Study on the Relation between Internal Wave Model and Kármán Vortex Street Model in a Wake

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  • 215 物体後流の内部波モデル表示と渦列モデル表示の関連
  • ブッタイ コウリュウ ノ ナイブハ モデル ヒョウジ ト ウズレツ モデル ヒ

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Abstract

The vortex street model proposed by Th.v.Kirmin Is a well known mathematical model for describing the unsteady wake Induced by a columnar body advancing with uniform velocity in a still fluid. Also, the growth and decay of microperturbation generated in the wake have been studied using the linearapporoximation model of a unsteady wake, as an object of application of the stability theeorem to the field of flow. Each of the two models are made up of different numerical expression for analyses of a same wake induced by a body, nevertheless little attention has been given to the relationship between them. On the assumption a perfect fluid and two-dimensional flow in the two models, this paper is intended as an Investigation of the relationship between the two models. It was found that although the mathmatical description of the two models are different, their qualitative characteristics in terms of the field of flow are very similar.

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