Error 85: Singular field on the edge of a triangle.

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

I see the following error:

Error 85: Singular field on the edge of a triangle.


What does it mean and what should I do to fix it?

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Answers

  • JIF
    JIF
    Altair Employee
    edited June 2017

    The error can occur when there are extremely small triangles in the mesh. An indication of this will be a warning from the kernel:'WARNING 33131: Inhomogeneous segmentation for triangles.'

    If the OUT file is viewed there may be a message similar to the following: 

     Minimum edge length of triangles in m:   6.52484005E-008 (edge  7369) Maximum edge length of triangles in m:   0.0050131958 (edge  3826) Ratio of the max/min edge length is   76832.4704 WARNING  1663: Inhomogeneous segmentation for triangles  Minimum surface area of a triangle in m*m:   3.48065863E-011 (triangle  2073) Maximum surface area of a triangle in m*m:   6.79009687E-006 (triangle  2811) Ratio of the max/min triangle surface area is   195080.805  WARNING 33131: Inhomogeneous segmentation for triangles.

     

    Users can use the Find elements tool in POSTFEKO (the binoculars icon on the Mesh tab on the 3D context menu) to locate the triangles by number. In CADFEKO users can also use the merge coincident vertices tool under the Meshing tab to fix these problems.

    The message from CADFEKO is typically as follows:

    merge_coincident_vertices_message.jpg

    After receiving this message just save the model and run FEKO.

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