Please split that face in design modeler.
Also use local sizing in meshing.
Please check following videos
Ansys Meshing Sizing:
DM Share topology:
SpaceClaim Share topology:
Fluent Meshing Watertight Workflow:
Ansys Meshing: Decomposition for hex meshing:
Ansys Meshing: Meshing Methods:
Ansys Meshing: Inflation:
Regards,
Keyur
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