1905 Snapshot POD法による噴流の構造解析(S21-1 噴流,後流及びはく離流れの流動解析と応用(1),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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In order to construct a low dimensional model for a round jet, fundamental properties of low-order mode are investigated. Based on the data of flow field provided with the DNS(direct numerical simulation) of a round jet, the flow field is decomposed into each mode using the snapshot POD(proper orthogonal decomposition) method. The energetic modes, i.e., 1st to 5th mode demonstrates similar spatial structures and intermittently appears accompanying a phase shift with each other. Namely it is suggested that the construction of low dimensional modes needs a certain number of modes compared to the previous-investigated simple flow, e.g., 2D cavity flow or, he flow around a circular cylinder. Further it is found that the energetic mode well represents the large-scale structures existing downstream compared to the instanteneou flow field.
社団法人日本機械学会の論文
2008-08-02