Create a shell cylinder with PyAnsys

SchluppIng

Hello everyone,

I would like to generate a cylinder as a shell from a line that I create with the PyAnsys Modeler. In SpaceClaim and Discovery this is easy using the selection and pull function to then rotate the line with the RevolveEdge function in the IronPython API Script Editor. Is this also possible in PyAnsys? I think it is possible, but I haven't found the solution yet. Because when I use the function component.revolve(), I get an error.

standardUnit = unit.mm

sketch = Sketch()
start_point = Point2D([xMid_bottom, yMid_bottom], unit=standardUnit)
end_point = Point2D([xMid_top, yMid_top], unit=standardUnit)
sketch.segment(start_point, end_point, "Midline")

component = design.add_component(name="what ever")
component.revolve_sketch(name=shell.label, sketch=sketch, axis=UNITVECTOR3D_Y, angle=Angle(360, unit=unit.degrees), rotation_origin=Point3D([0, 0, 0]))

RobPasMue

Hi @SchluppIng -- I think something like this is what you are looking for

import numpy as np

from ansys.geometry.core import launch_modeler
from ansys.geometry.core.math.constants import UNITVECTOR3D_Z
from ansys.geometry.core.shapes.curves.circle import Circle
from ansys.geometry.core.shapes.curves.line import Line
from ansys.geometry.core.shapes.parameterization import Interval

modeler = launch_modeler()

# Create a design
design = modeler.create_design(name="MyDesign")

# Create your start and end point for your line
line_point = [10, 0, 0]

# Create the profile (cylinder's vertical line representing the outside of the cylinder)
profile = [
    Line(line_point, UNITVECTOR3D_Z).trim(Interval(0, 10)),
]

# Create path for sweeping the profile (radius is defined randomly in this case, since
# the profile is a line, it will be swept along the line)
path = [Circle(origin=[0, 0, 0], radius=5).trim(Interval(0, 2 * np.pi))]

# Create the sweep
sweep = design.sweep_chain(
    name="MySweep",
    path=path,
    chain=profile,
)

# Plot the sweep
design.plot()

Currently, the revolve_sketch only accepts closed sketches. We will work to try and accept open sketches (and thus allowing you to define shelled bodies) in the future. Hope this serves

RobPasMue

Have a look at https://geometry.docs.pyansys.com/version/stable/examples/03_modeling/sweep_chain_profile.html# for more examples related to sweeping chains (open sketches) and sketches (closed sketches)

SchluppIng

Hi @RobPasMue,

thanks for the quick answer. In general it works fine, but the line is just a straight line. How do a create an inclined line with a start and end point?

SchluppIng

Hi @RobPasMue,

thanks for the quick answer. Short question regarding the Line.

RobPasMue

Hi @SchluppIng -- sorry for the late response!

You could define a vector that represents your line's direction (not aligned along X, Y ,Z axis) and then trim from your starting point to your end point. Something like:

unit_vec= UnitVector3D([1, 1, 1])
x0 = Point3D([2, 3, 4])
profile = [
    Line(x0, unit_vec).trim(Interval(0, 10)),
]

This line would have an origin/start point at x0 and you would trim it for 10 length units. And its direction is defined by unit_vec.

I hope this helps!