Define boundary conditions

PyFluent supports using Solver TUI commands and Solver settings objects to define boundary conditions.

Use solver TUI commands

The examples in this section show how you use Solver TUI commands to define boundary conditions.

Define boundary conditions

This example shows a comparison between the TUI command and the Python code for defining velocity boundary conditions at inlets.

TUI command

/define/boundary-counditions/set/velocity-inlet cold-inlet () vmag no 0.4 quit
/define/boundary-counditions/set/velocity-inlet cold-inlet () ke-spec no no no yes quit
/define/boundary-counditions/set/velocity-inlet cold-inlet() cold-inlet () turb-intensity 5 quit
/define/boundary-counditions/set/velocity-inlet cold-inlet () cold-inlet () turb-hydraulic-diam 4 quit
/define/boundary-counditions/set/velocity-inlet cold-inlet () cold-inlet () temperature no 293.15 quit

Python code

import ansys.fluent.core as pyfluent

solver = pyfluent.launch_fluent(precision="double", processor_count=2, mode="solver")
solver.tui.file.read_case("file.cas.h5")
solver.tui.define.boundary_conditions.set.velocity_inlet(
    "cold-inlet", (), "vmag", "no", 0.4, "quit"
)
solver.tui.define.boundary_conditions.set.velocity_inlet(
    "cold-inlet", (), "ke-spec", "no", "no", "no", "yes", "quit"
)
solver.tui.define.boundary_conditions.set.velocity_inlet(
    "cold-inlet", (), "turb-intensity", 5, "quit"
)
solver.tui.define.boundary_conditions.set.velocity_inlet(
    "cold-inlet", (), "turb-hydraulic-diam", 4, "quit"
)
solver.tui.define.boundary_conditions.set.velocity_inlet(
    "cold-inlet", (), "temperature", "no", 293.15, "quit"
)

Copy boundary conditions

This example shows a comparison between the TUI command and the Python code for copying boundary conditions to other zones.

TUI command

/define/boundary-conditions/copy-bc cold-inlet hot-inlet ()

Python code

solver.tui.define.boundary_conditions.copy_bc('cold-inlet','hot-inlet','()')

List zones

This example shows a comparison between the TUI command and the Python code for printing to the Fluent console the types and IDs of all zones.

TUI command

/define/boundary-conditions/list-zones

Python code

solver.tui.define.boundary_conditions.list_zones()

Modify cell zone conditions

This example shows a comparison between the TUI command and the Python code for modifying cell zone conditions.

TUI command

/define/boundary-conditions/fluid elbow-fluid no no no no no 0 no 0 no 0 no 0 no 0 no 1 no yes yes no no no

Python code

# Enabling Laminar Zone
solver.tui.define.boundary_conditions.fluid(
    "elbow-fluid",
    "no",
    "no",
    "no",
    "no",
    "no",
    0,
    "no",
    0,
    "no",
    0,
    "no",
    0,
    "no",
    0,
    "no",
    1,
    "no",
    "yes",
    "yes",
    "no",
    "no",
    "no",
)

Use settings objects

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

Define boundary conditions

Python code

solver.setup.boundary_conditions.velocity_inlet["cold-inlet"].vmag = {
    "option": "constant or expression",
    "constant": 0.4,
}
solver.setup.boundary_conditions.velocity_inlet[
    "cold-inlet"
].ke_spec = "Intensity and Hydraulic Diameter"
solver.setup.boundary_conditions.velocity_inlet["cold-inlet"].turb_intensity = 5
solver.setup.boundary_conditions.velocity_inlet[
    "cold-inlet"
].turb_hydraulic_diam = "4 [in]"
solver.setup.boundary_conditions.velocity_inlet["cold-inlet"].t = {
    "option": "constant or expression",
    "constant": 293.15,
}

Modify cell zone conditions

Python code

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