Direct Numerical Simulation of Plane Couette Flow at a Transitional Reynolds Number : Fluids Engineering

概要

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Fully-developed plane Couette flow in the region of a transitional Reynolds number is simulated numerically, without any model which represents the effect of turbulence smaller than the size of computational grids. The upwind scheme proposed by Kawamura and Kuwahara is applied to the direct integration of the three-dimensional, time-dependent Navier-Stokes equation of motion. In this study, the procedure necessary to examine the equivalence of the numerical result to the real flow is considered, and the effect of numerical diffusivity of the upwind differencing is evaluated. From the numerical results, the outstanding features of low Reynolds number wall turbulence are discussed. Furthermore, a model of small scale turbulence in large-eddy simulation is also tested using the results of direct numerical simulation. It is inferred that the Smagorinsky model cannot be applied to the highly anisotropic turbulent shear flow of low Reynolds number without any modification.
一般社団法人日本機械学会の論文