직접수치모사를 이용한 난류경계층 내의 거대난류구조 연구Streamwise-Coherence of Hairpin Packet Motions in Turbulent Boundary Layer

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Direct numerical simulation (DNS) of a turbulent boundary layer with moderate Reynolds number was performed to scrutinize streamwise-coherence of hairpin packet motions. The Reynolds number based on the momentum thickness (θin) and free-stream velocity (U,) was varied in the range Re₀=1410~2540 which was higher than the previous numerical simulations in the turbulent boundary layer. In order to include the groups of hairpin packets existing in the outer layer, large computational domain was used (more than 50δo, where δo is the boundary layer thickness at the inlet in the streamwise domain). Characteristics of packet motions were investigated by using instantaneous flow fields, two-point correlation and conditional average flow fields in xy-plane. The present results showed that a train of hairpin packet motions was propagating coherently along the downstream and these structures induced the very large-scale motions in the turbulent boundary layer.
Publisher
대한기계학회
Issue Date
2009-05-20
Language
KOR
Citation

대한기계학회 2009년도 유체공학부문 춘계학술대회, pp.253 - 258

URI
http://hdl.handle.net/10203/162295
Appears in Collection
ME-Conference Papers(학술회의논문)

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