Question about U_{LB} in microfluidic applications??

Hi community,

At this moment I am working with Lattice Boltzmann in microfluidics.

At this field is not sensitive to the Reynolds number, as explained Krüger (in his book, page 282). For this problem, I am not know, what “velocity lattice Boltzmann ( U_{LB})” do to choose??

At others cases I can choose this velocity by mean Reynolds number, but at microfluidics I am not Know how.

Can someone help me with this aspect

Thank you for your help, time and collaboration