[DeanM]

Hi ICEM experts,

I am looking for advice concerning the following problem in my hexa mesh:
The problematic part of my domain is a pipe with decreasing diameter, see figure 1.
Further upstream is a complex geometry, therefore there are many blocks which need to be within the pipe. The edges are associated correctly and the surface mesh looks how it should using an O-grid (figure 2).

However, within the core of the pipe weird cells are created. The edge distribution within the core is shown in figure 3. All edges are set correctly and the blocks look the way they should, see figure 4.

Now, if I turn on "projected mesh shape" when displaying the edges, it becomes obvious that the inner edges are aligned to the surface shape (figure 5). Since there is not enough space to do so, I am getting negative volumes.

Is there a simple way to overcome this problem? Just to keep the inner edges straight and not affected by the surface shape?

Thanks a lot!

[kad]

Did you delete the blocks outside the pipe correctly? You can force a straight shape of edges by linking them to other straight edges.

[DeanM]

Yes, the outer blocks are deleted. Thanks for the suggestion, I fixed it now by linking the edges to a random straight edge in the domain.