AM05-12-018 回転流路内乱流の構造変化とレイノルズ応力テンソルの関係について(乱流渦構造4,一般講演)

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The direct numerical simulation of turbulent flow in a rotating channel is executed. Especially, We discuss relations between the second and third invariants of Reynolds stress tensor and alteration of vortical structures in the channel. In this study, some different rotation numbers are tested, and both transient states -after the onset of rotation- and fully-developed states are investigated. In case of fully-developed states, three-dimensionality of flow is enhanced on the pressure side in proportion to the increases in the rotation number, and the flow indicates two-dimensionality on the suction side. At a transient state, the flows denote the same tendencies of those of fully developed state. In case of high rotation number, however, turbulence states become unstable on the suction side.
2005-09-05