Plaxis 2d 8.6 -
The mesher in V8.6 is strictly structured. While reliable, it lacks the refined local meshing controls of the "Plaxis Designer" tools today. You have to use "cluster" refinement, which can sometimes lead to oddly shaped triangles if not manually adjusted.
A typical verification example in PLAXIS 2D 8.6 manual: plaxis 2d 8.6
To provide context, it is important to note that PLAXIS 2D 8.6 is considered a (released roughly around 2006–2007). While it was the industry standard in its time, the software has since evolved (currently owned by Bentley Systems and at versions 20+). The mesher in V8
Version 8.6 shipped with a robust set of material models that covered 90% of practical geotechnical problems: plaxis 2d 8.6

