On Fri, 8 Apr 2016, Salazar De Troya, Miguel wrote:
> x > 0 && x < L && y > 0 && y < d
> I wonder if there are functions within libMesh that can make my life
> easier and if this has done before. I think I could use a
> ParsedFunction for this simple example, but I want more complicated
> geometries. I would like that rectangle to have a circular notch on
> the top side, for instance.
You can do constructive geometry with ParsedFunction. Even that
rectangle was expressed as the intersection of four half-planes, and
the subtraction of a circle would be similar:
((x>0)*(x<L)*(y>0)*(y<d)*((x-L/2)^2+(y-d)^2<r^2
The only big limitation I've noticed with fparser is that inline you
can only define new variables ("a:=4;y^a"); you can't define new
functions ("fourth(in):=in^4;fourth(y)") except in C/C++ code.
---
Roy
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