A BEM model for wave forces on structures with thin porous elements.
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| Title: | A BEM model for wave forces on structures with thin porous elements. |
|---|---|
| Authors: | Mackay, Ed1 (AUTHOR) e.mackay@exeter.ac.uk, Liang, Hui2 (AUTHOR), Johanning, Lars1 (AUTHOR) |
| Source: | Journal of Fluids & Structures. Apr2021, Vol. 102, pN.PAG-N.PAG. 1p. |
| Subjects: | Wave forces, Pressure drop (Fluid dynamics), Boundary element methods, Analytical solutions, Taylor vortices |
| Abstract: | A boundary element method (BEM) model is presented for wave forces on structures composed of solid and porous surfaces, where the porous surface can be subject to either a linear or quadratic pressure–velocity relation. In the case of the quadratic relation, the solutions to the radiation and diffraction problems cannot be superimposed to obtain a solution for body motions in waves. Instead, a solution method is proposed which solves for the motion response and wave forces on the body simultaneously. Solutions for the radiation and diffraction problems are then obtained as special cases. Hydrodynamic identities and expressions for the mean drift force for combined solid-porous bodies are also derived. It is shown that in the case of a quadratic pressure drop, the hydrodynamic coefficients are no longer symmetric and the Haskind relation must be modified to account for the pressure drop across the porous surface. The BEM solution is verified against an analytical calculations and results for the excitation and mean drift forces are shown to agree well. A case study is presented for a floating truncated cylinder, with a concentric porous outer cylinder. It is shown that the porous outer cylinder significantly increases the damping at low frequencies, where wave radiation damping is low, leading to a lower motion response. • Solution for body motions in waves for bodies composed of solid and porous surfaces. • Solutions presented for both linear or quadratic pressure drop across porous surface. • BEM solution verified against analytical solution for fixed porous cylinders. • Porous surfaces shown to increase damping and reduce resonant motions. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Fluids & Structures is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 149474664 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A BEM model for wave forces on structures with thin porous elements. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mackay%2C+Ed%22">Mackay, Ed</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> e.mackay@exeter.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Liang%2C+Hui%22">Liang, Hui</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Johanning%2C+Lars%22">Johanning, Lars</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluids+%26+Structures%22">Journal of Fluids & Structures</searchLink>. Apr2021, Vol. 102, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Wave+forces%22">Wave forces</searchLink><br /><searchLink fieldCode="DE" term="%22Pressure+drop+%28Fluid+dynamics%29%22">Pressure drop (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+element+methods%22">Boundary element methods</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+solutions%22">Analytical solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Taylor+vortices%22">Taylor vortices</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A boundary element method (BEM) model is presented for wave forces on structures composed of solid and porous surfaces, where the porous surface can be subject to either a linear or quadratic pressure–velocity relation. In the case of the quadratic relation, the solutions to the radiation and diffraction problems cannot be superimposed to obtain a solution for body motions in waves. Instead, a solution method is proposed which solves for the motion response and wave forces on the body simultaneously. Solutions for the radiation and diffraction problems are then obtained as special cases. Hydrodynamic identities and expressions for the mean drift force for combined solid-porous bodies are also derived. It is shown that in the case of a quadratic pressure drop, the hydrodynamic coefficients are no longer symmetric and the Haskind relation must be modified to account for the pressure drop across the porous surface. The BEM solution is verified against an analytical calculations and results for the excitation and mean drift forces are shown to agree well. A case study is presented for a floating truncated cylinder, with a concentric porous outer cylinder. It is shown that the porous outer cylinder significantly increases the damping at low frequencies, where wave radiation damping is low, leading to a lower motion response. • Solution for body motions in waves for bodies composed of solid and porous surfaces. • Solutions presented for both linear or quadratic pressure drop across porous surface. • BEM solution verified against analytical solution for fixed porous cylinders. • Porous surfaces shown to increase damping and reduce resonant motions. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Fluids & Structures is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jfluidstructs.2021.103246 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Wave forces Type: general – SubjectFull: Pressure drop (Fluid dynamics) Type: general – SubjectFull: Boundary element methods Type: general – SubjectFull: Analytical solutions Type: general – SubjectFull: Taylor vortices Type: general Titles: – TitleFull: A BEM model for wave forces on structures with thin porous elements. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mackay, Ed – PersonEntity: Name: NameFull: Liang, Hui – PersonEntity: Name: NameFull: Johanning, Lars IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 08899746 Numbering: – Type: volume Value: 102 Titles: – TitleFull: Journal of Fluids & Structures Type: main |
| ResultId | 1 |
