[Gmsh] Extrude for unstructured mesh

Stephan Gekle stephan.gekle at uni-bayreuth.de
Mon Feb 29 17:29:07 CET 2016

Dear Mikhail,

great, your solution works. Thanks a lot.
The reason why it did not work for me, is that I did not (and in fact 
still don't) know how extrude determines the id's of the outer surfaces. 
I tried to look it up in the manual: 
But it does not seem to be described there.

How did you know that the relevant numbers were: 13, 25, 37, 49, 10, 22, 
34, 46 ?

Thanks again,


Am 29.02.16 um 16:20 schrieb Mikhail Artemyev:
> Hi Stephan,
> I selected the outer surfaces as "Physical Surfaces", and it seems to 
> work for me. Please, add this line at the end of your file and see if 
> it works for you as well (as you know, you can replace 101 with 
> whatever number you want to describe the outer surfaces).
> Physical Surface(101) = { 13, 25, 37, 49, 10, 22, 34, 46 };
> Best,
> Mikhail
> On 02/29/2016 05:00 AM, gmsh-request at ace20.montefiore.ulg.ac.be wrote:
>> Dear all,
>> I have created a script which meshes an axisymmetric surface by
>> extrusion (see attachment). Then the mesh contains both the outer
>> surface of revolution as well as the four inner auxiliary surfaces which
>> were used/created by the extrusion.
>> In the final mesh, I would like to have only the outer surface of
>> revolution. I have tried to either delete the inner surfaces or to
>> select only the outer surfaces as "Physical Surfaces". Both attempts
>> have failed.
>> Would someone have a hint how to go about that?
>> Thanks a lot in advance!
>>      Stephan

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