[CIG-SEISMO] creating mesh file for a pipe model

[胡久鹏]

Dear Help Team,

I would like to compute the 3-D wave propagation in a water-filled pipe, with the source in the middle of the pipe.
I wonder how to define the boundary condition for this purpose for using cubit2specfem3d.py to export available mesh files.
For general brick model,  six blocks are needed: face_topo, xmin, xmax, ymin, ymax and bottom. But there are only three faces in the pipe model: xmin,xmax and outside-cylinder surface. 
Thank you very much for your help/comments.
Kind regards,
Volan Hu
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