Examination of the Initial Field Dependence of the Decay Exponent Value of Decaying Turbulence using a Large-Eddy Simulation and a Wind Tunnel Experiment

抄録

This study aims to clarify the robustness of a value of a decay exponent. This parameter characterizes the decay characteristics of grid-generated turbulence obtained using a wind tunnel experiment and a numerical simulation. Here, largeeddy simulation is used as the numerical analysis in this study. Decay characteristics of the isotopically decaying turbulence are compared with those of the grid turbulence reproduced in the wind tunnel experiment. Main results of this study are that the values of the decay exponent for grid turbulence are obtained after compensating for the negligible wind tunnel blockage effect, that homogeneous isotropic turbulence is reproduced using large-eddy simulation with a value of the decay exponent that is close to the experimentally measured value of the decay exponent, and that the effects of anisotropy and Reynolds stress obtained in this study using LES are not significant.