Hi @melvina,
Thanks for reach out to us! Could you please share your project link with me? Just to take a close look at your particular issue with meshing parameters.
In this meantime, I would suggest you to take a look at some refinement options in this tutorial. There you will find a step-by-step approach to setup a local element size refinement, a region refinement, changing global fineness of your mesh, inflate boundary layers, and other kind of supportive informations that I assure will help you a lot.
Please let me know if it is useful, I’ll be waiting for your project link 
Best,
Vinícius
EDIT1: Link was not working (solved).