You will need to decompose it further. Please check following video on hex meshing.
Please check following videos
Ansys Meshing: Decomposition for hex meshing:
https://www.youtube.com/watch?v=P19GOTQWmc0
Ansys Meshing: Meshing Methods:
https://www.youtube.com/watch?v=nEOC8rDnnRo
Please go through help manual for more details
Regards,
Keyur
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