Change timestep-size in LBM


In all LBM-implementations I have seen, the timestep dt is set to 1, dt=1. However, how do I use an arbitrary value of dt>0?

What do I have to do explicitly? Take as an example the matlab-examples on this site:

Thanks in advance.

It is true that in most LBM codes, the time step is constant and equal to unity. However, this does not mean that the time step in LBM is always 1 second. This is a problem of unit conversion, you have to convert the timestep in LBM (dt_LBM=1) to the time step in real physical units dt_physical = ??? seconds.
I advise you to read this link: unit conversion