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Lee, Jae Hwa
Flow Physics and Control Lab
Research Interests
  • Turbulent Flow Physics and Control
  • Incompressible and Compressible Flows
  • Fluid-Structure Interaction
  • Multi-Phase Flow with Heat Transfer

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A Direct Numerical Simulation Study on the very Large-Scale Motion in Turbulent Boundary Layer

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Title
A Direct Numerical Simulation Study on the very Large-Scale Motion in Turbulent Boundary Layer
Other Titles
A direct numerical simulation study on the very large-scale motion in tu rbulent boundary layer
Author
Sung, Hyung JinLee, Jae Hwa
Keywords
Very Large-Scale Motion(거대난류구조); Turbulent Boundary Layer(난류경계층)
Issue Date
2009-11
Publisher
대한기계학회
Citation
Transactions of the KSME, B, v.33, no.12, pp.977 - 982
Abstract
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
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ISSN
1226-4881
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