직접수치모사를 이용한 난류경계층 내의 거대난류구조 연구 A Direct Numerical Simulation Study on the very Large-Scale Motion in Turbulent Boundary Layer

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 207
  • Download : 0
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 Reθ=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
2009-12
Language
Korean
Citation

대한기계학회논문집 B, v.33, no.12, pp.977 - 982

ISSN
1226-4881
URI
http://hdl.handle.net/10203/96448
Appears in Collection
ME-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0