ABAQUS COMPOSITE COMPONENT MESH ISSUES

[Al_ameen]

[highlight #8AE234][COLOR=][highlight #3465A4][highlight ]Good Day everyone. I am an Offshore Masters degree student and I am currently modelling an offshore wind turbine transition piece to be analysed in ABAQUS for fatigue life.
I modelled the component with its braces and base plate in AUTOCAD 3D before importing into ABAQUS.
MY problem right now is to mesh using HEX meshing. I have tried severally to partition before and after importing into ABAQUS but I still face the problem of some parts where two cylinders intersect being unable to be partitioned.
I would be very glad if anyone could help me with any other means to achieve the required general hex mesh.
Also, I generally want to ask if it will be sufficient to seed using 3 and Tet meshing instead as I am sure if it is fine enough to give me the best results.Attached to this are images of the tet meshing and the parts of the hex meshing which have been successful and the parts which I have been unable to do.
I look forward to any help I can get, and I would be glad to also share the STP file if anyone is willing to help.

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[FEA way]

In some cases, quite a few partitions are needed to be able to mesh with hexahedral elements. Try to brake these remaining regions into even simpler shapes. Dividing into half in various directions often helps but separation from other shapes is also crucial (you have to ensure proper transitioning). Virtual topology tools may also help in some cases.

However, if you can't create a hexahedral mesh, it's usually fine to use a tetrahedral one instead. You will just need more elements to obtain the same accuracy.