TY - GEN
T1 - High resolution DNS of shear-convective turbulence and its implications to second-order parameterization
AU - Tse, K. L.
AU - Mahalov, Alex
AU - Nicolaenko, B.
AU - Joseph, B.
PY - 2003
Y1 - 2003
N2 - High resolution 3D direct numerical simulation (DNS) of a model tropopause jet, with an underlying convectively unstable layer, is performed. We obtain quasi-equilibrium turbulent dataset, in which the budgets are nearly balanced. Vertical profiles of turbulence statistics and budgets are presented. Using this DNS dataset, we evaluate the performance of some popular models used in second-order closure of turbulence. To our knowledge, this is first time that such a study is conducted for turbulence under the combined influence of shear and convection. From this quasi-equilibrium dataset, we unambigously identify layers of countergradient momentum and heat fluxes which occur near regions of penetrative convection. These are also regions where conventional second-order closure models fail.
AB - High resolution 3D direct numerical simulation (DNS) of a model tropopause jet, with an underlying convectively unstable layer, is performed. We obtain quasi-equilibrium turbulent dataset, in which the budgets are nearly balanced. Vertical profiles of turbulence statistics and budgets are presented. Using this DNS dataset, we evaluate the performance of some popular models used in second-order closure of turbulence. To our knowledge, this is first time that such a study is conducted for turbulence under the combined influence of shear and convection. From this quasi-equilibrium dataset, we unambigously identify layers of countergradient momentum and heat fluxes which occur near regions of penetrative convection. These are also regions where conventional second-order closure models fail.
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U2 - 10.1115/fedsm2003-45333
DO - 10.1115/fedsm2003-45333
M3 - Conference contribution
AN - SCOPUS:0346273757
SN - 0791836967
SN - 9780791836965
T3 - Proceedings of the ASME/JSME Joint Fluids Engineering Conference
SP - 1877
EP - 1885
BT - Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference
A2 - Ogut, A.
A2 - Tsuji, Y.
A2 - Kawahashi, M.
PB - American Society of Mechanical Engineers
T2 - 4th ASME/JSME Joint Fluids Engineering Conference
Y2 - 6 July 2003 through 10 July 2003
ER -