Eulerian and Lagrangian statistics in stably stratified turbulent channel flows Export

@article{Yeo:2009, abstract = {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.}, author = {Yeo, Kyongmin and Kim, Byung-Gu and Lee, Changhoon}, citeulike-article-id = {5846947}, citeulike-linkout-0 = {http://dx.doi.org/10.1080/14685240902902365}, doi = {10.1080/14685240902902365}, journal = {Journal of Turbulence}, keywords = {channel, eulerian, lagrangian, stratification}, pages = {N17+}, posted-at = {2009-09-28 13:31:27}, priority = {2}, publisher = {Taylor \& Francis}, title = {Eulerian and Lagrangian statistics in stably stratified turbulent channel flows}, url = {http://dx.doi.org/10.1080/14685240902902365}, volume = {10}, year = {2009} }

TY - JOUR ID - Yeo:2009 L3 - citeulike-article-id:5846947 N2 - 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. JF - Journal of Turbulence TI - Eulerian and Lagrangian statistics in stably stratified turbulent channel flows PB - Taylor & Francis VL - 10 SP - N17 KW - channel KW - eulerian KW - lagrangian KW - stratification AU - Yeo, Kyongmin AU - Kim, Byung-Gu AU - Lee, Changhoon PY - 2009/// UR - http://dx.doi.org/10.1080/14685240902902365 ER -