Title: Experimental evaluation of the k-ε turbulence model in numerical simulation of in-cylinder air motion

Authors: Y. Moriyoshi, H. Kobayashi, T. Kamimoto

Addresses: Department of Mechanical Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguru-ku, Tokyo 152, Japan. ' Department of Mechanical Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguru-ku, Tokyo 152, Japan. ' Department of Mechanical Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguru-ku, Tokyo 152, Japan

Abstract: In a previous report, it was revealed that the k-ε turbulence model, which assumes an isotropic eddy viscosity, was not appropriate for the prediction of an anisotropic in-cylinder flow field. In this article, the k-ε turbulence model is modified so as to be applicable to the anisotropic in-cylinder flow, using a flux Richardson number which represents the effect of anisotropy of turbulence on turbulent diffusivity. A comparison between the prediction and the experimental data, obtained by an LDV system using a transparent cylinder engine, shows that the modified k-ε turbulence model allows successful prediction of the mean flow field but little improvement regarding the turbulence field.

Keywords: anisotropy; cutoff frequency; turbulence modelling; LDV system; in-cylinder flow; turbulent diffusivity.

DOI: 10.1504/IJVD.1989.061552

International Journal of Vehicle Design, 1989 Vol.10 No.5, pp.598 - 608

Published online: 26 May 2014 *

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