[student666]

Hi all,

I’m facing some big issues about layer addiction with cfMesh on sharp edges.
My geometry is quite simple; what is challenging me, they are the two 45° pipes inside the domain.
As you may see by enclosed links, pipes are cut and sharp edges are present; small blu lines are skewFaces: skewness > 4.4

As you may see by following meshDict

SurfaceFile "regionAirAmb.fms";

maxCellSize 0.002;  

//minCellSize 0.001;
//boundaryCellSize 0.002; 

/*
edgeMeshRefinement
{

	edgeMesh1
	{
		edgeFile	"edgeAmb1.vtk"; //sharp edges
		cellSize 0.001;
	}
	
}*/


/*
localRefinement 
{
    interAirSolido2 //near sharps edges
    {
        cellSize 0.001;
//		refinementThickness  0.001;
    }
    interAirSolido3 //near sharps edges
    {
        cellSize 0.001;
//		refinementThickness  0.001;
    }
    interAirSolido4 //near sharps edges
    {
        cellSize 0.0005;
//		refinementThickness  0.001;
    }

}*/

boundaryLayers
{

	patchBoundaryLayers
	{
		"interAirSolido.*"
		{	
			nLayers 5;
			thicknessRatio 1.2;
		//	maxFirstLayerThickness  0.004;
		//	alllowDiscontinuity		1;
		}
		wallAirAmb
		{	
			nLayers 5;
			thicknessRatio 1.2;
		//	maxFirstLayerThickness  0.004;
		//	alllowDiscontinuity		1;
		}

	}
}

I’ve tried many combinations of the meshDict to get rid of skewness and nonOrthogonality on the faces at the sharp edges.

What I can say is:

- distance between cut pipe and domain is approximately 2mm
- if I set 2mm for minCellSize or boundaryCellSize, with nr.3 layers I can get a poor good mesh;
- If I use increaseMeshQuality, with nr.3 layers I can get rid of problem faces, but layers are not so many

then

- if I increase the refinement up to 5e-4mm and 3 layers, I get a mesh with more skewFaces and nonOrthogoanlFaces.

Then

If I use 2mm for minCellSize or boundaryCellSize, with layers > 3 skewness and nonOrthogonality increase

If with both of the upper settings I use increaseMeshQuality, I can’t get rid of the problem faces.

So, the question is simple, what should I do?

I meshed the stl by using Salome and all surface checks are positive.
I also tried to increase the resolution of the cells on the problem edges, but no effects.

What should I do?

https://www.dropbox.com/s/blh0mc2zcrsrt86/stl.PNG?dl=0
https://www.dropbox.com/s/bhf00sq08z...eshed.PNG?dl=0
https://www.dropbox.com/s/bgdxhgwt70...Faces.PNG?dl=0
https://www.dropbox.com/s/blh0mc2zcrsrt86/stl.PNG?dl=0

stl file of the domain:

https://www.dropbox.com/s/kzkr3w1ubd...irAmb.zip?dl=0

[mAlletto]

hey hey,


did you find a solution?