[Gmsh] Almost structured mesh - Why aren't they structured?

[Paolo Tricerri]

Dear Feifei,

I thank you for your help. At the moment, I have fixed my problem
making the curved surface structured, extruding it and then, even if
the two ends are not completely structured, I have seen that the
results are good.

thanks again,

Paolo

2012/9/21 Paolo Tricerri <paolo.tricerri at epfl.ch>:
> Dear Feifei,
>
> I thank you for your help and I had a look at the code you sent.
> Unfortunately, I must use tetrahedral meshes. Is there a way to have
> the same structured mesh you sent me but with tetrahedra?
>
> Many thanks
>
> Regards,
>
> Paolo
>
> 2012/9/21 Feifei TONG <tongf.fei at gmail.com>:
>> Hi Paolo,
>>
>> I will Recombine the surfaces and volumes to make the mesh structured.
>>
>> See attached the revised file.
>>
>> Regards,
>> Feifei
>>
>>
>> On 20 September 2012 22:02, Paolo Tricerri <paolo.tricerri at epfl.ch> wrote:
>>>
>>> Dear Gmsh users,
>>>
>>> I have a small question about how GMSH extrudes a meshed surface. The
>>> script I have attached to the email, creates a cylindrical tube
>>> extruding one of the two flat borders in the z direction. The mesh of
>>> the extruded border is structured and symmetric w.r.t the line x=y
>>> (the straight line of 45 degrees). When I extrude the mesh, the two
>>> curved surfaces I get are almost structured. There are some elements
>>> (placed in random position?) which make the mesh non completely
>>> structured.
>>>
>>> Why this? I would need a structured mesh and not an almost structured
>>> mesh. Is that possible to have the two curved surfaces structured?
>>>
>>> Many thanks for any suggestion,
>>>
>>> Paolo
>>>
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>>
>>