Keyur Kanade
Ansys Employee

Please check geometry in SpaceClaim. 
Select geometry in structure tree --> Use right click --> Select Check Geometry. (Or Tools - Fault Detection in DM)
The geometry should be error free to proceed. 
If geometry has any errors, please modify/recreate geometry at those places. 

Please split the faces at that location and then check different sizes at that location. 

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v221/en/flu_ug/tgd_user_workflow_guided_tasks_setup_mesh_controls.html?q=curvature%20sizing

If this does not help, split the geometry around that location and try to mesh only that small part to come up with correct sizing or solution. 

Regards,

Keyur

How to access Ansys Online Help Document

Guidelines on the Student Community