[Gmsh] Hybrid Mesh Error: cannot tetrahedralize volume with quadrangle on boundary

[Rajib Roy]

Hello Gmsh Team,
I've a beginner in Gmsh.
My goal is to mesh a cylinder in a cube, where the cylinder wall should be
structured and rest of the cube is unstructured. With Frontal 3D meshing
technique I've got "Error: cannot tetrahedralize volume with quadrangle on
boundary".
The geometry file is attached for you kind consideration.

It will be highly appreciated if you kindly direct me the way to solve this
problem.
I look forward to hearing from you.

Best Regards,

Rajib Roy,
Grad Student
University of Wyoming, WY, USA
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