A simple question

Lattice Boltzmann Method LBM: Theory
#1

I was working on the simulation of a flute using LBM, therefore i was simulating “air”, a compressible fluid, but the computational cost was too large ( 2400x750 lattice size to ensure stability of the BGK model ). So I change my objectives, and i want to validate the model that i have with some physical data, but the data that i collect was using water (There’s no equipment to get data from gases), a incompressible fluid. So at the start of the BGK-LBM the density is calculed.

Should I ommit that step, and leave the density constant?

I know that this is a trivial and basic question, but i didn’t find anything about that on Wolf-Gladow neither on Sukop.

Thanks for your time

Spartan

#2

No, you can’t omit this step. The density must be computed anyway, because it is used to reflect pressure variations. Your question is answered in-depth in the answer to Kaff’s question.

#3

Thanks Jlatt,