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I see the following error:
Error 87: Singular field on the edge of a triangle.
What does it mean and what should I do to fix it?
This error message can occur when the mesh has overlapping triangles. This can be caused by creating geometry with very fine detail. Often this is not intended, but the result is that some vertices end up in very close proximity to each other.
It can also occur if, for example, two triangles are separated by a distance smaller than the maximum identical distance** (found in the EG card in the .pre file). The default for the maximum identical distance is 1e-6 m. This value is changed when one specifies, for example, to work in mm in CADFEKO. Then the EG card contains a different value than the default.
It is best to make changes in the geometry to avoid the small triangles, else the nearly coincident vertices can be merged using the 'merge coincident vertices' tool on the Mesh menu after selecting the mesh in question in the tree.
** The maximum identical distance is a distance limit in FEKO where any two or more mesh vertices that are within this distance from each other are considered to be the same vertex.
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