Momen, Mostafa and Bou-Zeid, Elie 2017. Analytical Reduced Models for the Non-stationary Diabatic Atmospheric Boundary Layer. Boundary-Layer Meteorology,
Momen, Mostafa and Bou-Zeid, Elie 2017. Mean and turbulence dynamics in unsteady Ekman boundary layers. Journal of Fluid Mechanics, Vol. 816, p. 209.
Li, Yin-Jun Chen, Jiang-Bo Zhou, Ji-Fu and Zhang, Qiang 2017. Large eddy simulation of boundary layer flow under cnoidal waves. Acta Mechanica Sinica, Vol. 32, Issue. 1, p. 22.
Momen, Mostafa and Bou-Zeid, Elie 2017. Large-Eddy Simulations and Damped-Oscillator Models of the Unsteady Ekman Boundary Layer. Journal of the Atmospheric Sciences, Vol. 73, Issue. 1, p. 25.
Ruan, Xiaozhou and Thompson, Andrew F. 2017. Bottom Boundary Potential Vorticity Injection from an Oscillating Flow: A PV Pump. Journal of Physical Oceanography, Vol. 46, Issue. 11, p. 3509.
Xu, Duo and Chen, Jun 2017. Subgrid-scale dynamics and model test in a turbulent stratified jet with coexistence of stable and unstable stratification. Journal of Turbulence, Vol. 17, Issue. 5, p. 443.
Alexander, Spencer R. and Hamlington, Peter E. 2017. Analysis of turbulent bending moments in tidal current boundary layers. Journal of Renewable and Sustainable Energy, Vol. 7, Issue. 6, p. 063118.
Bazilevs, Y. Korobenko, A. Yan, J. Pal, A. Gohari, S. M. I. and Sarkar, S. 2017. ALE–VMS formulation for stratified turbulent incompressible flows with applications. Mathematical Models and Methods in Applied Sciences, Vol. 25, Issue. 12, p. 2349.
Chalamalla, Vamsi K. and Sarkar, Sutanu 2017. Mixing, Dissipation Rate, and Their Overturn-Based Estimates in a Near-Bottom Turbulent Flow Driven by Internal Tides. Journal of Physical Oceanography, Vol. 45, Issue. 8, p. 1969.
Gayen, B. and Sarkar, S. 2017. PSI to turbulence during internal wave beam refraction through the upper ocean pycnocline. Geophysical Research Letters, Vol. 41, Issue. 24, p. 8953.
Gayen, Bishakhdatta Griffiths, Ross W. and Hughes, Graham O. 2017. Stability transitions and turbulence in horizontal convection. Journal of Fluid Mechanics, Vol. 751, p. 698.
Munroe, James R. and Sutherland, Bruce R. 2017. Internal wave energy radiated from a turbulent mixed layer. Physics of Fluids, Vol. 26, Issue. 9, p. 096604.
Abdilghanie, Ammar M. and Diamessis, Peter J. 2017. The internal gravity wave field emitted by a stably stratified turbulent wake. Journal of Fluid Mechanics, Vol. 720, p. 104.
Gayen, Bishakhdatta Hughes, Graham O. and Griffiths, Ross W. 2017. Completing the Mechanical Energy Pathways in Turbulent Rayleigh-Bénard Convection. Physical Review Letters, Vol. 111, Issue. 12,
Scalo, Carlo Piomelli, Ugo and Boegman, Leon 2017. Self-similar decay and mixing of a high-Schmidt-number passive scalar in an oscillating boundary layer in the intermittently turbulent regime. Journal of Fluid Mechanics, Vol. 726, p. 338.
Wakata, Yoshinobu 2017. Some properties of tidal currents estimated from analytical and LES simulation studies. Journal of Oceanography, Vol. 69, Issue. 6, p. 737.
Gayen, Bishakhdatta and Sarkar, Sutanu 2017. Negative turbulent production during flow reversal in a stratified oscillating boundary layer on a sloping bottom. Physics of Fluids, Vol. 23, Issue. 10, p. 101703.
Gayen, B. and Sarkar, S. 2017. Boundary mixing by density overturns in an internal tidal beam. Geophysical Research Letters, Vol. 38, Issue. 14, p. n/a.
GAYEN, BISHAKHDATTA and SARKAR, SUTANU 2017. Direct and large-eddy simulations of internal tide generation at a near-critical slope. Journal of Fluid Mechanics, Vol. 681, p. 48.
Johnston, T. M. Shaun Rudnick, Daniel L. Carter, Glenn S. Todd, Robert E. and Cole, Sylvia T. 2017. Internal tidal beams and mixing near Monterey Bay. Journal of Geophysical Research, Vol. 116, Issue. C3,
A numerical study based on large eddy simulation is performed to investigate a bottom boundary layer under an oscillating tidal current. The focus is on the boundary layer response to an external stratification. The thermal field shows a mixed layer that is separated from the external stratified fluid by a thermocline. The mixed layer grows slowly in time with an oscillatory modulation by the tidal flow. Stratification strongly affects the mean velocity profiles, boundary layer thickness and turbulence levels in the outer region although the effect on the near-bottom unstratified fluid is relatively mild. The turbulence is asymmetric between the accelerating and decelerating stages. The asymmetry is more pronounced with increasing stratification. There is an overshoot of the mean velocity in the outer layer; this jet is linked to the phase asymmetry of the Reynolds shear stress gradient by using the simulation data to examine the mean momentum equation. Depending on the height above the bottom, there is a lag of the maximum turbulent kinetic energy, dissipation and production with respect to the peak external velocity and the value of the lag is found to be influenced by the stratification. Flow instabilities and turbulence in the bottom boundary layer excite internal gravity waves that propagate away into the ambient. Unlike the steady case, the phase lines of the internal waves change direction during the tidal cycle and also from near to far field. The frequency spectrum of the propagating wave field is analysed and found to span a narrow band of frequencies clustered around 45°.
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