[Gmsh] Mesh refinement along line

[Christophe Geuzaine]

> On 5 Oct 2018, at 11:16, Octavio Castillo Reyes <ocastilloreyes at gmail.com> wrote:
> 
> Dear mesh users and gmsh team, 
> 
> I'm using gmsh to mesh a 3D domain (unstructured tetrahedral). My simulations require a refinement over a line but I don't know how to obtain a specific element size, namely, increase the element size from a given point P as follows:
> 
> |-----------------|-------------|------------|---------|------- P -------|---------|------------|-------------|-----------------|
>         A/2         A/4        A/8      A/16   A/32   A/32   A/16     A/8         A/4         A/2
> 
> where A is the characteristic length in the domain. Which is the correct way to get the desired refinement? I'm not sure if a field attractor is a good solution, if yes, how setup it? 

You could use Field(MathEval) : you can prescribe any mathematical function you want as mesh size. See tutotial/t10.geo for an example.

CG

> 
> Best regards
> O.
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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