Bulletin of the American Physical Society
75th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 20–22, 2022; Indiana Convention Center, Indianapolis, Indiana.
Session U33: Geophysical Fluid Dynamics: Atmospheric Boundary Layers
8:00 AM–10:36 AM,
Tuesday, November 22, 2022
Chair: Andrew Banko, United States Military Academy
Abstract: U33.00011 : Unsteady land-sea breeze circulations in the presence of a synoptic pressure forcing*
10:10 AM–10:23 AM
Elie R Bou-Zeid
Elie R Bou-Zeid
Mohammad H Allouche
Large eddy simulations varying these two non-dimensional parameters show asymmetry in the dynamics when the geostrophic wind is oriented from sea to land, versus land to sea. The steady state circulations indicate four regimes depending on Ri and α, varying from the canonical LSB circulation at high Ri, to a complete absence of LSB at low Ri, but only when the synoptic flows are blowing from sea to land. The unsteady simulations depict added complexities as the land-sea surface temperature difference, the mean flow, and the turbulence are found to be consistently out of equilibrium. We analyze the flow and turbulence hysteresis for these non-equilibrium conditions.
The findings are particularly relevant for the accelerating deployment of offshore wind energy, as well as for predicting pollution ventilation and urban heat island dynamics of coastal cities.
*The National Science Foundation through the Physical and Dynamic Meteorology program, grant number 2128345
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