差分格子ボルツマン法による乱流計算に関する研究(流体工学,流体機械)

概要

論文の詳細を見る
Three-dimensional homogeneous isotropic turbulence are simulated by the Finite Difference Lattice Boltzmann Method (FDLBM). Firstly. We analyzed the characteristics of numerical viscosity of FDLBM, and we present a method that the numerical viscosity coincides with that of the Navier-Stokes based FDM. Secondly, we conducted simulations with the Smagorinsky Model. In the energy spectrum E(k) one detects the inertial range E(k)〜k^<-5/3> but the large k range presents a persistent energy tail, which has been found in the case of direct simulations by conventional lattice Boltzmann scheme too. This energy tail is shown to be due to generation of non-physical longitudinal noise. But for high Reynolds number flows this noise is shown to be negligibly small.
社団法人日本機械学会の論文
2007-03-25