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PyFluent Cheat Sheet

Ansys Developer | 07.18.2023

This is a quick-reference guide for PyFluent. You can jump to a section of your choosing by using these links:

Launching Fluent | Import Mesh in Launched Session | Enable Heat Transfer Physics | Accessing the Object State Using pprint | Define materials | Define Boundary Conditions | Modify Cell Zone Conditions | Apply Solution Settings |


Launching Fluent Locally

The following method is used to start Fluent from Python in gRPC mode. This code starts Fluent in the background so that commands can be sent to Fluent from the Python interpreter.

import ansys.fluent.core as pyfluent 
solver=pyfluent.launch_fluent(mode="solver", show_gui=True) 

The solver object contains attributes such as file, setup, solution, and results, which are also instances of settings objects.


Import Mesh in Launched Session

The following examples show how to read the available mesh file in Fluent Session.

import_filename='example_file.msh.h5'"case", file_name= import_filename) 

There are other specific Client Libraries available for reading case files and reading case-datafiles.

# e.g., read_case(), read_case_data() 

import_filename = 'example_file.cas.h5' 
solver.file.read_case(file_type="case", file_name=import_filename)


Enable heat transfer physics

The following examples show how to enable heat transfer by activating the energy equation. = True


Accessing the Object State Using pprint

>>> from pprint import pprint
>>> pprint(
    'inlet_diffusion': True,
    'kinetic_energy': False,
    'pressure_work': False,
    'viscous_dissipation': False}


Define materials

This example shows how to use solver settings objects to define materials.

solver.setup.materials.copy_database_material_by_name(type="fluid", name="water-liquid")
solver.setup.cell_zone_conditions.fluid["elbow-fluid" ].material = "water-liquid" 


Define Boundary Conditions

The examples in this section show how you use solver settings objects to define boundary conditions.

solver.setup.boundary_conditions.velocity_inlet["coldinlet"].vmag = {
    "option": "constantorexpression",
    "constant": 0.4,

solver.setup.boundary_conditions.velocity_inlet["cold-inlet"].ke_spec = "IntensityandHydraulicDiameter" 
solver.setup.boundary_conditions.velocity_inlet["coldinlet"].turb_intensity = 5 
solver.setup.boundary_conditions.velocity_inlet[ "cold-inlet" ].turb_hydraulic_diam = "4[in]" 
solver.setup.boundary_conditions.velocity_inlet["coldinlet"].t = { "option": "constantorexpression", "constant": 293.15} 


Modify Cell Zone Conditions

The examples in this section show how you use solver settings objects to modify cell zone conditions.

# Enabling Laminar Zone 

solver.setup.cell_zone_conditions.fluid["elbow-fluid"] = {"laminar": True} 


Apply Solution Settings

PyFluent allows you to use solver settings objects to apply solution settings, initialize, and solve.




PyFluent allows you to post-process data with the results object. The following example shows you how to create and display contours on a plane.["contour"] = {}["contour"].print_state()["contour"].field = " temperature"["contour"]. surfaces_list = [ "symmetry-xyplane"] 


Temperature Contour

Temperature Countour


References from PyAnsys Documentation