unit conversion D2Q9 VS D3Q19

Lattice Boltzmann Method LBM: Theory
#1

Hello
Does somebody know if there are any difference between D2Q9 and D3Q19 in the algorithm of units’ convertion ?
I think that no, but above question is a reason of different results that I received in simulation even in simple tube when I compare physical velocity coming from LBM with velocity calculated directly from Poiseuille equation.

Thanks

#2

The unit conversions are the same. This of course can only be valid if the two simulations are “comparable”, e.g., using D3Q19 with z-extension = 1.