[whitefield]

first of all sorry for my English. my local language is not English so my words can be odd.

I'm working on a 2D confined cylinder(blockage ratio 1/3) in the Poiseuille channel flow.

my lab use Re base on the channel averaged velocity and the cylinder diameter.

but some papers use Re based on channel centerline velocity and the cylinder diameter.

If i use Re=100, do i have to compare drag coefficient with Re=150 base on the channel centrline velocity?

[FMDenaro]

Originally Posted by whitefield

first of all sorry for my English. my local language is not English so my words can be odd.

I'm working on a 2D confined cylinder(blockage ratio 1/3) in the Poiseuille channel flow.

my lab use Re base on the channel averaged velocity and the cylinder diameter.

but some papers use Re based on channel centerline velocity and the cylinder diameter.

If i use Re=100, do i have to compare drag coefficient with Re=150 base on the channel centrline velocity?

Yes, for the Poiseulle flow you have the relation u_cent = 1.5 u_av. Just ensure to be congruent in the comparison