Why not take a circular surface of circles for make the Flow ? ;)

You can also take a concentred cluster of cylinders and make a little Boolean Diff ;)
Take a cylinder - View Right incline it as you want - Transform / Array / Circular as you want
Boolean Diff



If you want absolutly a square grid of Cylinders or any special gride
- draw a vertical line at the center (or any place following your wishes) to a top
- Draw your grid of lines from ground to top
- Draw a vertical cylinder at the center
- Transform / Orient / Line-Line none Copy enable
so copy your original cylinder along the lines on quarter or half quarter of the grid (very easy ! )
- then some Mirrors Symmetry
and Boolean Diff as above
All that take 1 minute :)



Maybe there are more tricky things for Orient a grid of vertical cylinders (or any objects) to a single point in one move ? (Script ? ) ;)