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  • #1116

Closed
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Opened Dec 14, 2020 by orxan shibliyev@orxshi

Smooth transition from surface to volume mesh

Is element size is defined differently for surface and volume mesh? No matter how I choose lc, I cannot get a smooth transtion from surface to volume. Elements on surface are much smaller than volume elements near boundary although element size should depend on distance from surface.

I guess surface element size is also affected by geometric points on surface. If that's the case, then it is unfortunate because I make points as much as possible in order to obtain good CAD model. Would you help please.

Merge "wing0.brep";

Mesh.ElementOrder = 1;
Mesh.Algorithm = 1;
Mesh.Algorithm3D = 10;
Mesh.Format = 1;
Mesh.MshFileVersion = 2.2;
Mesh.MeshSizeExtendFromBoundary = 0;
Mesh.RandomFactor = 1e-6;

lc = 0.01;
Field[1] = Distance;
Field[1].SurfacesList = {10, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 11, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 12, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 13, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 14, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 15, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 16, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 17, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 18, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 19, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 20, 200, 201, 202, 203, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 4, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 5, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 6, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 7, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 8, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 9, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99};
Field[1].NumPointsPerCurve = 200;
Field[2] = MathEval;
Field[2].F = Sprintf("F1/20 + %g", lc);
Background Field = 2;

img wing0.brep

Edited Dec 14, 2020 by orxan shibliyev
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Reference: gmsh/gmsh#1116