[Gmsh] boundary layer in a 2D geometry

[Geordie McBain]

Le jeudi 22 novembre 2012,  <emmanuel.deltombe at free.fr> a écrit :
>
> Hello,
>
> I want to study a turbulent flow around a beam in 2D. I have installed
Elmer on my Ubuntu 12.04 configuration,
> as well as Gmsh.
> I am creating the 2D geometry and mesh with gmsh but I can't be able to
create a boundary layer.
>
> I open my .geo file in Gmsh GUI, click on Mesh > 1D then 2D,
> the mesh is created but not the boundary layer.
>
> The script of the .geo file is not long :
>
> cl1 = 0.02;
> cl2 = 0.1;
> Point(1) = {0, 0, 0, cl1};
> Point(2) = {0.3, 0.3, 0, cl1};
> Point(3) = {0.25, 0.35, 0, cl1};
> Point(4) = {-0.05, 0.05, 0, cl1};
> Point(5) = {-2, -0.7, 0, cl2};
> Point(6) = {1, -0.7, 0, cl2};
> Point(7) = {1, 1, 0, cl2};
> Point(8) = {-2, 1, 0, cl2};
> Line(1) = {1, 2};
> Line(2) = {2, 3};
> Line(3) = {3, 4};
> Line(4) = {4, 1};
> Line(5) = {5, 6};
> Line(6) = {6, 7};
> Line(7) = {7, 8};
> Line(8) = {8, 5};
> Line Loop(11) = {5, 6, 7, 8, -4, -3, -2, -1};
> Plane Surface(11) = {11};
> Physical Line(13) = {1, 2, 3, 4};
> Physical Line(14) = {6};
> Physical Line(15) = {8};
> Physical Line(16) = {5, 7};
> Physical Surface(12) = {11};
> Field[1] = BoundaryLayer;
> Field[1].EdgesList = {1, 2, 3, 4};
> Field[1].NodesList = {1, 2, 3, 4};
> Field[1].hfar = 0.05;
> Field[1].hwall_n = 0.02;
> Field[1].hwall_t = 0.003;
> Field[1].ratio = 1.1;
> Field[1].thickness = 0.01;
>
> I read the FAQ, the screencasts and the Gmsh reference manual,
> and didn't find the answer.
> Is it a bug ?
> I would be very grateful if anybody can help me,

Hello. After defining the Field as you have done, it must be selected with
the Background Field command.

-- 
G. D. McBain

Chercheur
Institut Jean le Rond d'Alembert - http://www.dalembert.upmc.fr

Theory of Lift - Introductory Computational Aerodynamics in MATLAB/Octave
Out now - http://www.wileyeurope.com/remtitle.cgi?111995228X
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