Hello,

Im trying to simulate poiseuille flow and variate Reynolds number:

we have Re[sub]p[/sub]=U[sub]p[/sub]*H[sub]p[/sub]/nu[sub]p[/sub]= Reb=U[sub]b[/sub]*H[sub]b[/sub]/n[sub]b[/sub]

the index p means physics and b means boltzmann

for example for Re=50

Up[sub][/sub]=0.005m/s

H[sub]p[/sub]=0.01m

nu[sub]p[/sub]=10-6m²/s

for the Boltzmann case :

H[sub]b[/sub]=10

how to choose U[sub]b[/sub] and nu[sub]b[/sub]??

and when variate the reynolds number, i should variate U[sub]b[/sub] or nu[sub]b[/sub]??

Thank you

Hello,

this is similar to the question in this thread.

It is your choice. You have to select both in such a way that you obtain the correct Re and at the same time fulfill some LB requirements (e.g., velocity not too large, tau not too small etc.). Just go ahead, guess a value for tau (0.55, say) and complete the calculation. By the way, a channel width of 10 for Re = 50 seems a bit too small.

Timm