A modification of the values of three constants C1, C2 and C3 in the standard K-ɛ turbulence model is proposed, based on the experimentally obtained decay law of nearly homogeneous in-cylinder turbulence. Since the decay exponent of Reynolds numbers for in-cylinder turbulence is found to be different from that for steady ducted flow just behind a turbulence generating grid, the C2 value is modified first. Then C1 and C3 values are modified, because they depend on the C2 value. The derived C2 value of 1.40 is smaller than that in the standard K-ɛ turbulence model, but the C1 value of 1.40 is close to that of the standard one and the C3 value of -1.05 is very close to the recommended value for the case of unidirectional axial compression by Morel et al.
|ジャーナル||Transactions of the Japan Society of Mechanical Engineers Series B|
|出版ステータス||出版済み - 1987|
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