427 エッジトーン現象における秩序構造の三成分分解・エネルギー輸送方程式からの考察(S35-2 乱流渦構造(2),S35 乱流渦構造)  [in Japanese] 427 Study on the coherent structure in edge tone phenoenon from the point of energy transfer equation by using three decomposition  [in Japanese]

The flow field with an edgetone phenomenon induced by interaction between a two dimensional jet and a flat plate was experimentally explored by applying phase averaging technique and triple decomposition analysis. We define a coherent structure as the region where the absolute phase averaging periodic vorticity is larger than 0.15. The coherent structure formed at nozzle exit develops into downstream and then impinges on a tip of the flat plate. Addressing on Reynolds stress term and turbulent energy production term, we consider the role of coherent structure in the process of momentum and energy transport. The periodic Reynolds stress and production have a large value at same place where the coherent structure passes through. Based on this result, we assume that the rotation of coherent structure transports momentum. This process may increase the production term of periodic component.