The error message you're encountering in Gmsh indicates that the nodes in your STL file are not located on the z=0 plane, which is a requirement for elements representing plane stress, plane strain, or axisymmetric conditions.
Here are two possible solutions to address this issue:
* Modify your STL file: Use a mesh editing tool to reposition the nodes in your STL file so that they lie on the z=0 plane. This ensures compatibility with the element types you're using in your analysis.
* Adjust the element type in Gmsh: If modifying the STL file isn't feasible, you can modify the element type in Gmsh to suit the geometry of your model. Gmsh offers various element types like tetrahedral or hexahedral elements that can handle nodes not on the z=0 plane.
For more information on element types in Gmsh, you can refer to the Gmsh documentation: [gmsh documentation ON gmsh.info]
More information on the error message you're encountering in Gmsh. I've provided two solutions that you can explore to address the issue:
* Modify your STL file to reposition the nodes on the z=0 plane.
* Adjust the element type in Gmsh to suit the geometry of your model.
If you'd like to delve deeper into element types in Gmsh, I recommend referring to the Gmsh documentation for a comprehensive explanation.
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