once you mesh, please check orthogonal quality. the min orthogonal quality should be more than 0.1.
please go through help document which describes each inflation method. you can accordingly use the best method for you.
also as icemcfd is stopped, can you please mark this as 'is solution' and create new post for workbench meshing.
If this helps, please mark this post as 'Is Solution' to help others.
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