Chapter
Dec 31, 2015
Hydrodynamic Forces on a Circular Cylinder Due to Combined Wave and Current Loading
Authors: Yuichi Iwagaki and Toshiyuki AsanoAuthor Affiliations
Publication: Coastal Engineering 1984
Abstract
The hydrodynamic force acting on a circular cylinder in a wavecurrent co-existing field and its generating mechanism are discussed. This study focuses on the asymmetries of both the water particle movement and the resultant vortex property with respect to the cylinder, which produce inherent characteristics in the hydrodynamic forces in the wave-current co-existing field.
First of all, the vortex property around a circular cylinder in the wave-adverse current co-existing field has been examined by flow visualization tests. It has been found that the vortex property depends on the flow characteristics around the trough phase when the wave-current composite velocity becomes maximum and can be represented with a newly proposed K.C. number for the co-existing field.
Secondly, the characteristics of the in-line force has been made clear by evaluating the drag coefficient and the mass coefficient in the expanded Morison’s equation for the co-existing field. These coefficients can be well arranged by , which is one of the newly proposed K.C. numbers, and their characteristics coincide with the existing results in the wave only field. The in-line hydrodynamic force in the co-existing field can be explained sufficiently by considering the vortex property in the same manner as clarified in the wave only field.
Thirdly, the characteristics of the transverse force (lift force) are discussed in connection with the vortex properties. It has also been found that the fluctuating frequency of the lift force is synchronized with the loading wave frequency.
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Published In
Coastal Engineering 1984
Pages: 2857 - 2874
Copyright
© 1985 American Society of Civil Engineers.
History
Published online: Dec 31, 2015
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Affiliations
Yuichi Iwagaki
Professor, Dept. of Civil Eng., Kyoto University, M. of ASCE
Toshiyuki Asano
Research Associate, Dept. of Civil Eng., Kyoto University Yoshida-honmachi, Sakyo-ku, Kyoto 606 Japan
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