Please help regarding meshing
 

I am meshing wind turbine which is enclosed in cowl, also surrounded by high velocity air around it. I gave unstructured mesh to the cowl & turbine then for outer air domain i created a square domain around assembly of cowl & turbine & gave structured mesh to it. Now the question is what structured & unstructured mesh will get overlap with each other? & will give bad result? Please help, waiting eagerly for reply.:confused: