When Re=160, velocity=0.048, viscosity=0.06,l=20 the program is right, how can I change Re?

Hi everyone,
I’m learning LBM now. But I’m struggling with it. I made a program about floiw past a square cylinder. When I made the Re=160, velocity=0.048, viscosity=0.06,l=20, the results is right. But when I want to compute other cases like Re=50, should I change the viscosity or change the velocity ? And how can I change them? Thank you for any information! Thank you!!!


You can change either viscosity(nu) or the velocity (U) as long as you maintain consistency with required Re=U*l/nu