I’m trying to plot the stress contour in a plate with a circular hole. Due to symmetry, only one quarter was simulated. A VTK file for coordinates of all nodes with the associated stress component (scalar) was generated. Then opened the VTK file in Paraview and used Delaunay 2D filter and got the result as in the attached image. As can see, the curved edge was changed to a straight edge while it should look as in the second image when I used only points to output the stress contour.
This is expected, the Delaunay filter will return by default the convex hull of your input dataset . You can however experiment with the Alpha parameter. From the documentation (hitting ? button ):
The value of this property controls the output of this filter. For a non-zero alpha value, only edges or triangles contained within a sphere centered at mesh vertices will be output. Otherwise, only triangles will be output.
. I actually tried playing with Alpha parameter and the best result I got is when Alpha=0.2 but still not the a prefect quarter-circle as seen in the new image. It kind of approximated by line segments.
Sorry, I forgot to mention that I’m using a meshless numerical method (point collocation method) in the analysis and thus no elements are used in the discretization of the domain but just a cloud of points.