Discussion Forum

Dear Antonin,

You do not state whether you are using cylindrical infinite elements in 2D, 2D axisymmetry or in 3D. The details are different dependent on which of those cases that applies.

2D: The cylindrical infinite elements should be applied to an outer annular region that can be created using the "Layers" setting of the circle feature or using concentric circles. That is it applies to a geometry that extrudes to a cylinder in 3D.

2D axisymmetry: Cylindrical infinite elements should be applied to the rightmost rectangular region and (optionally) to the top and bottom (and "corner") rectangular regions. In the geometry, you can use the "Layers" setting of the rectangle and square features. N.B. If your geometry outline is a semicircle, you should use spherical infinite elements for the outermost spherical layer - cylindrical infinite elements can only be used on geometry fetures that correspond to (revolves to) a cylinder in 3D!

3D: Apply cylindrical infinite elements to outermost cylindrical layers and top/bottom layers (and intersections between those). You can again use the Layers setting in the cylinder geometry feature to create the necessary domains.

So beware that the choice of Cartesian, cylindrical or spherical infinite elements depends on the shape of your corresponding 3D geometry outline (box, cylinder, sphere). It has no formal connection whatsoever to what base coordinate system your geometry is using (though obviously Cartesian will never apply in 2D axisymmetry and spherical will never apply in planar 2D for obvious reasons).

--
Magnus

Thank you for your detailed answer!