Measurements of the dissipation coefficient at the wavemaker in the process of generation of the resonant standing waves in a tank

L. Shemer, M. Chamesse, E. Kit

Research output: Contribution to journalArticlepeer-review

Abstract

The complex dissipation at the wavemaker used for direct excitation of nonlinear standing waves in the vicinity of the cut-off frequency, is measured experimentally. The results indicate that the absolute value of this dissipation coefficient exceeds significantly the estimate based on purely viscous dissipation. This is attributed to the turbulent effects resulting from the vortex shedding at the discontinuities of the wavemaker surface. It is shown that incorporation of this dissipation in the boundary condition at the wavemaker as a nonlinear term in a form generally used to describe dissipation in a turbulent boundary layer, is more appropriate allowing to remove hysteresis in the value of the wavemaker dissipation coefficient. Such hysteresis is observed when a linear dissipation model is applied.

Original languageEnglish
Pages (from-to)506-512
Number of pages7
JournalExperiments in Fluids
Volume7
Issue number8
DOIs
StatePublished - Sep 1989

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