[Gmsh] gmsh

[Shawn Fostner]

 From the (little) experience I've had, both box fields and attractors 
with a threshold field, say at edges and nodes, have no problem with the 
different physical volumes. The geometry I usually mesh is right at the 
boundary of 2 volumes and the mesh transverses the interface just fine. 
So it should work fine. Which fields you use will take some playing 
around with, and depends on your particular geometries. I find the box 
fields more effective for me, even a fine threshold near an edge doesn't 
refine as effectively, but thats something thats geometry specific I 
suspect. Good luck.

Shawn

Geordie McBain wrote:
> 2009/7/24 Joakim Sandström <joakim.sandstrom at brandskyddslaget.se>:
>   
>> I have become a fond user of gmsh when creating geometries for thermal
>> calculations. I’ve run in to trouble in these calculations when the
>> temperature gradient is very steep with a mesh that is to coarse. The
>> problem is that I do not need a fine mesh anywhere else but close to the
>> certain boundaries where the temperature gradient is steep. Creating a fine
>> mesh in the whole volume demands to much computational time. Is there a way
>> to separately specify the grid size within different physical groups?
>>     
>
> I'm not sure about within different physical volumes, but I think you
> should be able to achieve the effect you want using Background Fields,
> in particular based on an Attractor at points near that certain
> boundary where the temperature gradient is steep.  See
> demos/fields.geo in the source distribution directory.
>
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