caa a22 4500 475737210 CHVBK 20180406123450.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1007/s007730070002 doi (NATIONALLICENCE)springer-10.1007/s007730070002 Kawamura Takafumi Ship Research Institute, 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan, JP aut Numerical investigation of turbulence near a sheared air-water interface. Part 2: Interaction of turbulent shear flow with surface waves [Elektronische Daten] [Takafumi Kawamura] Large-eddy simulations (LES) of the interactions between turbulent shear flow and surface waves are presented. The formation mechanism of Langmuir circulation and its contribution to the vertical momentum transport are investigated in detail. The effect of surface waves is modeled in two ways in the LES runs. One model includes only the phase-averaged effect of the waves as an added source term in the momentum equation, and the other model includes the full effect of the waves by use of the fully nonlinear conditions of the air-water interface. Langmuir circulations are clearly indicated in both cases, indicating that the phase-averaged effect is essential for the formation of this circulation. It is shown that the formation of Langmuir circulations enhances the vertical transport of momentum. As a result, the mean velocity gradient and the streamwise component of the turbulence intensity are decreased, while the spanwise and interface normal components are increased. Examination of the turbulence energy budget equations shows that production is due to the interaction between the vorticity and the Lagrangian drift as the phase-averaged effect of the wave becomes the dominant source of turbulence. The Society of Naval Architects of Japan, 2000 Key words Sheared air nationallicence water interface nationallicence Wind-waves nationallicence Langmuir circulation nationallicence Large eddy simulation nationallicence https://doi.org/10.1007/s007730070002 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s007730070002 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Kawamura Takafumi Ship Research Institute, 6-38-1 Shinkawa, Mitaka, Tokyo 181-0004, Japan, JP aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer