Hi Jun,

It seems that your last volume definition is wrong. Attached is a file where 
the volume is defined interactively - does it work? 

Christophe

Attachment: pipe2.geo
Description: Binary data


> On 29 Aug 2016, at 21:22, Junhui Liu <[email protected]> wrote:
> 
> Hi All, 
> 
> I am generating structured tetra meshes (without the final recombine)  inside 
> and outside a pipe. Please see the attache plot. Using structured tetra 
> meshes outside the pipe is to control the time step size.  There are three 
> regions generated. Two are structured tetra meshes and another one is the 
> regular unstructured tetra mesh.  Somehow our internal code complains that 
> "Boundary face construction failed with: xxx faces remaining”. if I use a 
> version that does not care about boundary construction, It appears that the 
> results of the cylindrical surface pointed by blue arrows behave very 
> strangely and look like those of a boundary face. If I take region III away, 
> the problem disappears. I have also attached the pipe.geo file. 
> 
> I have to say GMSH has lots of functionalities to control mesh and I really 
> like it. I hope this problem can be resolved soon. Thanks a lot for your help.
> 
> Jun
> <pipe.geo>
> 
> <mesh_topology.pdf>
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

Free software: http://gmsh.info | http://getdp.info | http://onelab.info

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