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    $\begingroup$ That's because MeshRegion can not deal with the second order Prism elements. Try this: mesh1 = ToElementMesh[rtext, "MeshOrder" -> 1]; mesh2 = ToElementMesh[rline, "MeshOrder" -> 1]; productMesh = ElementMeshRegionProduct[mesh1, mesh2]; MeshRegion[productMesh] $\endgroup$ Commented Feb 23, 2024 at 8:49
  • $\begingroup$ @user21 Thanks! $\endgroup$ Commented Feb 23, 2024 at 9:43
  • $\begingroup$ @cvgmt Thank you so much! I have no clue why I must use a machine number as the second Line coordinate, or why the 0 can remain an integer. As a (so far) non-FEM-user, I was equally surprised by the connection to FEM and to NDSolve, and I look forward to learning more about it. Thank you! $\endgroup$ Commented Feb 23, 2024 at 9:53
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    $\begingroup$ @user21 Are second-order prism elements ones with curved boundaries? So much to learn – thank you! $\endgroup$ Commented Feb 23, 2024 at 9:57
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    $\begingroup$ @FelixKasza, yes, curved edges: In the Details and Options section of PrismElement the is an illustration. $\endgroup$ Commented Feb 23, 2024 at 10:24