About Multiblock setup
 

I want to compute a foil in water tunnel. I want to make a C-grid of it. So I devide two block of it: one is front area and the other is rear area. However, I can't keep the grids continual between these two block though the boundary. Although I chose the same ratio and spacing.

Maybe anybody has better method to build a C-grid?

How can I do with it ? Thanks in advance!