Meshing

The meshing module allows you to use Fluent meshing capabilities from Python. Meshing workflows and meshing TUI commands are available.

Workflow example

import ansys.fluent.core as pyfluent

meshing = pyfluent.launch_fluent(mode="meshing")
meshing.transcript.start()
meshing.workflow.InitializeWorkflow(WorkflowType="Watertight Geometry")
meshing.workflow.TaskObject["Import Geometry"].Arguments = {"FileName": "cylinder.agdb"}
meshing.workflow.TaskObject["Import Geometry"].Execute()
meshing.tui.mesh.check_mesh()
exit()

You can manually convert existing Fluent meshing workflow journals to session-based PyFluent scripts. Examples follow of a Fluent journal and the equivalent PyFluent script.

Fluent journal

(%py-exec "workflow.InitializeWorkflow(WorkflowType=r'Watertight Geometry')")
(%py-exec "workflow.TaskObject['Import Geometry'].Arguments.set_state({r'FileName': r'file.pmdb',r'LengthUnit': r'in',})")
(%py-exec "workflow.TaskObject['Import Geometry'].Execute()")
(%py-exec "workflow.TaskObject['Add Local Sizing'].AddChildToTask()")
(%py-exec "workflow.TaskObject['Add Local Sizing'].Execute()")
(%py-exec "workflow.TaskObject['Generate the Surface Mesh'].Arguments.set_state({r'CFDSurfaceMeshControls': {r'MaxSize': 0.3,},})")
(%py-exec "workflow.TaskObject['Generate the Surface Mesh'].Execute()")
(%py-exec "workflow.TaskObject['Describe Geometry'].UpdateChildTasks(SetupTypeChanged=False)")
(%py-exec "workflow.TaskObject['Describe Geometry'].Arguments.set_state({r'SetupType': r'The geometry consists of only fluid regions with no voids',})")
(%py-exec "workflow.TaskObject['Describe Geometry'].UpdateChildTasks(SetupTypeChanged=True)")
(%py-exec "workflow.TaskObject['Describe Geometry'].Execute()")
(%py-exec "workflow.TaskObject['Update Boundaries'].Arguments.set_state({r'BoundaryLabelList': [r'wall-inlet'],r'BoundaryLabelTypeList': [r'wall'],r'OldBoundaryLabelList': [r'wall-inlet'],r'OldBoundaryLabelTypeList': [r'velocity-inlet'],})")
(%py-exec "workflow.TaskObject['Update Boundaries'].Execute()")
(%py-exec "workflow.TaskObject['Update Regions'].Execute()")
(%py-exec "workflow.TaskObject['Add Boundary Layers'].AddChildToTask()")
(%py-exec "workflow.TaskObject['Add Boundary Layers'].InsertCompoundChildTask()")
(%py-exec "workflow.TaskObject['smooth-transition_1'].Arguments.set_state({r'BLControlName': r'smooth-transition_1',})")
(%py-exec "workflow.TaskObject['Add Boundary Layers'].Arguments.set_state({})")
(%py-exec "workflow.TaskObject['smooth-transition_1'].Execute()")
(%py-exec "workflow.TaskObject['Generate the Volume Mesh'].Arguments.set_state({r'VolumeFill': r'poly-hexcore',r'VolumeFillControls': {r'HexMaxCellLength': 0.3,},})")
(%py-exec "workflow.TaskObject['Generate the Volume Mesh'].Execute()")

PyFluent script

meshing.workflow.InitializeWorkflow(WorkflowType="Watertight Geometry")
meshing.workflow.TaskObject["Import Geometry"].Arguments = {
    "FileName": import_filename,
    "LengthUnit": "in",
}
meshing.workflow.TaskObject["Import Geometry"].Execute()
meshing.workflow.TaskObject["Add Local Sizing"].AddChildToTask()
meshing.workflow.TaskObject["Add Local Sizing"].Execute()
meshing.workflow.TaskObject["Generate the Surface Mesh"].Arguments = {
    "CFDSurfaceMeshControls": {"MaxSize": 0.3}
}
meshing.workflow.TaskObject["Generate the Surface Mesh"].Execute()
meshing.workflow.TaskObject["Describe Geometry"].UpdateChildTasks(
    SetupTypeChanged=False
)
meshing.workflow.TaskObject["Describe Geometry"].Arguments = {
    SetupType: "The geometry consists of only fluid regions with no voids"
}
meshing.workflow.TaskObject["Describe Geometry"].UpdateChildTasks(SetupTypeChanged=True)
meshing.workflow.TaskObject["Describe Geometry"].Execute()
meshing.workflow.TaskObject["Update Boundaries"].Arguments = {
    "BoundaryLabelList": ["wall-inlet"],
    "BoundaryLabelTypeList": ["wall"],
    "OldBoundaryLabelList": ["wall-inlet"],
    "OldBoundaryLabelTypeList": ["velocity-inlet"],
}
meshing.workflow.TaskObject["Update Boundaries"].Execute()
meshing.workflow.TaskObject["Update Regions"].Execute()
meshing.workflow.TaskObject["Add Boundary Layers"].AddChildToTask()
meshing.workflow.TaskObject["Add Boundary Layers"].InsertCompoundChildTask()
meshing.workflow.TaskObject["smooth-transition_1"].Arguments = {
    "BLControlName": "smooth-transition_1",
}
meshing.workflow.TaskObject["Add Boundary Layers"].Arguments = {}
meshing.workflow.TaskObject["smooth-transition_1"].Execute()
meshing.workflow.TaskObject["Generate the Volume Mesh"].Arguments = {
    "VolumeFill": "poly-hexcore",
    "VolumeFillControls": {
        "HexMaxCellLength": 0.3,
    },
}
meshing.workflow.TaskObject["Generate the Volume Mesh"].Execute()

TUI commands example

import ansys.fluent.core as pyfluent

meshing_session = pyfluent.launch_fluent(mode="meshing")
meshing_session.tui.file.read_case("elbow.cas.gz")
solver = meshing_session.switch_to_solver()
solver.tui.define.models.unsteady_2nd_order("yes")
exit()

meshing