CAE: Mesh size and existence of singularities

In CAE, it is said that the finer the mesh size, the higher the analysis accuracy.

However, depending on the boundary conditions and model geometry, too fine a mesh may conversely reduce the accuracy of the analysis. These are called 'singularities'.

Singularities tend to occur in areas of the model where the corner Rs are zero or minute Rs.

If the stresses increase progressively as the mesh size is reduced, this singularity should be suspected.

Therefore, instead of judging by the maximum stress at the location with zero corner R, an evaluation should be carried out using the stress at a slightly offset location.

It is also advisable to carry out a re-analysis, if possible, adding a corner R of sufficient size to the location with zero corner R.

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