[Gmsh] About defining different element size

[Christophe Geuzaine]

On 10 Nov 2012, at 13:22, Liu David <xyliu1990 at gmail.com> wrote:

> Dear all,
> Greetings！
> I am a new user in Gmsh. What I want is not complicated. I have an area of which some part need more meshes and others need less. I tried to use two approaches:
> 1. select and define some points need more meshes, and use Attractor and Threshold to define a size field. 
>     However, I found that near the points(I uesd in Attractor to compute distance), there are very dense meshes, and if zoom in, I found the very near part are not triangles at all(strange things , even no closure shape)! 
> 2. select and define some points need more meshes, and give them small element size(lc), then embed them in the surface. 
>     However, I found even size are big enough, the meshes can not be sparse since the points I define have to be the nodes of the triangles. Yes?
> 
> I write simple .geo files attached for illustration of the two problem. Could you please help me ?   Thank you very much!
> 

Have a look at size "Fields" (e.g. tutorial/t10.geo).


> -- 
> Best wishes!
>  
> Sincerely yours,
> Liu Xiaoyu
> 
> <problem1.geo><problem2.geo>_______________________________________________
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine