Watertight Meshing

A watertight meshing is an important knowledge that can help you perfect your meshing to avoid potential simulation errors.

Definition

An adequate meshing respects the shape of the geometry and is watertight.

Note: An adequate meshing shape should have priority over a watertight meshing.

  • A watertight meshing is a meshing without holes.

    In a watertight meshing, the triangles share common vertices on the edges of faces.

  • A non-watertight meshing is a meshing with holes on the sides of faces.

    A non-watertight meshing may generate errors in the simulation result as rays can pass through these holes whereas they should not. However, a non-watertight meshing can be negligible and the simulation result can be close to a physical result is the meshing is fine enough.

Non-watertight Meshing: Cause

A non-watertight meshing can be the consequence of faces of a body that are meshed independently of each other. This can happen if :

  • The meshing mode Proportional to Face size is defined.

    Note: When the modes Proportional to Body size or Fixed are used, the meshing is watertight.
  • A local meshing is applied on a face.

  • A coarser meshing is applied, due to Speos failing to apply the defined meshing values.

    For more information, refer to Meshing Warnings.