Journal
JOURNAL OF TURBULENCE
Volume 10, Issue 17, Pages -Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14685240902902365
Keywords
stable stratification; turbulent channel flow; Lagrangian statistics; direct numerical simulation
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Funding
- Yonam Foundation
- Korea Science and Engineering Foundation [R01-2008-000-10664-0]
- WCU Project
- KISTI Supercomputing Center in Korea
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Using direct numerical simulation, we investigate the Eulerian and Lagrangian characteristics of the near-wall turbulence under stable stratification. In the near-wall region, large-scale motions are suppressed by stable stratification, while small-scale motions are enhanced, which leads to the increase of intermittency. It is shown that the modification of the Reynolds shear stress is caused by the increased intermittency and anisotropy. Investigation of acceleration and vorticity reveals that the length scales and timescales of the near-wall coherent vortices are reduced by stratification. The role of baroclinic torque around the near-wall turbulent structures is also discussed. The Lagrangian statistics indicate that the scaled dispersion in the streamwise direction remains unchanged, while those in the spanwise as well as in the wall-normal direction are suppressed by stratification.
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