Vortex shedding and roll damping for hulls with rounded bilges

Ian A. Milne, Feifei Tong, J. R.Michael Graham

Research output: Chapter in Book/Conference paperConference paper

Abstract

Vortex shedding and eddy generation can provide a substantial contribution to the hydrodynamic roll damping of vessels. While sharp-edge bilge geometries generally result in greater damping, a more rounded bilge may be beneficial for the other ship motions and mooring design. To this end, the effect of the bilge rounding on the vortex shedding dynamics and the hydrodynamic damping of hulls is investigated numerically. A series of new computations of the response of hulls with differing bilge radii and subject to forced oscillatory motion are reported. The severity of the vortex shedding and the magnitude of the damping is shown to depend strongly on the bilge geometry. Computations using an efficient isolated edge discrete vortex model are also found to be generally in qualitative agreement with the CFD results. The results extend the relatively scarce literature on the effect of bilge rounding and can assist in informing hull design and concept selection.

Original languageEnglish
Title of host publicationOcean Engineering
PublisherThe American Society of Mechanical Engineers (ASME)
Volume7A-2019
ISBN (Electronic)9780791858844
DOIs
Publication statusPublished - 11 Nov 2019
EventASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019 - Glasgow, United Kingdom
Duration: 9 Jun 201914 Jun 2019

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Volume7A-2019

Conference

ConferenceASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019
CountryUnited Kingdom
CityGlasgow
Period9/06/1914/06/19

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  • Cite this

    Milne, I. A., Tong, F., & Graham, J. R. M. (2019). Vortex shedding and roll damping for hulls with rounded bilges. In Ocean Engineering (Vol. 7A-2019). [V07AT06A021] (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE; Vol. 7A-2019). The American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/OMAE2019-95629