NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION

Iro Malefaki; Angeliki Karperaki; Kostas Belibassakis

doi:10.1115/OMAE2022-79699

NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION

Iro Malefaki, Angeliki Karperaki, Kostas Belibassakis

Research output: Chapter in Book/Published conference output › Conference publication

Abstract

In the present work, we focus on noise generation by a flapping foil used for small ship and AUV propulsion and its propagation in the inhomogeneous sea environment. The pressure field and the forces produced by flapping thruster motion, obtained by a BEM model, are used to calculate the dipole and monopole terms associated with the initial – boundary value problem governed by the wave equation. Initially, an acoustic model in free space based on the Farassat formulation is derived. Subsequently, the latter is extended to account for a bounded domain and an inhomogeneous medium. For simplicity, the 2D sea acoustic waveguide is considered, and the presented numerical method is based on a Finite Difference scheme (FDM), incorporating free-surface and seabed effects as well as a variable sound speed profile. Moreover, the numerical scheme is supplemented by a perfectly matched layer (PML) for the treatment of the outgoing radiating field behavior in the open boundaries. Numerical results are presented for the verification of the present method in the case of time-harmonic sources. Future extensions are discussed regarding the application of a Finite Element Method (FEM) – PML scheme to treat localized scatterers and curved boundaries as well as 3D effects.

Original language	English
Title of host publication	Ocean Engineering; Honoring Symposium for Professor Gunther F. Clauss on Hydrodynamics and Ocean Engineering
Publisher	American Society of Mechanical Engineers(ASME)
Number of pages	8
Volume	5B
ISBN (Electronic)	9780791885901
DOIs	https://doi.org/10.1115/OMAE2022-79699
Publication status	E-pub ahead of print - 13 Oct 2022
Event	ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022 - Hamburg, Germany Duration: 5 Jun 2022 → 10 Jun 2022

Publication series

Name	Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Volume	5-B

Conference

Conference	ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022
Country/Territory	Germany
City	Hamburg
Period	5/06/22 → 10/06/22

Bibliographical note

Funding Information:
The present work has been supported by Seatech H2020 project received funding from the European Union’s Horizon 2020 research and innovation program under the grant agreement No 857840. The opinions expressed in this document reflect only the author’s view and in no way reflect the European Commission’s opinions. The European Commission is not responsible for any use that may be made of the information it contains.

Keywords

FDM-PML model
flapping thruster
noise propagation
sea environment

Access to Document

10.1115/OMAE2022-79699

Cite this

Malefaki, I., Karperaki, A., & Belibassakis, K. (2022). NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION. In Ocean Engineering; Honoring Symposium for Professor Gunther F. Clauss on Hydrodynamics and Ocean Engineering (Vol. 5B). Article V05BT06A053 (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE; Vol. 5-B). American Society of Mechanical Engineers(ASME). Advance online publication. https://doi.org/10.1115/OMAE2022-79699

Malefaki, Iro ; Karperaki, Angeliki ; Belibassakis, Kostas. / NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION. Ocean Engineering; Honoring Symposium for Professor Gunther F. Clauss on Hydrodynamics and Ocean Engineering. Vol. 5B American Society of Mechanical Engineers(ASME), 2022. (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE).

@inproceedings{91cf1800ddd7441c9572f39aa76fd22b,

title = "NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION",

abstract = "In the present work, we focus on noise generation by a flapping foil used for small ship and AUV propulsion and its propagation in the inhomogeneous sea environment. The pressure field and the forces produced by flapping thruster motion, obtained by a BEM model, are used to calculate the dipole and monopole terms associated with the initial – boundary value problem governed by the wave equation. Initially, an acoustic model in free space based on the Farassat formulation is derived. Subsequently, the latter is extended to account for a bounded domain and an inhomogeneous medium. For simplicity, the 2D sea acoustic waveguide is considered, and the presented numerical method is based on a Finite Difference scheme (FDM), incorporating free-surface and seabed effects as well as a variable sound speed profile. Moreover, the numerical scheme is supplemented by a perfectly matched layer (PML) for the treatment of the outgoing radiating field behavior in the open boundaries. Numerical results are presented for the verification of the present method in the case of time-harmonic sources. Future extensions are discussed regarding the application of a Finite Element Method (FEM) – PML scheme to treat localized scatterers and curved boundaries as well as 3D effects.",

keywords = "FDM-PML model, flapping thruster, noise propagation, sea environment",

author = "Iro Malefaki and Angeliki Karperaki and Kostas Belibassakis",

note = "Funding Information: The present work has been supported by Seatech H2020 project received funding from the European Union{\textquoteright}s Horizon 2020 research and innovation program under the grant agreement No 857840. The opinions expressed in this document reflect only the author{\textquoteright}s view and in no way reflect the European Commission{\textquoteright}s opinions. The European Commission is not responsible for any use that may be made of the information it contains. ; ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022 ; Conference date: 05-06-2022 Through 10-06-2022",

year = "2022",

month = oct,

day = "13",

doi = "10.1115/OMAE2022-79699",

language = "English",

volume = "5B",

series = "Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE",

publisher = "American Society of Mechanical Engineers(ASME)",

booktitle = "Ocean Engineering; Honoring Symposium for Professor Gunther F. Clauss on Hydrodynamics and Ocean Engineering",

address = "United States",

}

Malefaki, I, Karperaki, A & Belibassakis, K 2022, NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION. in Ocean Engineering; Honoring Symposium for Professor Gunther F. Clauss on Hydrodynamics and Ocean Engineering. vol. 5B, V05BT06A053, Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, vol. 5-B, American Society of Mechanical Engineers(ASME), ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022, Hamburg, Germany, 5/06/22. https://doi.org/10.1115/OMAE2022-79699

NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION. / Malefaki, Iro; Karperaki, Angeliki; Belibassakis, Kostas.
Ocean Engineering; Honoring Symposium for Professor Gunther F. Clauss on Hydrodynamics and Ocean Engineering. Vol. 5B American Society of Mechanical Engineers(ASME), 2022. V05BT06A053 (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE; Vol. 5-B).

Research output: Chapter in Book/Published conference output › Conference publication

TY - GEN

T1 - NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION

AU - Malefaki, Iro

AU - Karperaki, Angeliki

AU - Belibassakis, Kostas

N1 - Funding Information: The present work has been supported by Seatech H2020 project received funding from the European Union’s Horizon 2020 research and innovation program under the grant agreement No 857840. The opinions expressed in this document reflect only the author’s view and in no way reflect the European Commission’s opinions. The European Commission is not responsible for any use that may be made of the information it contains.

PY - 2022/10/13

Y1 - 2022/10/13

N2 - In the present work, we focus on noise generation by a flapping foil used for small ship and AUV propulsion and its propagation in the inhomogeneous sea environment. The pressure field and the forces produced by flapping thruster motion, obtained by a BEM model, are used to calculate the dipole and monopole terms associated with the initial – boundary value problem governed by the wave equation. Initially, an acoustic model in free space based on the Farassat formulation is derived. Subsequently, the latter is extended to account for a bounded domain and an inhomogeneous medium. For simplicity, the 2D sea acoustic waveguide is considered, and the presented numerical method is based on a Finite Difference scheme (FDM), incorporating free-surface and seabed effects as well as a variable sound speed profile. Moreover, the numerical scheme is supplemented by a perfectly matched layer (PML) for the treatment of the outgoing radiating field behavior in the open boundaries. Numerical results are presented for the verification of the present method in the case of time-harmonic sources. Future extensions are discussed regarding the application of a Finite Element Method (FEM) – PML scheme to treat localized scatterers and curved boundaries as well as 3D effects.

AB - In the present work, we focus on noise generation by a flapping foil used for small ship and AUV propulsion and its propagation in the inhomogeneous sea environment. The pressure field and the forces produced by flapping thruster motion, obtained by a BEM model, are used to calculate the dipole and monopole terms associated with the initial – boundary value problem governed by the wave equation. Initially, an acoustic model in free space based on the Farassat formulation is derived. Subsequently, the latter is extended to account for a bounded domain and an inhomogeneous medium. For simplicity, the 2D sea acoustic waveguide is considered, and the presented numerical method is based on a Finite Difference scheme (FDM), incorporating free-surface and seabed effects as well as a variable sound speed profile. Moreover, the numerical scheme is supplemented by a perfectly matched layer (PML) for the treatment of the outgoing radiating field behavior in the open boundaries. Numerical results are presented for the verification of the present method in the case of time-harmonic sources. Future extensions are discussed regarding the application of a Finite Element Method (FEM) – PML scheme to treat localized scatterers and curved boundaries as well as 3D effects.

KW - FDM-PML model

KW - flapping thruster

KW - noise propagation

KW - sea environment

UR - http://www.scopus.com/inward/record.url?scp=85140720483&partnerID=8YFLogxK

UR - https://asmedigitalcollection.asme.org/OMAE/proceedings-abstract/OMAE2022/85901/V05BT06A053/1147879

U2 - 10.1115/OMAE2022-79699

DO - 10.1115/OMAE2022-79699

M3 - Conference publication

AN - SCOPUS:85140720483

VL - 5B

T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE

BT - Ocean Engineering; Honoring Symposium for Professor Gunther F. Clauss on Hydrodynamics and Ocean Engineering

PB - American Society of Mechanical Engineers(ASME)

T2 - ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022

Y2 - 5 June 2022 through 10 June 2022

ER -

Malefaki I, Karperaki A, Belibassakis K. NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION. In Ocean Engineering; Honoring Symposium for Professor Gunther F. Clauss on Hydrodynamics and Ocean Engineering. Vol. 5B. American Society of Mechanical Engineers(ASME). 2022. V05BT06A053. (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE). Epub 2022 Oct 13. doi: 10.1115/OMAE2022-79699

NOISE GENERATION AND PROPAGATION FROM FLAPPING-FOIL THRUSTERS USED FOR MARINE PROPULSION

Abstract

Publication series

Conference

Bibliographical note

Keywords

Access to Document

Other files and links

Fingerprint

Cite this