CFD Online Discussion Forums - [ANSYS Meshing] Automatic Script for Named Selections of a Volute

Hello,

I'm trying to write a python script for ANSYS Meshing.
For now, the ANSYS Scripting guide for Mechanical does only help to a certain point.

What I try to achieve:
I want to automate the naming of faces of a volute. These are: Outlet, Interface, Symmetry and Walls.

I wrote the script to name the Outlet, Interface and Symmetry Face based on the face areas. For the symmetry, since it is the biggest plane, I used the function:

Code:

SelectionOperatorType.Largest

That works fine.

All other faces, that are not selected yet, shall be placed in a selection called Walls.

I tried it with putting every face into Walls first, using a face area > 0.0 mm. And then start the naming of the other faces. But, the other faces are sadly not excluded of the Walls selection afterwards.

Is there a good option about using connections? Or any other method?

Attached an image of an exemplary volute and the named selection up until now and the code. Also, I assume there must a better way to code my named selections.

Code:

sel = Model.AddNamedSelection()

sel.ScopingMethod=GeometryDefineByType.Worksheet



b3 = 0.3

D3 = 0.73

Dd = 0.8



bool_symmetry = True



if bool_symmetry == True:

    A_interface = 0.5*(pi * D3 * b3) 

    A_discharge = 0.5*(pi/4 * Dd**2)

    



# DISCHARGE

sel.Name = "VOLUTE_OUTLET"

discharge = sel.GenerationCriteria

discharge.Add(None)

discharge[0].EntityType=SelectionType.GeoFace

discharge[0].Criterion=SelectionCriterionType.Size

discharge[0].Operator=SelectionOperatorType.RangeInclude

discharge[0].UpperBound = Quantity(A_discharge*1.01 ,"m m")

discharge[0].LowerBound = Quantity(A_discharge*0.99, "m m")

sel.Generate()





# SYMMTERY

sel_sym = Model.AddNamedSelection()

sel_sym.ScopingMethod=GeometryDefineByType.Worksheet



sel_sym.Name = "VOLUTE_SYMMETRY"

symmetry = sel_sym.GenerationCriteria

symmetry.Add(None)

symmetry[0].EntityType=SelectionType.GeoFace

symmetry[0].Criterion=SelectionCriterionType.Size

symmetry[0].Operator=SelectionOperatorType.Largest



sel_sym.Generate()





# INTERFACE

sel_itf = Model.AddNamedSelection()

sel_itf.ScopingMethod=GeometryDefineByType.Worksheet



sel_itf.Name = "VOLUTE_INTERFACE"

interface = sel_itf.GenerationCriteria

interface.Add(None)

interface[0].EntityType=SelectionType.GeoFace

interface[0].Criterion=SelectionCriterionType.Size

# I use RangeInclude, because the Equal command does not find the face (maybe rounding error?)

interface[0].Operator=SelectionOperatorType.RangeInclude

interface[0].UpperBound = Quantity(A_interface*1.01 ,"m m")

interface[0].LowerBound = Quantity(A_interface*0.99, "m m")

sel_itf.Generate()

Maybe you have better resources of ANSYS that I haven't found yet?
Thank you for your help.

Daniel