Direct Numerical Simulation of Fully-Developed Turbulent Channel Flow Using the Lattice Boltzmann Method and Analysis of OpenMP Scalability

摘要

In this work, the lattice Boltzmann method (LBM) is verified for direct numerical simulation (DNS) of wall-bounded turbulent flows by simulating fully-developed turbulent channel flow and comparing the results to the spectral data of Moser et al. [3]. The turbulence statistics compared include: mean velocity and pressure profiles, Reynolds stress profiles, skewness and flatness factors, the turbulence kinetic-energy budget, and one-dimensional energy spectra. Additionally, a scalability test is performed for the implementation of the LBM parallelised with OpenMP for shared-memory architectures. The effect of the domain decomposition algorithm is studied by comparing the performance of a channel flow simulation decomposed with a naive decomposition method to a case in which the decomposition is computed using the METIS library [4].