I am getting the error message 30420 that the tolerance (epsilon) for integrating the nodes into the lines is too large. What can I do?

Answer

The tolerance epsilon can be found in the FE mesh settings in the "General" window section. It controls the behavior of the FE mesh generator when nodes are very close to lines. Figure 3 shows the difference. If the tolerance is greater than the distance of the node to the line, this small local difference in the mesh generation is neglected. In the case shown, the mesh of the line is deflected towards the node. In this case, the line is no longer ideally straight. If the tolerance is smaller than the distance, a separate FE node is generated for the node.

The error message appears if the distance between two adjacent nodes is smaller than epsilon and they are connected by a line (see Figure 3). In most cases, this is due to an inaccuracy in the modeling. Since the error message contains no information about node numbers, you can use the model check "Identical Nodes". The program searches for nodes whose distance meets the tolerance delta. Now set the Tolerance value to the value of epsilon. Then, the nodes are listed in the upper part of the dialog box.

As described below, the descriptions differ depending on the case. If there is an inaccuracy in the modeling, it can be adjusted. In other cases, it is, of course, possible to further reduce the tolerance of epsilon.

Keywords

Tolerance Integrate Epsilon FE mesh Identical nodes Model check

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