Experimental Verification of Formulae for Natural Seiche Frequencies in a Two-layer Fluid with the Free Surface

Abstract

Theoretical formulae for the natural frequencies of oscillations of a two-layer fluid due to surface and interface seiches are experimentally tested. It is shown that the formulae based on the strict dispersion relation of the linear theory of the potential motion are applicable in a wide range of the natural frequencies. The approximate formulae based on the long-wave approximation are also applicable but in a narrower frequency range, which is particularly typical for the natural seiches.