Change timestep-size in LBM

Lattice Boltzmann Method LBM: Theory
#1

Hi

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: http://wiki.palabos.org/numerics:matlab_samples

Thanks in advance.

#2

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