[Gmsh] Line loop and Open cascade

[Christophe Geuzaine]

> On 22 Feb 2018, at 12:56, Sathyanarayan Rao <sathyanarayan.rao at uclouvain.be> wrote:
> 
> Dear gmsh team,
> 
> Is it not possible to use both line loop type surface definition and open cascade rectangle. I always have problem with using both.

Sure you can: but you need to put SetFactory("OpenCASCADE") at the begining of your file: otherwise you create the first entities with the built-in CAD kernel ; and the rest (after SetFactory) with open cascade.


>  
> For example in the below code, surface 105 is unrecognized ! 
> 
> // mesh size description
> 
> cl_1   =  0.3;
> cl_2   =  0.02;
> cl3    =  0.02;
> Mesh.CharacteristicLengthMax = 40;
> extend = 15;
> 
> // define inversion region
> 
> Point(1) = {-0.05, 0.005, 0, cl_2};
> Point(2) = {7.25, 0.005, 0, cl_2};
> Point(3) = {7.25, -1.45, 0, cl_2};
> Point(4) = {-0.05, -1.45, 0, cl_2};
> 
> // define bounding box
> 
> Point(5) = {-0.05-extend, 0.005, 0, cl_1};
> Point(6) = {7.25+extend, 0.005, 0, cl_1};
> Point(7) = {7.25+extend, -1.45-extend, 0, cl_1};
> Point(8) = {-0.05-extend, -1.45-extend, 0, cl_1};
> 
> Line(1) = {1, 2};
> Line(2) = {2, 6};
> Line(3) = {6, 7};
> Line(4) = {7, 8};
> Line(5) = {8, 5};
> Line(6) = {5, 1};
> Line(7) = {1, 4};
> Line(8) = {4, 3};
> Line(9) = {3, 2};
> 
> // Definition of regions
> Line Loop(101) = {2, 3, 4, 5, 6, 7, 8, 9};
> Plane Surface(102) = {101}; // Outer box
> Line Loop(105) = {1, -9, -8, -7};
> 
> 
> // geological body
> 
> SetFactory("OpenCASCADE");
> Rectangle(1) = {0.1, -0.2, 0, 0.5, 0.1, 0};
> Rectangle(2) = {0.1, -1.0, 0, 0.3, 0.7, 0};
> Rectangle(3) = {3.1, -0.6, 0, 1, 0.5, 0};
> Rectangle(4) = {4.2, -1.2, 0, 1, 0.5, 0};
> Rectangle(5) = {5.6, -0.9, 0, 1, 0.5, 0};
> Plane Surface(110) = {105,1,2,3,4,5}; // Inner box without geological body
> 
> 
> // Definition of boundaries
> Physical Line(1) = {6, 2, 1}; // Free surface
> Physical Line(2) = {3,4, 5}; // Mixed boundary conditions
> 
> // Definition of physical regions
> Physical Surface(1)  = {102}; // No-inversion region
> Physical Surface(2)  = {110}; // Inversion region
> Physical Surface(3)  = {1}; // Geological body 1
> Physical Surface(4)  = {2}; // Geological body 2
> Physical Surface(5)  = {3}; // Geological body 3
> Physical Surface(6)  = {4}; // Geological body 4
> Physical Surface(7)  = {5}; // Geological body 5
> 
> 
> 
> Best Regards,
> 
> Sathyanarayan Rao, PhD student
> Earth and Life Institute/Environmental Sciences (ELI-e)
> Université catholique de Louvain
> c.037, Croix du Sud 2, Louvain-la-Neuve, Belgium
> Phone: 010473827 ( intercom 73827)
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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