Hello
I have small question about the way how to calculate physical velocity from LBM results.
Namely, I used for this such a equation (the same which is used before LBM experiment to calculate dt_{psyh})
dt_{psyh} = u_{lb} * dx_{psyh} / u_{psyh}
But the problem appears when:

in one experiment I take as a reference velocity 2 (maximum velocity based in Poiseuille eq.)

and from LBM experiment I receive maximum lattice velocity 1.5

in second experiment I take as a reference velocity 1 (mean velocity based on Poiseuille eq.)

and from LBM experiment I receive maximum lattice velocity 0.74999
Taking into the account above equation it seems that in first example we receive 2 times quicker flow.
So,
I read in many places that this is only the reference velocity and the results should be the same (for example on this forum)
or
Does it mean that I calculate the u_{phys} in a wrong way?
Thanks for any help