simulation of different fluids

Lattice Boltzmann Method LBM: Theory
#1

Hello,

I want to simulate 2D flow of two different fluids (water and HC) under the same pressure drop. The domain and every other flow parameters are the same,…(omega, Re, resolution), which means that all the parameters in LU are the same. In reality, I do not expect the velocities to be the same because of differences in viscosity. I am wondering what parameter in the LBM simulation will generate unique velocities for the different fluids.

Thanks

#2

Hi,

If the relaxation parameter omega (which represents the viscosity, measured in lattice units), the Reynolds number and the resolution are identical in both flows, then the only way to make a difference is to vary the value of the characteristic velocity U, as measured in lattice units. This amounts to varying the discrete time step dt.

Have you read the LBMethod.org document on unit conversions?