A Comparative Study of the Lattice Boltzmann and Pseudo-Spectral Methods for Decaying Homogeneous Isotropic Turbulence
نویسندگان
چکیده
We compare the lattice Boltzmann method (LBM) and Pseudo-Spectral (PS) method for direct numerical simulation of decaying homogeneous isotropic turbulence. In this study we use the generalized lattice Boltzmann equation (GLBE) with multiple-relaxationtime (MRT) collision model, which overcomes all the apparent defects in the popular lattice BGK equation. We first compare the instantaneous flow field and they agree well with each other. We then compare the statistical quantities including the energy spectra, compensated spectra, skewness, flatness and so on. The LBM and SP results agree well with each other although the LBM results have oscillations due to the acoustics.
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