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An Isoperimetric Sloshing Problem in a Shallow Container with Surface Tension

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Abstract

In 1965, B. A. Troesch solved the isoperimetric sloshing problem of determining the container shape that maximizes the fundamental sloshing frequency among two classes of shallow containers: symmetric canals with a given free surface width and cross-sectional area, and radially symmetric containers with a given rim radius and volume (Commun Pure Appl Math 18(1–2):319–338, 1965, https://doi.org/10.1002/cpa.3160180124). Here, we extend these results in two ways: (i) we consider surface tension effects on the fluid free surface, assuming a flat equilibrium free surface together with a pinned contact line, and (ii) we consider sinusoidal waves traveling along the canal with wavenumber \(\alpha \ge 0\) and spatial period \(2\pi /\alpha \); two-dimensional sloshing corresponds to the case \(\alpha = 0\). Generalizing our recent variational characterization of fluid sloshing with surface tension to the case of a pinned contact line, we derive the pinned-edge linear shallow sloshing problem, which is an eigenvalue problem for a generalized Sturm-Liouville system. In the case without surface tension, we show that the optimal shallow canal is a rectangular canal for any \(\alpha > 0\). In the presence of surface tension, we solve for the maximizing cross-section explicitly for shallow canals with any given \(\alpha \ge 0\) and shallow radially symmetric containers with m azimuthal nodal lines, \(m = 0, 1\). Our results reveal that the squared maximal sloshing frequency increases considerably as surface tension increases. Interestingly, both the optimal shallow canal for \(\alpha = 0\) and the optimal shallow radially symmetric container are not convex. As a consequence of our explicit solutions, we establish convergence of the maximizing cross-sections, as surface tension vanishes, to the maximizing cross-sections without surface tension.

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Acknowledgements

We would like to thank Emma Coates, Emily Dryden, Calvin Khor, Robert Viator, and Nathan Willis for stimulating discussions. We are also grateful to the referees for their valuable comments and suggestions which greatly improved the manuscript.

Funding

The work of C. H. Tan and B. Osting was partially funded by NSF DMS 17-52202.

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Correspondence to Braxton Osting.

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Tan, C.H., Hohenegger, C. & Osting, B. An Isoperimetric Sloshing Problem in a Shallow Container with Surface Tension. Appl Math Optim 87, 33 (2023). https://doi.org/10.1007/s00245-022-09936-2

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