[Gmsh] Error: cannot tetrahedralize volume with quadrangles on boundary

[Jinbiao XIONG]

Hi,

I am new to gmsh. Now I am trying to generate a mesh for helical coil
cooler, including the tube side and the shell side. The tube has been
generated by extrusion. So the tube surface are discretized with
quadrangles. For the shell side, I am using tetrahedron. But I got trouble
on the tube surface, I guess. The error I came up with is "cannot
tetrahedralize volume with quadrangles on
boundary**<http://geuz.org/pipermail/gmsh/2009/004735.html>".
Is there any way to avoid this?

Thanks for any recommendation.

P.S. I attached my geo file in this mail.

Best regards,

Jinbiao
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