Journal of Fluid Science and Technology
Online ISSN : 1880-5558
ISSN-L : 1880-5558
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A Study of Turbulence Simulations Using Finite Difference Lattice Boltzmann Method
Daisuke OSHIMAMichihisa TSUTAHARASatoshi MIZUTANI
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2007 Volume 2 Issue 3 Pages 582-591

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Abstract

Three-dimensional homogeneous isotropic turbulence is simulated using the finite difference lattice Boltzmann method (FDLBM). First, we analyze the characteristics of numerical viscosity of FDLBM, and present a method in which the numerical viscosity coincides with that of the Navier-Stokes based FDM. Second, we conducted simulations with the Smagorinsky model. In the energy spectrum E(k) one detects the inertial range E(k) ∼k-5/3; however, the large k range presents a persistent energy “tail,” which has also been found in direct simulations using conventional lattice Boltzmann scheme. This energy “tail” is is due to generation of non-physical longitudinal noise. However, for high Reynolds number flows this noise is shown to be negligible.

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© 2007 by The Japan Society of Mechanical Engineers
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