Flow Analysis

Hi everyone,
I am trying to do flow analysis. In the code I created, I need to define the surfaces one by one to achieve the result I want (reference 1.png). When I define all surfaces at once, I get a result as in 2.png. However, I want to get a result like in 1.png. Although the 1st and 2nd images are similar to each other, the number of points in the 2nd image is more on a single surface. I Don’t want this. With different surface shapes, this becomes more complex.
Thanks in advance.

flow.gh (36.7 KB)