Boundary layer meshing considerations

Imprinting on adjacent faces

The boundary layer mesh leaves an imprint composed of quadrilateral elements on faces adjacent to the boundary layer faces. The software creates triangular elements on the rest of the non-boundary layer faces. In the following figure, the orange faces are the non-boundary layer faces.

The software collapses the boundary layers to the polygon edges instead of leaving imprints on adjacent faces in the following conditions:

• When you create a 2D mesh on a face adjacent to the boundary layer faces.

• When you define mesh mating conditions on an adjacent face.Exception: Suppose there is a mesh mating condition on the common face of two adjacent polygon bodies and the common face is adjacent to the boundary layer faces of the polygon bodies. Should you mesh both polygon bodies at the same time, the software leaves an imprint on the adjacent face and creates a continuous boundary layer mesh across the polygon bodies.

• When the angle between the boundary layer face and an adjacent face is greater than the Maximum Imprint Dihedral Angle. You define the Maximum Imprint Dihedral Angle in the Boundary Layer Options group. For more information, see Boundary Layer Options group.

In some cases, the constraint to have no imprints on faces can lead to the software not being able to generate the boundary layer mesh.

Selection on faces adjacent to two bodies

When you define the boundary layer mesh control on a face that is shared by two bodies, the software creates two boundary layer meshes, one on each body. In the following figure, there is one body inside the circle and one outside.

If you want to restrict the boundary layer to one side of the shared face, select the Restrict to Selected Bodies check box in the Mesh Control dialog box.

Usually two adjacent bodies do not share faces. In this case, the software creates a boundary layer mesh on the body that contains the selected face. If you want to create a boundary layer mesh on a surface wrap body, make sure to select a face that belongs to that body.

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