[Gmsh] Composite RVE

[Christophe Geuzaine]

> On 10 Dec 2020, at 14:34, Hossam Ragheb <har1g15 at soton.ac.uk> wrote:
> 
> Hi,
> 
> I am new to gmsh, so apologies if the answer to my question is obvious.
> 
> I coded a .geo file (Attached) to create 3D RVE with fibers in a matrix that includes voids.
> 
> The process simply is :
> 
>     1- Create box of the matrix material.
> 
>     2- Create voids using Sphere command and BooleanDifference to remove these from the matrix material.
> 
>     3- Create fibers as Cylinders and and utilise BooleanFragments to include the cylinders in the matrix.
> 
> I have one persistent problem, once the mesh is created the fibers are meshed as hollow cylinders, however i need them to be solid.
> 
> Its interesting behavior. Last thing to note that mesh size affects the outcome, for example when the min/max mesh size is 2, the result is solid cylinders, but with mesh size of 1, it becomes hollow.
> 
> It there a way to force the meshing algorithm to mesh the cylinder as solid object?
> 
> I have attached the .geo file, please let me know if you can help.
> 
> Any suggestions?


The geometry is a bit tricky: it's almost degenerate (with some cylinders very close to the boundary), and the parametrization of some curves does not seem monotonic. I've successfully meshed with the following parameters:

MeshSize{305, 310} = 0.5;
Mesh.MeshSizeMax = 2; // successfully tested with 1 and 2
Mesh.AngleToleranceFacetOverlap = 1e-6;
Mesh.Algorithm3D = 10;

Christophe


> 
> Thanks,
> 
> Hossam Ragheb
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://people.montefiore.ulg.ac.be/geuzaine