Surface wave interactions with submerged horizontal viscoelastic sheets

In this study, the surface wave interactions with submerged horizontal viscoelastic sheets of varying rheological properties are investigated both experimentally and analytically. In the experiments, we adopt the novel development in preparing finite length viscoelastic sheets with different rheolog...

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Main Authors: Sree, Dharma K. K., Mandal, Sourav, Law, Ardrian Wing-Keung
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/155889
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1558892022-03-26T20:11:32Z Surface wave interactions with submerged horizontal viscoelastic sheets Sree, Dharma K. K. Mandal, Sourav Law, Ardrian Wing-Keung School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Environmental Process Modelling Centre Engineering::Civil engineering Viscoelastic Submerged Sheet In this study, the surface wave interactions with submerged horizontal viscoelastic sheets of varying rheological properties are investigated both experimentally and analytically. In the experiments, we adopt the novel development in preparing finite length viscoelastic sheets with different rheological properties using oil-doped polydimethylsiloxane (PDMS) materials reported earlier in Sree et al. (2017, 2018). The wave interactions with the submerged viscoelastic sheets are quantified using ultrasonic sensors at different locations in terms of the reflection and transmission behavior. The experimental results show that the wave-sheet interactions are complex. The wave pattern at the submerged sheet region significantly depends on its rheological properties. For larger submergence, a standing wave pattern with primarily lower order modes develops along the sheet with a significant reduction of transmitted wave energy past the sheet region for shorter period waves. An almost complete cutoff (up to 99% reduction in wave energy transmission) occurs with the flexible sheet held close to the mean water level (MWL), while 50-90% reduction in wave energy transmission is recorded with the stiffer sheets. An analytical study is also carried out under the assumption of small amplitude water wave theory. The sheet is modeled based on the viscoelastic representation of the Voigt model and the analytical problem is solved using the domain matching technique. The profiles of surface wave as well as sheet displacement are well predicted by the analysis compared to the experimental measurements. However, the displacement amplitude is underestimated due to the fixed end conditions assumed. The predicted dispersion relation for the surface waves also agrees well with the experimental results for the shorter period waves, however larger discrepancies are observed with longer wave periods. In addition, the experimental results are up to one order of magnitude higher with respect to wave reflection. Thus, further improvement is needed in the future for the analysis to better represent the surface wave interactions with submerged viscoelastic sheets. Nanyang Technological University Submitted/Accepted version This research study is funded by the internal core funding from the Nanyang Environment and Water Research Institute (NEWRI), Nanyang Technological university. 2022-03-24T05:59:32Z 2022-03-24T05:59:32Z 2021 Journal Article Sree, D. K. K., Mandal, S. & Law, A. W. (2021). Surface wave interactions with submerged horizontal viscoelastic sheets. Applied Ocean Research, 107, 102483-. https://dx.doi.org/10.1016/j.apor.2020.102483 0141-1187 https://hdl.handle.net/10356/155889 10.1016/j.apor.2020.102483 2-s2.0-85098701517 107 102483 en Applied Ocean Research © 2020 Elsevier Ltd. All rights reserved. This paper was published in Applied Ocean Research and is made available with permission of Elsevier Ltd. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Viscoelastic
Submerged Sheet
spellingShingle Engineering::Civil engineering
Viscoelastic
Submerged Sheet
Sree, Dharma K. K.
Mandal, Sourav
Law, Ardrian Wing-Keung
Surface wave interactions with submerged horizontal viscoelastic sheets
description In this study, the surface wave interactions with submerged horizontal viscoelastic sheets of varying rheological properties are investigated both experimentally and analytically. In the experiments, we adopt the novel development in preparing finite length viscoelastic sheets with different rheological properties using oil-doped polydimethylsiloxane (PDMS) materials reported earlier in Sree et al. (2017, 2018). The wave interactions with the submerged viscoelastic sheets are quantified using ultrasonic sensors at different locations in terms of the reflection and transmission behavior. The experimental results show that the wave-sheet interactions are complex. The wave pattern at the submerged sheet region significantly depends on its rheological properties. For larger submergence, a standing wave pattern with primarily lower order modes develops along the sheet with a significant reduction of transmitted wave energy past the sheet region for shorter period waves. An almost complete cutoff (up to 99% reduction in wave energy transmission) occurs with the flexible sheet held close to the mean water level (MWL), while 50-90% reduction in wave energy transmission is recorded with the stiffer sheets. An analytical study is also carried out under the assumption of small amplitude water wave theory. The sheet is modeled based on the viscoelastic representation of the Voigt model and the analytical problem is solved using the domain matching technique. The profiles of surface wave as well as sheet displacement are well predicted by the analysis compared to the experimental measurements. However, the displacement amplitude is underestimated due to the fixed end conditions assumed. The predicted dispersion relation for the surface waves also agrees well with the experimental results for the shorter period waves, however larger discrepancies are observed with longer wave periods. In addition, the experimental results are up to one order of magnitude higher with respect to wave reflection. Thus, further improvement is needed in the future for the analysis to better represent the surface wave interactions with submerged viscoelastic sheets.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Sree, Dharma K. K.
Mandal, Sourav
Law, Ardrian Wing-Keung
format Article
author Sree, Dharma K. K.
Mandal, Sourav
Law, Ardrian Wing-Keung
author_sort Sree, Dharma K. K.
title Surface wave interactions with submerged horizontal viscoelastic sheets
title_short Surface wave interactions with submerged horizontal viscoelastic sheets
title_full Surface wave interactions with submerged horizontal viscoelastic sheets
title_fullStr Surface wave interactions with submerged horizontal viscoelastic sheets
title_full_unstemmed Surface wave interactions with submerged horizontal viscoelastic sheets
title_sort surface wave interactions with submerged horizontal viscoelastic sheets
publishDate 2022
url https://hdl.handle.net/10356/155889
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