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Bug located in PyMAPDL plotting #232

@jgd10

Description

@jgd10

Before submitting the issue

  • I have visited the Troubleshooting section.
  • I have searched among the existing issues.
  • I am using a Python virtual environment.
  • I have a fully updated virtual environment (i.e. pip install --upgrade --upgrade-strategy eager ansys-mapdl-core)

Description of the bug

PyMAPDL plots asymmetric data for a simple symmetric problem using BEAM188 elements.

Steps To Reproduce

from ansys.mapdl.core import launch_mapdl
from ansys.mapdl.reader.rst import Result


# start mapdl and clear it
mapdl = launch_mapdl()
mapdl.clear() # optional as MAPDL just started
mapdl.units("SI") # SI - International system (m, kg, s, K).
mapdl.prep7()

mapdl.antype("STATIC")
mapdl.et(1, "BEAM188")
mapdl.sectype(1, "BEAM", "RECT")
mapdl.secdata(0.01, 0.01)


mapdl.mp("EX", 1, 10.e9)
mapdl.mp("PRXY", 0.33)

nodes = [mapdl.n(1, 0, 0, 0), mapdl.n(2, 0.1, 0, 0), mapdl.n(3, 0.2, 0, 0),
         mapdl.n(4, 0.3, 0, 0), mapdl.n(5, 0.4, 0, 0), mapdl.n(6, 0.5, 0, 0),
         mapdl.n(7, 0.6, 0, 0), mapdl.n(8, 0.7, 0, 0), mapdl.n(9, 0.8, 0, 0),
         mapdl.n(10, 0.9, 0, 0), mapdl.n(11, 1.0, 0, 0),
         mapdl.n(12, 0, -0.1, 0), mapdl.n(13, 1.0, -0.1, 0)]


elements = [mapdl.e(1, 2), mapdl.e(2, 3), mapdl.e(3, 4), mapdl.e(4, 5),
            mapdl.e(5, 6), mapdl.e(6, 7), mapdl.e(7, 8), mapdl.e(8, 9),
            mapdl.e(9, 10), mapdl.e(10, 11), mapdl.e(12, 2), mapdl.e(13, 10)]


# constrain nodes at fixed end
mapdl.nsel("ALL")
for n in [1, 12, 11, 13]:
    mapdl.d(n, "ALL") 
    mapdl.f(5, "FY", -20)
    mapdl.f(6, "FY", -20)
    mapdl.f(7, "FY", -20)

mapdl.finish()

mapdl.run("/SOLU")
mapdl.solve()
mapdl.finish()
mapdl.post1()

simulation_result = mapdl.result # type: Result

simulation_result.plot_principal_nodal_stress(
    0,
    "SEQV",
    show_edges=True,
    cmap="viridis",
    cpos="xy",
    render_lines_as_tubes=True,
    line_width=20.
)

mapdl.finish()
mapdl.exit() 

Which Operating System are you using?

Windows

Which Python version are you using?

3.10

PyMAPDL Report

Show the Report!

-------------------------------------------------------------------------------


PyMAPDL Software and Environment Report


Packages Requirements
*********************

Core packages
-------------
ansys.mapdl.core    : 0.64.0
numpy               : 1.24.2
appdirs             : 1.4.4
scipy               : 1.10.1
grpc                : Package not found
ansys.api.mapdl.v0  : Package not found
ansys.mapdl.reader  : 0.52.11
google.protobuf     : Package not found

Optional packages
-----------------
matplotlib          : 3.7.1
pyvista             : 0.38.4
pyiges              : 0.2.1
tqdm                : 4.65.0


Ansys Installation
******************
Version   Location
------------------
222       C:\Program Files\ANSYS Inc\v222


Ansys Environment Variables
***************************
AWP_ROOT222                    C:\Program Files\ANSYS Inc\v222
ANSYS222_DIR                   C:\Program Files\ANSYS Inc\v222\ANSYS
CADOE_LIBDIR222                C:\Program Files\ANSYS Inc\v222\CommonFiles\Language\en-us
ANSYSLIC_DIR                   C:\Program Files\ANSYS Inc\Shared Files\Licensing


Installed packages

Show the installed packages!

ansys-api-mapdl==0.5.1
ansys-api-platform-instancemanagement==1.0.0b3
ansys-mapdl-core==0.64.0
ansys-mapdl-reader==0.52.11
ansys-platform-instancemanagement==1.0.3
appdirs==1.4.4
certifi==2022.12.7
charset-normalizer==3.1.0
click==8.1.3
colorama==0.4.6
contourpy==1.0.7
cycler==0.11.0
fonttools==4.39.0
geomdl==5.3.1
googleapis-common-protos==1.58.0
grpcio==1.51.3
idna==3.4
imageio==2.26.0
importlib-metadata==6.0.0
kiwisolver==1.4.4
matplotlib==3.7.1
numpy==1.24.2
packaging==23.0
Pillow==9.4.0
platformdirs==3.1.1
pooch==1.7.0
protobuf==3.20.3
protoc-gen-swagger==0.1.0
pyansys-tools-versioning==0.3.3
pyiges==0.2.1
pyparsing==3.0.9
python-dateutil==2.8.2
pyvista==0.38.4
requests==2.28.2
scipy==1.10.1
scooby==0.7.1
six==1.16.0
tqdm==4.65.0
urllib3==1.26.15
vtk==9.2.6
zipp==3.15.0

Logger output file

Show the logger output file.

# PASTE HERE THE CONTENT OF THE LOGGER OUTPUT FILE.

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