nodal Enthalpy
     -  turbulent_kinetic_energy: Nodal Turbulent Kinetic Energy
     -  thermal_conductivity: Nodal Thermal Conductivity
     -  dynamic_viscosity: Nodal Dynamic Viscosity
     -  turbulent_viscosity: Nodal Turbulent Viscosity
     -  static_pressure: Nodal Static Pressure
     -  total_pressure: Nodal Total Pressure
     -  density: Nodal Density
     -  entropy: Nodal Entropy
     -  temperature: Nodal Temperature
     -  total_temperature: Nodal Total Temperature
     -  velocity: Nodal Velocity
Available qualifier labels:
     - phase: <Mixture> (1), Water at 25 C (2), Copper (3)
     - zone: outflow (9), Default (10), inflow (11), Solid 2.8 1 (12), Solid 2.7 1 (13), Solid 2.6 1 (14), Solid 2.5 1 (15), Solid 2.4 1 (16), Solid 2.3 1 (17), Default 1 (1), Default (18), Solid 2.3 (19), Solid 2.4 (20), Solid 2.5 (21), Solid 2.6 (22), Solid 2.7 (23), Solid 2.8 (24), heater (2)
------------------------------
DPF  Meshed Region:
  25456 nodes
  74882 elements
  Unit: m
  With solid (3D) elements
------------------------------
DPF  Time/Freq Support:
  Number of sets: 1
Cumulative     Frequency ()   LoadStep       Substep
1              0.000000       1              1

Explore the available metadata#

Check the available cell and face zones

print(simulation.cell_zones)
print(simulation.face_zones)
{1: 'Default 1', 2: 'heater'}
{9: 'outflow', 10: 'Default', 11: 'inflow', 12: 'Solid 2.8 1', 13: 'Solid 2.7 1', 14: 'Solid 2.6 1', 15: 'Solid 2.5 1', 16: 'Solid 2.4 1', 17: 'Solid 2.3 1', 18: 'Default', 19: 'Solid 2.3', 20: 'Solid 2.4', 21: 'Solid 2.5', 22: 'Solid 2.6', 23: 'Solid 2.7', 24: 'Solid 2.8'}

The mesh metadata is available separately from the mesh as accessing the mesh means loading it. Use the mesh_info property to explore the mesh structure to define queries

print(simulation.mesh_info)
Fluid mesh metadata
-------------------
Number of nodes: 25456
Number of faces: 11780
Number of cells: 74882
Cell zones:
        {1: 'Default 1', 2: 'heater'}
Face zones:
        {9: 'outflow', 10: 'Default', 11: 'inflow', 12: 'Solid 2.8 1', 13: 'Solid 2.7 1', 14: 'Solid 2.6 1', 15: 'Solid 2.5 1', 16: 'Solid 2.4 1', 17: 'Solid 2.3 1', 18: 'Default', 19: 'Solid 2.3', 20: 'Solid 2.4', 21: 'Solid 2.5', 22: 'Solid 2.6', 23: 'Solid 2.7', 24: 'Solid 2.8'}
Cell to face zones:
        {1: [9, 10, 11, 12, 13, 14, 15, 16, 17], 2: [18, 19, 20, 21, 22, 23, 24]}

Check the available species

print(simulation.species)
0 species available
{}

Check the available phases

print(simulation.phases)
3 phases available
{Phase<name: '<Mixture>', id=1>, Phase<name: 'Water at 25 C', id=2>, Phase<name: 'Copper', id=3>, }
Extract a result
print(simulation.result_info)
Static analysis
Unit system: SI: m, kg, N, s, V, A, K
Physics Type: Fluid
Available results:
     -  specific_heat: Nodal Specific Heat
     -  epsilon: Nodal Epsilon
     -  enthalpy: Nodal Enthalpy
     -  turbulent_kinetic_energy: Nodal Turbulent Kinetic Energy
     -  thermal_conductivity: Nodal Thermal Conductivity
     -  dynamic_viscosity: Nodal Dynamic Viscosity
     -  turbulent_viscosity: Nodal Turbulent Viscosity
     -  static_pressure: Nodal Static Pressure
     -  total_pressure: Nodal Total Pressure
     -  density: Nodal Density
     -  entropy: Nodal Entropy
     -  temperature: Nodal Temperature
     -  total_temperature: Nodal Total Temperature
     -  velocity: Nodal Velocity
Available qualifier labels:
     - phase: <Mixture> (1), Water at 25 C (2), Copper (3)
     - zone: outflow (9), Default (10), inflow (11), Solid 2.8 1 (12), Solid 2.7 1 (13), Solid 2.6 1 (14), Solid 2.5 1 (15), Solid 2.4 1 (16), Solid 2.3 1 (17), Default 1 (1), Default (18), Solid 2.3 (19), Solid 2.4 (20), Solid 2.5 (21), Solid 2.6 (22), Solid 2.7 (23), Solid 2.8 (24), heater (2)

Print information about a specific available result

print(simulation.result_info["temperature"])
# Or use an index
# print(simulation.result_info[12])
DPF Result
----------
temperature
Operator name: "TEMP"
Number of components: 1
Dimensionality: scalar
Homogeneity: temperature
Units: K
Location: Nodal
Available qualifier labels:
  - zone: Default 1 (1), outflow (9), Default (10), inflow (11), Solid 2.8 1 (12), Solid 2.7 1 (13), Solid 2.6 1 (14), Solid 2.5 1 (15), Solid 2.4 1 (16), Solid 2.3 1 (17), heater (2), Default (18), Solid 2.3 (19), Solid 2.4 (20), Solid 2.5 (21), Solid 2.6 (22), Solid 2.7 (23), Solid 2.8 (24)
  - phase: Water at 25 C (2), Copper (3)
Available qualifier combinations:
  {'zone': 1, 'phase': 2}
  {'zone': 9, 'phase': 2}
  {'zone': 10, 'phase': 2}
  {'zone': 11, 'phase': 2}
  {'zone': 12, 'phase': 2}
  {'zone': 13, 'phase': 2}
  {'zone': 14, 'phase': 2}
  {'zone': 15, 'phase': 2}
  {'zone': 16, 'phase': 2}
  {'zone': 17, 'phase': 2}
  {'zone': 2, 'phase': 3}
  {'zone': 18, 'phase': 3}
  {'zone': 19, 'phase': 3}
  {'zone': 20, 'phase': 3}
  {'zone': 21, 'phase': 3}
  {'zone': 22, 'phase': 3}
  {'zone': 23, 'phase': 3}
  {'zone': 24, 'phase': 3}

Extract the temperature data#

temperature = simulation.temperature()
print(temperature)

# # The dataframe obtained shows data for two different phases
 results          TEMP (K)
 set_ids                 1
   phase Water at 25 C (2) Copper (3)
node_ids
       1        3.0533e+02
       2        3.0389e+02
       3        3.0155e+02
       4        3.0201e+02
       5        3.0340e+02
       6        3.0487e+02
     ...               ...        ...

Select data for phase 2 only (Water)

print(temperature.select(phase=[2]))
 results          TEMP (K)
 set_ids                 1
   phase Water at 25 C (2)
node_ids
       1        3.0533e+02
       2        3.0389e+02
       3        3.0155e+02
       4        3.0201e+02
       5        3.0340e+02
       6        3.0487e+02
     ...               ...

To directly extract the temperature data for a given phase, pass the ‘temperature’ method a ‘phases’ argument. This argument must be given a list of phase unique identifiers, which appear in the dataframe in the phase label column between parentheses, or as listed under the ‘Available qualifier labels’ section of the metadata on the result You can also directly use the phase name.

water_temperature = simulation.temperature(phases=["Water at 25 C"])
# equivalent to
# water_temperature = simulation.temperature(phases=[2])
print(water_temperature)
# # The dataframe obtained now only stores data for the water phase.
 results          TEMP (K)                                                                        ...
 set_ids                 1                                                                        ...
   phase Water at 25 C (2)                                                                        ...
    zone     Default 1 (1) outflow (9) Default (10) inflow (11) Solid 2.8 1 (12) Solid 2.7 1 (13) ...
node_ids                                                                                          ...
       1        3.0533e+02               3.0533e+02                                               ...
       2        3.0389e+02               3.0389e+02                                               ...
       3        3.0155e+02               3.0155e+02                                               ...
       4        3.0201e+02               3.0201e+02                                               ...
       5        3.0340e+02               3.0340e+02                                               ...
       6        3.0487e+02               3.0487e+02                                               ...
     ...               ...         ...          ...         ...              ...              ... ...

To extract a result on given zones use the ‘zone_ids’ argument or the ‘qualifiers’ dictionary argument with key ‘zone’ Here we request and plot the temperature on all face zones

face_temperature = simulation.temperature(zone_ids=list(simulation.face_zones.keys()))
face_temperature.plot()
00 explore fluid simulation

Total running time of the script: (0 minutes 3.046 seconds)

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