On 16 Jul 2012, at 17:12, Giorgos Kourakos wrote: Hi I'm trying to mesh a simple geometry with lines and points.
I want the mesh to be refined around the points and the lines up to a specified distance
To do so, I define an Attractor field and a MathEval field with the following relation "20*exp(-(F1/400)^2)" (radial basis function), where 20 is the minimum desired length near the attractor and 400 is the distance from the attractor that the relation vanishes to zero.
I'm attaching also the *.geo file
The zoom_out.png image shows that the distribution is somewhat as expected, however when I zoom (zoom_in.png) I see that just around the point attractors the elements have larger size compared to the desired lengths.
I have tried to change the points desired length, which partly solves my problem (see zoom_in_1.png) but this refines unnecessarily the mesh in the area between the points and line (see zoom_out_1.png plot)
Hi Giorgos,
As defined, the function "20*Fabs(Exp(-(F1/400)^2))" takes the distance to the attractors as argument (which is approx. in [0,10000]): this gives  which is coherent with the mesh you get (since by default Gmsh takes the minimum of the field and the mesh sizes defined at the CAD points).
For further testing you can plot your fields using Mesh->Define->Fields in the GUI.
Christophe
I would appreciate any thoughts and suggestion
Kind regards
Giorgos
--
Giorgos Kourakos, Phd
Land Air and Water Resources
229 Veihmayer Hall
University of California Davis
Γιώργος Κουράκος
<large_examp.geo><zoom_out.png><zoom_in.png><zoom_in_1.png><zoom_out_1.png>_______________________________________________
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