Effect of rudder angle on propeller wash velocities at a seabed

D Ryan; G.A. Hamill; H. T. Johnston

doi:10.1680/maen.2009.162.1.27

Effect of rudder angle on propeller wash velocities at a seabed

D Ryan, G.A. Hamill, H. T. Johnston

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

This paper deals with an experimental investigation intothe velocity distribution downstream of a propeller,operating at bollard pull conditions and in the presence ofa mobile sediment bed. Previous investigations eitherignored the effect of a rudder in the wash or consideredonly its influence on an unconfined jet. The velocityprofiles within the jet produced by a rotating propellerwith a rudder present were measured at a mobile bed andcompared to currently available predictive equations.The velocity distribution profiles in the jet, influenced bybed proximity, were found not to comply with currentpredictive methods. The velocity distributions measuredwithin the jet were found to be complex and nonsymmetrical.To provide a basic velocity predictive tool, aneural network analysis toolbox within Matlab wasutilised and trained using the experimental data.

Original language	English
Pages (from-to)	27-38
Journal	Proceedings of the ICE - Maritime Engineering
Volume	162
Issue number	MA1
DOIs	https://doi.org/10.1680/maen.2009.162.1.27
Publication status	Published (in print/issue) - Mar 2009

Bibliographical note

Reference text: 1. FUEHRER M. and ROMISCH K. Effects of modern ship traffic on
islands and ocean waterways and their structures. In Inland
Navigation: Proceedings of the 24th PIANC Congress,
Leningrad. PIANC, Brussels, Belgium, 1977, Section 1–3.
2. VERHEY H. J., BLOCKLAND T., BOGAERTS M. P., VOLGER D. and
WEYDE R. W. Experiences in the Netherlands with quay
structures subjected to velocities created by bow thrusters
and main propellers of mooring and unmooring ships.
PIANC Bulletin, 1987, 58, 69–88.
3. HAMILL G. A., MCGARVERY J. and HUGHES D. A. B.
Determination of the efflux velocity from a ship’s propeller
wash. Proceedings of the Institution of Civil Engineers,
Maritime Engineering, 2004, 157, No. 2, 83–91.
4. HASHMI H. N. Erosion of a Granular Bed at a Quay Wall
by a Ship’s Screw Wash. PhD thesis, Queens University of
Belfast, 1994.
5. BERGER W., FELKEL K., HAGER M., OEBIUS H. and SCHALE E.
Courant provoque par les bateaux protection des berges et
solution pour e´viter l’e´rosion du lit du haut Rhin. In
Proceedings of the 25th PIANC Congress, Edinburgh. PIANC,
Brussels, Belgium, 1981, Section I–1.
6. ROBAKIEWICZ W. The influence of the action of the jet behind
the screw on the bottom. Example of model and field
measurements with a trawler B-20. Rosprawy
Hydrotechniczne, 1966, 19, 177–215.
7. BERGH H. and CEDERWALL K. Propeller Erosion in Harbours.
Hydraulics Laboratory, Royal Institute of Technology,
Stockholm, Sweden, 1981, Bulletin No. TRITA-VBI-107.
8. FUEHRER M., POHL H. and ROMISCH K. Propeller jet erosion and
stability criteria for bottom protection of various constructions.
PIANC Bulletin, 1987, 58, 45–56.
9. MCGARVEY J. The Influence of the Rudder on the
Hydrodynamics, and the Resulting Bed Scour of a Ship’s
Screw Wash. PhD thesis, Queens University Belfast, 1996.
10. BLAAUW H. G. and VAN DE KAA E. J. Erosion of Bottom and
Sloping Banks Caused by the Screw Race of Manoeuvring
Ships. Delft Hydraulics Laboratory, The Netherlands, 1978,
Publication No. 202.
11. HAMILL G. A., MCGARVERY J. and HUGHES D. A. B. The effect of
rudder angle on the scouring action produced by the
propeller wash of a manoeuvring ship. Journal of the
Permanent International Association of Navigation
Congresses, 2001, 106, 49–62.
12. HAMILL G. A. The scouring action of the propeller jet
produced by a slowly manoeuvring ship. Journal of the
Permanent International Association of Navigation
Congresses, 1988, 62, 85–110.
13. CHATTERJEE S. S. and GHOSH S. N. Submerged horizontal jet
erodible bed. Journal of Hydraulics Division, ASCE, 1980,
106, No. 11, 1765–1782
14. SMITH M. D. Neural Networks for Statistical Modelling. Van
Nostrand Reinhold, New York, 1993.

Keywords

Scour
Propeller
Jet
Neural Network.

Access to Document

10.1680/maen.2009.162.1.27

http://www.icevirtuallibrary.com/content/article/10.1680/maen.2009.162.1.27

Cite this

@article{665aa42252e24dd98ebcf3ff9641f556,

title = "Effect of rudder angle on propeller wash velocities at a seabed",

abstract = "This paper deals with an experimental investigation intothe velocity distribution downstream of a propeller,operating at bollard pull conditions and in the presence ofa mobile sediment bed. Previous investigations eitherignored the effect of a rudder in the wash or consideredonly its influence on an unconfined jet. The velocityprofiles within the jet produced by a rotating propellerwith a rudder present were measured at a mobile bed andcompared to currently available predictive equations.The velocity distribution profiles in the jet, influenced bybed proximity, were found not to comply with currentpredictive methods. The velocity distributions measuredwithin the jet were found to be complex and nonsymmetrical.To provide a basic velocity predictive tool, aneural network analysis toolbox within Matlab wasutilised and trained using the experimental data.",

keywords = "Scour, Propeller, Jet, Neural Network.",

author = "D Ryan and G.A. Hamill and Johnston, {H. T.}",

note = "Reference text: 1. FUEHRER M. and ROMISCH K. Effects of modern ship traffic on islands and ocean waterways and their structures. In Inland Navigation: Proceedings of the 24th PIANC Congress, Leningrad. PIANC, Brussels, Belgium, 1977, Section 1–3. 2. VERHEY H. J., BLOCKLAND T., BOGAERTS M. P., VOLGER D. and WEYDE R. W. Experiences in the Netherlands with quay structures subjected to velocities created by bow thrusters and main propellers of mooring and unmooring ships. PIANC Bulletin, 1987, 58, 69–88. 3. HAMILL G. A., MCGARVERY J. and HUGHES D. A. B. Determination of the efflux velocity from a ship{\textquoteright}s propeller wash. Proceedings of the Institution of Civil Engineers, Maritime Engineering, 2004, 157, No. 2, 83–91. 4. HASHMI H. N. Erosion of a Granular Bed at a Quay Wall by a Ship{\textquoteright}s Screw Wash. PhD thesis, Queens University of Belfast, 1994. 5. BERGER W., FELKEL K., HAGER M., OEBIUS H. and SCHALE E. Courant provoque par les bateaux protection des berges et solution pour e´viter l{\textquoteright}e´rosion du lit du haut Rhin. In Proceedings of the 25th PIANC Congress, Edinburgh. PIANC, Brussels, Belgium, 1981, Section I–1. 6. ROBAKIEWICZ W. The influence of the action of the jet behind the screw on the bottom. Example of model and field measurements with a trawler B-20. Rosprawy Hydrotechniczne, 1966, 19, 177–215. 7. BERGH H. and CEDERWALL K. Propeller Erosion in Harbours. Hydraulics Laboratory, Royal Institute of Technology, Stockholm, Sweden, 1981, Bulletin No. TRITA-VBI-107. 8. FUEHRER M., POHL H. and ROMISCH K. Propeller jet erosion and stability criteria for bottom protection of various constructions. PIANC Bulletin, 1987, 58, 45–56. 9. MCGARVEY J. The Influence of the Rudder on the Hydrodynamics, and the Resulting Bed Scour of a Ship{\textquoteright}s Screw Wash. PhD thesis, Queens University Belfast, 1996. 10. BLAAUW H. G. and VAN DE KAA E. J. Erosion of Bottom and Sloping Banks Caused by the Screw Race of Manoeuvring Ships. Delft Hydraulics Laboratory, The Netherlands, 1978, Publication No. 202. 11. HAMILL G. A., MCGARVERY J. and HUGHES D. A. B. The effect of rudder angle on the scouring action produced by the propeller wash of a manoeuvring ship. Journal of the Permanent International Association of Navigation Congresses, 2001, 106, 49–62. 12. HAMILL G. A. The scouring action of the propeller jet produced by a slowly manoeuvring ship. Journal of the Permanent International Association of Navigation Congresses, 1988, 62, 85–110. 13. CHATTERJEE S. S. and GHOSH S. N. Submerged horizontal jet erodible bed. Journal of Hydraulics Division, ASCE, 1980, 106, No. 11, 1765–1782 14. SMITH M. D. Neural Networks for Statistical Modelling. Van Nostrand Reinhold, New York, 1993.",

year = "2009",

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doi = "10.1680/maen.2009.162.1.27",

language = "English",

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journal = "Proceedings of the ICE - Maritime Engineering",

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T1 - Effect of rudder angle on propeller wash velocities at a seabed

AU - Ryan, D

AU - Hamill, G.A.

AU - Johnston, H. T.

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PY - 2009/3

Y1 - 2009/3

N2 - This paper deals with an experimental investigation intothe velocity distribution downstream of a propeller,operating at bollard pull conditions and in the presence ofa mobile sediment bed. Previous investigations eitherignored the effect of a rudder in the wash or consideredonly its influence on an unconfined jet. The velocityprofiles within the jet produced by a rotating propellerwith a rudder present were measured at a mobile bed andcompared to currently available predictive equations.The velocity distribution profiles in the jet, influenced bybed proximity, were found not to comply with currentpredictive methods. The velocity distributions measuredwithin the jet were found to be complex and nonsymmetrical.To provide a basic velocity predictive tool, aneural network analysis toolbox within Matlab wasutilised and trained using the experimental data.

AB - This paper deals with an experimental investigation intothe velocity distribution downstream of a propeller,operating at bollard pull conditions and in the presence ofa mobile sediment bed. Previous investigations eitherignored the effect of a rudder in the wash or consideredonly its influence on an unconfined jet. The velocityprofiles within the jet produced by a rotating propellerwith a rudder present were measured at a mobile bed andcompared to currently available predictive equations.The velocity distribution profiles in the jet, influenced bybed proximity, were found not to comply with currentpredictive methods. The velocity distributions measuredwithin the jet were found to be complex and nonsymmetrical.To provide a basic velocity predictive tool, aneural network analysis toolbox within Matlab wasutilised and trained using the experimental data.

KW - Scour

KW - Propeller

KW - Jet

KW - Neural Network.

U2 - 10.1680/maen.2009.162.1.27

DO - 10.1680/maen.2009.162.1.27

M3 - Article

SN - 1741-7597

VL - 162

SP - 27

EP - 38

JO - Proceedings of the ICE - Maritime Engineering

JF - Proceedings of the ICE - Maritime Engineering

IS - MA1

ER -

Effect of rudder angle on propeller wash velocities at a seabed

Abstract

Bibliographical note

Keywords

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Cite this