Stratified flow over topography: Models versus observations
Date of Original Version
Essential mechanisms identified in the authors' observations of flow establishment over topography are restated, with emphasis on those which are at variance with numerical simulations. Specifically, small-scale instabilities were observed to lead to upwards transport of fluid from the primary flow so as to form a nearly stationary intermediate layer, and boundary-layer separation significantly delays establishment of the downslope flow. Simulations that force the streamlines to follow the topography generate a large-amplitude breaking wave, which we did not observe. Our observations show that small-scale instability and separation act in concert to determine the time-dependent evolution of the stratified flow response.
Publication Title, e.g., Journal
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Farmer, D. M., and L. Armi. "Stratified flow over topography: Models versus observations." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 457, 2016 (2001). doi: 10.1098/rspa.2001.0802.