Abstract

The eigenfrequencies of the oscillations of an ideal liquid in a symmetric, shallow canal are investigated. The shape of the cross section is determined, for which thenth eigenfrequency becomes as large as possible, when the width and the wetted are length of the canal cross section are prescribed. This variational problem leads to a nonlinear eigenvalue problem for two functions. The problem is solved numerically, and, in addition, upper and lower bounds for the maximal eigenvalues are reported.

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