Two-layer conjugate flows in an open channel
Abstract
We investigate conjugate flows in a two-layer fluid system with a flat bottom and a free surface. These are up- and downstream states consistent with simultaneous conservation of mass, momentum, and energy; and therefore candidate end-states of one-dimensional dissipationless bores. By choosing variables in a specific way, we are able to explicitly parameterize all physical non-trivial conjugate flows in the system, using only rational functions. This two-parameter family can be categorized according to whether the states are compatible with (1) a rising surface, and falling internal interface; or (2) vice versa. In particular, we rule out the existence of monotone bore solutions, consistent with an earlier result due to Chen, Walsh, and Wheeler. However, here we do so already at the level of conjugate flows. Separating these two distinct categories is a one-parameter family of critical trivial conjugate flows. The complete description obtained in the present paper serves as an important stepping stone towards finding actual realizing heteroclinic orbits connecting such conjugate states.
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BibTeX
@misc{chen2026twolayer,
title = {{Two-layer conjugate flows in an open channel}},
author = {Robin Ming Chen and Kristoffer Varholm and Annie Grace Wang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.36242},
eprint = {2610.36242},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.36242},
}
RIS
TY - UNPB
TI - Two-layer conjugate flows in an open channel
AU - Robin Ming Chen
AU - Kristoffer Varholm
AU - Annie Grace Wang
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.36242
UR - https://arxiv.org/abs/2610.36242
AB - We investigate conjugate flows in a two-layer fluid system with a flat bottom and a free surface. These are up- and downstream states consistent with simultaneous conservation of mass, momentum, and energy; and therefore candidate end-states of one-dimensional dissipationless bores. By choosing variables in a specific way, we are able to explicitly parameterize all physical non-trivial conjugate flows in the system, using only rational functions. This two-parameter family can be categorized according to whether the states are compatible with (1) a rising surface, and falling internal interface; or (2) vice versa. In particular, we rule out the existence of monotone bore solutions, consistent with an earlier result due to Chen, Walsh, and Wheeler. However, here we do so already at the level of conjugate flows. Separating these two distinct categories is a one-parameter family of critical trivial conjugate flows. The complete description obtained in the present paper serves as an important stepping stone towards finding actual realizing heteroclinic orbits connecting such conjugate states.
ER -