APTN command not consistent with the same BTOL settings

[sjorskremer]

Hi,

I am performing various mapdl.aptn() operations to cut away a profile in an area. (see an example in the attached figure.
To succesfully do so, I have changed the btol to both non-default and default values. What I notice is that for the same geometry the aptn sometimes does work and sometimes doesn't, when using the same btol value.

Errors i receive are:

Topological degeneracy detected for APTN command. Try modifying
geometry slightly or loosening the tolerance (BTOL command). If BTOL
is relaxed, be sure to change the tolerance back to the default after
operation.

or:

Current ANSYS geometry failed to support boolean operations. See list
error window for details.

or:

Boolean operation failed. Try adjusting the tolerance value on the
BTOL command to some fraction of the minimum keypoint distance.Model
Size (current problem) 6.976333e-01, current BTOL setting
1.000000e-03, minimum KPT distance 2.828427e-02.

I don't understand this inconsistency when using the same btol values. Anybody that can help me out?
(This is part of a very lengthy code which is why I initially do not share the code)

[germa89]

Unfortunately CAD capabilities haven't keep up to the latest technologies in MAPDL.

I would suggest you to change the way you are getting your geometry. For instance, from the picture you are attaching, you could avoid the slide, by strudding the volume up to that slicing plane. Then select the area of the volume in the location of the slicing plane, and copy it on the same location. Then strude that area until you wish, creating the second half of the volume.

Not sure if it super clear, but I hope it helps.

I cannot offer other advice for this matter. Maybe @mikerife @pmaroneh @RGPATCHI can give you some inputs.