Creo Simulate > Reference Links > Elements with Approximated Linear Edges
Elements with Approximated Linear Edges
While adding elements to your model, AutoGEM keeps track of elements that are invalid because of geometry problems. After adding all the good elements, AutoGEM attempts to complete the mesh by creating elements with approximated linear edges in areas where invalid elements occur. Creo Simulate adds the approximated elements to a new group named approx_elements. This group is only visible if you transfer the model to independent mode.
Because approximated elements can affect the accuracy of your analysis, you should review the areas of your model that require approximated elements.
In some cases, AutoGEM might not generate a full set of elements on surfaces and volumes. See Strategies for Using the Surface Option and Strategies for Using the Volume Option for information on actions you can take to enable AutoGEM to create additional elements.