Lock-exchange flow regimes under low air Froude number bubble curtains
Abstract
The flow and density field characteristics around a bubble curtain in a laboratory scale lock-exchange setup are investigated using two-phase large-eddy simulations. We study the detailed hydrodynamics and show that there are three qualitatively distinct (sub)regimes within the previously classified breakthrough regime. The occurrence of these regimes depends not only on air Froude number that characterises the relative strength of the bubble curtain and the gravity current, but also on an additional non-dimensional parameter: the density ratio between the salt and fresh water. The dependence on this additional parameter is also observed in how effective bubble curtains are in blocking the transport of salt to the fresh part of the lock. Hence, it has important implications for the optimisation of bubble curtains in ship locks.
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BibTeX
@misc{raaghav2026lockexchange,
title = {{Lock-exchange flow regimes under low air Froude number bubble curtains}},
author = {Shravan K. R. Raaghav and Herman J. H. Clercx and Matias Duran-Matute},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.00960},
eprint = {2607.00960},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.00960},
}
RIS
TY - UNPB
TI - Lock-exchange flow regimes under low air Froude number bubble curtains
AU - Shravan K. R. Raaghav
AU - Herman J. H. Clercx
AU - Matias Duran-Matute
PY - 2026
DA - 2026/09/25
PB - arXiv
DO - 10.48550/arxiv.2607.00960
UR - https://arxiv.org/abs/2607.00960
AB - The flow and density field characteristics around a bubble curtain in a laboratory scale lock-exchange setup are investigated using two-phase large-eddy simulations. We study the detailed hydrodynamics and show that there are three qualitatively distinct (sub)regimes within the previously classified breakthrough regime. The occurrence of these regimes depends not only on air Froude number that characterises the relative strength of the bubble curtain and the gravity current, but also on an additional non-dimensional parameter: the density ratio between the salt and fresh water. The dependence on this additional parameter is also observed in how effective bubble curtains are in blocking the transport of salt to the fresh part of the lock. Hence, it has important implications for the optimisation of bubble curtains in ship locks.
ER -