Compute minimum and maximum of a DataFrame#

In this example, transient mechanical displacement data is used to show how to compute the min or max of a given DataFrame.

Perform required imports#

This example uses a supplied file that you can get using the examples module.

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.download_crankshaft()
# to automatically detect the simulation type, use:
simulation = post.load_simulation(example_path)

# to enable auto-completion, use the equivalent:
simulation = post.StaticMechanicalSimulation(example_path)

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


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

DPF Model
------------------------------
Static analysis
Unit system: MKS: m, kg, N, s, V, A, degC
Physics Type: Mechanical
Available results:
     -  displacement: Nodal Displacement
     -  velocity: Nodal Velocity
     -  acceleration: Nodal Acceleration
     -  reaction_force: Nodal Force
     -  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
     -  elastic_strain: ElementalNodal Strain
     -  element_euler_angles: ElementalNodal Element Euler Angles
     -  structural_temperature: ElementalNodal Structural temperature
------------------------------
DPF  Meshed Region:
  69762 nodes
  39315 elements
  Unit: m
  With solid (3D) elements
------------------------------
DPF  Time/Freq Support:
  Number of sets: 3
Cumulative     Time (s)       LoadStep       Substep
1              1.000000       1              1
2              2.000000       1              2
3              3.000000       1              3

Extract displacement data#

displacement = simulation.displacement(all_sets=True)
print(displacement)
            results       U (m)
            set_ids           1           2           3
node_ids components
    4872          X  5.6781e-06 -5.9469e-06 -3.4137e-05
                  Y  5.1667e-04  1.0318e-03  1.5417e-03
                  Z -3.2535e-06 -4.1346e-06 -2.6398e-06
    9005          X -2.6323e-06 -2.1432e-05 -5.5625e-05
                  Y  4.8445e-04  9.6717e-04  1.4448e-03
                  Z -4.9795e-07  1.2790e-06  5.3134e-06
     ...        ...         ...         ...         ...

Compute the maximum displacement for each component at each time-step#

# The default axis is the MeshIndex
maximum_over_mesh = displacement.max()
print(maximum_over_mesh)
# is equivalent to
maximum_over_mesh = displacement.max(axis="node_ids")
print(maximum_over_mesh)

# Compute the maximum displacement for each node and component across time
# ------------------------------------------------------------------------
maximum_over_time = displacement.max(axis="set_ids")
print(maximum_over_time)

# Compute the maximum displacement overall
# ----------------------------------------
maximum_overall = maximum_over_time.max()
print(maximum_overall)
   results      U (m)
   set_ids          1          2          3
components
         X 7.3303e-04 1.4495e-03 2.1441e-03
         Y 1.3962e-03 2.7884e-03 4.1656e-03
         Z 2.1567e-04 4.3321e-04 6.5135e-04


   results      U (m)
   set_ids          1          2          3
components
         X 7.3303e-04 1.4495e-03 2.1441e-03
         Y 1.3962e-03 2.7884e-03 4.1656e-03
         Z 2.1567e-04 4.3321e-04 6.5135e-04


            results       U (m)
node_ids components
    4872          X  5.6781e-06
                  Y  1.5417e-03
                  Z -2.6398e-06
    9005          X -2.6323e-06
                  Y  1.4448e-03
                  Z  5.3134e-06
     ...        ...         ...


   results      U (m)
components
         X 2.1441e-03
         Y 4.1656e-03
         Z 6.5135e-04

Compute the minimum displacement for each component at each time-step#

# The default axis is the MeshIndex
minimum_over_mesh = displacement.min()
print(minimum_over_mesh)
# is equivalent to
minimum_over_mesh = displacement.min(axis="node_ids")
print(minimum_over_mesh)

# Compute the minimum displacement for each node and component across time
# ------------------------------------------------------------------------
minimum_over_time = displacement.min(axis="set_ids")
print(minimum_over_time)

# Compute the minimum displacement overall
# ----------------------------------------
minimum_overall = minimum_over_time.min()
print(minimum_overall)
   results       U (m)
   set_ids           1           2           3
components
         X -7.4732e-04 -1.5081e-03 -2.2755e-03
         Y -4.0138e-04 -8.0316e-04 -1.2014e-03
         Z -2.1555e-04 -4.3299e-04 -6.5101e-04


   results       U (m)
   set_ids           1           2           3
components
         X -7.4732e-04 -1.5081e-03 -2.2755e-03
         Y -4.0138e-04 -8.0316e-04 -1.2014e-03
         Z -2.1555e-04 -4.3299e-04 -6.5101e-04


            results       U (m)
node_ids components
    4872          X -3.4137e-05
                  Y  5.1667e-04
                  Z -4.1346e-06
    9005          X -5.5625e-05
                  Y  4.8445e-04
                  Z -4.9795e-07
     ...        ...         ...


   results       U (m)
components
         X -2.2755e-03
         Y -1.2014e-03
         Z -6.5101e-04

Total running time of the script: (0 minutes 0.233 seconds)

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