Suppression of transients in wave-excited response testing |
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| Institution: | 1. Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK;2. Centre for Offshore Research and Engineering, Department of Civil and Environmental Engineering, The National University of Singapore, No. 1 Engineering Drive 2, Singapore 117576;1. Chemistry Department, Faculty of Science, King Abdulaziz University, North Jeddah, P.O. Box 80203, Jeddah 21589, Saudi Arabia;2. Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt;3. Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt;4. Green Chemistry Department, National Research Centre, Dokki, Cairo 12622, Egypt;1. Amsterdam Institute for Molecules Medicines and Systems (AIMMS), Division of Medicinal Chemistry, Faculty of Sciences, VU University Amsterdam, Amsterdam, The Netherlands;2. Department of Biochemistry, University of Cambridge, Cambridge, UK;3. VU University Medical Center, Dept Radiology & Nuclear Medicine, Amsterdam, The Netherlands;1. Earth Sciences Faculty, Geography, Orel State University, Komsomolskaya Street 95, 302026 Orel, Russia;2. Institute of Geological Sciences, Palaeontology, Freie Universität Berlin, Malteserstr. 74-100, Building D, 12249 Berlin, Germany;3. Mainz Academy for Science, Humanities and Literature and GEOMAR, Kiel, Germany;4. Faculty of Geography, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia |
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| Abstract: | When a floating body in a wave tank has low hydrodynamic damping, for example in the heave mode, very long duration transient responses can arise if it is excited from a state of rest by sinusoidal waves. Such behaviour can be undesirable when steady state response characteristics are the object of investigation in a numerical tank, because of the consequential need for very long computations. The present paper develops a method for suppressing such transient behaviour in computational models. The success of the approach is demonstrated in the context of the heaving motion of a simple buoy. A linear model of such a buoy initially at rest in a wave tank, excited by propagating sinusoidal waves, is used here for a preliminary investigation of the removal of transients. The technique is then incorporated into a fully nonlinear potential flow simulation of the buoy, and the approach is shown to be effective. |
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| Keywords: | Floating body Wave tank experiments Numerical wave tank Transient response Suppression of transient Steady state response |
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