[Sebastian_Vienna]

Hi everyone

I have a scan of a laserstructured surface (not flat) as an .stl file and my goal
is to get the "imprints" (meshes) of both sides of this surface and the meshes should merge perfectly without a gap.

With snappyHexMesh I can get the mesh of only one side of the surface.
(Attachment: Mesh_of_only_one_side.JPG)
(Attachment: Surface_and_upperSide.JPG)

When i apply snappyHexMesh for each side of the surface in a seperate case and try to merge the meshes of both sides of the surface there is a small gap inbetween.
(Attachment: Upper_and_lower_Side_with_Gap.JPG)

How can i get a perfectly fitting mesh without a gap?

I am very grateful for every idea that could solve this problem.

Best wishes

Sebastian

[Yann]

Hello Sebastian,

What OpenFOAM version are you using? There are 2 ways to achieve it depending on the branch.

Regards,
Yann

[Sebastian_Vienna]

Hello Yann,

thank you for your reply!

I am using Version 6.

Regards,

Sebastian

[Yann]

Thanks for your answer.

In snappyHexMeshDict, you can define cellZones for each side in order to keep both sides in the final mesh, with a snapped interface in-between:

refinementSurfaces
{
	upperSide
	{
		// Surface-wise min and max refinement level
		level (1 1);

		faceZone upperSide;
		cellZone upperSide;
		cellZoneInside inside;
	}

	lowerSide
	{
		// Surface-wise min and max refinement level
		level (1 1);

		faceZone lowerSide;
		cellZone lowerSide;
		cellZoneInside inside;
	}
}

Have a look at the snappyMultiRegionHeater tutorial.

Regards,
Yann

[Sebastian_Vienna]

Hello Yann,

thank you for your fast reply and the hints!

I will try that

Again thank you very much.

Regards,

Sebastian