Nikhil Narale
Ansys Employee

For getting accurate results, it is very critical to have a mesh with good resolution and quality, at least near to the object of your interest. I would suggest you to look for aero meshing tutorials (airfoil for that matter) on the internet. 

Also, keep a keen eye on the y+ value and make sure to maintain it as per the best practice. To know more, check this: 4.18.1. Overview (ansys.com)

If you are not able to access the link, please refer to this forum discussion: Using Help with links (ansys.com)

 

Nikhil