I have a cylinder diameter d in a channel width b. Flow is U say and kinematic viscosity .
I understand the Reynolds number to be based on the channel width so
and the Cylindrical Reynolds number based on the cylinder diameter
But if I were to have two cylinders next to each other would the Reynolds be the same or now calculated with 2d ?
I'm unsure which it would be and why if anyone could help me out?
Thanks,
James