Bosschers, Johan
Fifth International Symposium on Marine Propulsors smp’17, 2017.
@conference{Bosschers2017,
title = {A Semi-Empirical Method to Predict Broadband Hull Pressure Fluctuations and Underwater Radiated Noise by Cavitating Tip Vortices},
author = {Johan Bosschers},
url = {http://www.marin.nl/web/Publications/Publication-items/A-SemiEmpirical-Method-to-Predict-Broadband-Hull-Pressure-Fluctuations-and-Underwater-Radiated-Noise-by-Cavitating-Tip-Vortices.htm},
year = {2017},
date = {2017-06-01},
booktitle = {Fifth International Symposium on Marine Propulsors smp’17},
abstract = {A semi-empirical method is presented that predicts broadband hull pressure fluctuations and underwater radiated noise due to propeller tip vortex cavitation. The method uses a hump-shaped pattern for the spectrum and it predicts the center frequency and level of this hump. The principal parameter is the vortex cavity size which is predicted using a combination of a boundary element method and a semi-empirical vortex model. It is shown that such a model is able to well represent the variation of cavity size with cavitation number. Using a database of model-scale and full-scale measured hull pressure data, an empirical formulation for the center frequency and level has been developed that is a function of among others the cavity size. Predicted and measured hull pressure and radiated noise spectra are compared for various cases. Acceptable results are obtained but the comparison also shows differences that require adjustments of parameters which need to be further investigated. },
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Guilherme Vaz Thomas Lloyd, Douwe Rijpkema
Fifth International Symposium on Marine Propulsors smp’17, 2017.
@conference{Lloyd2017,
title = {Computational fluid dynamics prediction of marine propeller cavitation including solution verification},
author = {Thomas Lloyd, Guilherme Vaz, Douwe Rijpkema, Antoine Reverberi},
url = {http://www.marin.nl/web/Publications/Publication-items/Computational-fluid-dynamics-prediction-of-marine-propeller-cavitation-including-solution-verification.htm},
year = {2017},
date = {2017-06-01},
booktitle = {Fifth International Symposium on Marine Propulsors smp’17},
abstract = {This paper analyses the effect of grid refinement on computational fluid dynamics simulations of cavitating propeller flow. Refinement is made both globally, using geometrically similar grids, and locally, by applying adaptive grid refinement. The test case is the E779A propeller operating in uniform inflow conditions in a cavitation tunnel. This allows more computationally efficient steady simulations to be made, permitting a grid uncertainty analysis not previously seen for cavitating flow computations. Unsteady simulations are also presented in order to compare two turbulence modelling approaches. Differences in the discretisation uncertainty in terms of propeller thrust and torque were found to be small between wetted and cavitating flow conditions, although the order of convergence for the cavitating case is lower. Overall the largest effect of grid refinement is found to be in the tip vortex region, where differences in the predicted cavity extents are significant between grids. The use of adaptive grid refinement allows improved capture of tip vortex cavitation with fewer total grid cells, although the cavity extent is limited by increasing eddy viscosity when using RANS. Application of DDES reduces this influence somewhat, motivating further study into the potential of scale-resolving simulations in combination with adaptive grid refinement for vortex cavitation prediction.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Guilherme Vaz, Thomas Lloyd; Gnanasundaram, Arun
Improved Modelling Of Sheet Cavitation Dynamics On Delft Twistll Hydrofoil Conference
VII International Conference on Computational Methods in Marine Engineering, 2017.
@conference{Vaz2017,
title = {Improved Modelling Of Sheet Cavitation Dynamics On Delft Twistll Hydrofoil},
author = {Guilherme Vaz, Thomas Lloyd and Arun Gnanasundaram},
url = {http://www.marin.nl/web/Publications/Publication-items/Improved-Modelling-Of-Sheet-Cavitation-Dynamics-On-Delft-Twistll-Hydrofoil.htm},
year = {2017},
date = {2017-05-01},
booktitle = {VII International Conference on Computational Methods in Marine Engineering},
abstract = {In this paper, unsteady viscous-flow cavitation predictions for a 3D hydrofoil are performed using three different approaches: 1) a pure RANS method; 2) a RANS method including an eddy-viscosity “Reboud” correction; 3) a DDES Scale-Resolving-Simulation approach. Both wetted and cavitating flow conditions are analysed and compared with experimental data. The accuracy of these approaches is scrutinised in terms of integral quantities, cavity dynamics, different background principles, and the influence of grid refinement. Low numerical uncertainties have been obtained for wetted flow conditions, but a somewhat large deviation on the wing loading has been observed when compared with experimental results. For the cavitating flow case, the RANS calculations do not accurately simulate the cavity dynamics. The RANSReboud correction improves the fidelity of the calculations at increased numerical demands and decreased robustness. The DDES approach leads to improved dynamics, slightly less accurate cavity shedding mechanism, at lower computational cost. The cavity extents are underpredicted for all methods and conditions used, when compared with the available experimental data.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
THOMAS LLOYD CARLO NEGRATO, TOM VAN TERWISGA; BENSOW, RICKARD
NUMERICAL STUDY OF CAVITATION ON A NACA0015 HYDROFOIL: SOLUTION VERIFICATION Conference
VII International Conference on Computational Methods in Marine Engineering, 2017.
@conference{NEGRATO2017,
title = {NUMERICAL STUDY OF CAVITATION ON A NACA0015 HYDROFOIL: SOLUTION VERIFICATION},
author = {CARLO NEGRATO, THOMAS LLOYD, TOM VAN TERWISGA, GUILHERME VAZ AND RICKARD BENSOW},
url = {http://www.marin.nl/web/Publications/Publication-items/Numerical-Study-Of-Cavitation-On-A-NACA0015-Hydrofoil-Solution-Verification.htm},
year = {2017},
date = {2017-05-01},
booktitle = {VII International Conference on Computational Methods in Marine Engineering},
abstract = {The present paper analyses a series of Computational Fluid Dynamic simulations of the cavitating flow around a two-dimensional NACA0015 foil. The foil is placed at 6◦ angle of attack and the cavitation number is 1.1. Two mesh designs, namely a block-structured topology and an unstructured topology, are compared; additionally, grid refinements and time step refinements are carried out. Solution Verification is addressed with calculation of the discretization error and the numerical uncertainty. The numerical uncertainty for the average lift coefficient is found to be large, up to 15%. The reason is the difficulty of achieving a grid independent solution: with very fine meshes, the flow shifts from an attached, oscillating sheet cavity pattern to a regime dominated by shedding of cavity clouds. On the other hand, neither the time resolution nor the choice of grid topology influence largely the flow pattern; instead, they only lead to differences in the maximum and minimum cavity size.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Lafeber, Frans Hendrik; Bosschers, Johan
13th International Symposium on Practical Design of Ships (PRADS), Copenhagen, Denmark, no. ID105, 2016.
@conference{Lafeber2016,
title = {Validation of computational and experimental prediction methods for the underwater radiated noise of a small research vessel},
author = {Frans Hendrik Lafeber and Johan Bosschers},
url = {http://www.marin.nl/web/Publications/Papers/Validation-of-computational-and-experimental-prediction-methods-for-the-underwater-radiated-noise-of-a-small-research-vessel.htm},
year = {2016},
date = {2016-09-04},
booktitle = {13th International Symposium on Practical Design of Ships (PRADS), Copenhagen, Denmark},
number = {ID105},
abstract = {The underwater radiated noise of a small research vessel, The Princess Royal, has been predicted using computational methods and model tests and has been compared to full-scale data. For the model tests, a correction for the Lloyd’s mirror effect has been implemented in the analysis. The results are then compared to data from full-scale measurements. After correcting for the viscous scale effects on vortex cavitation, there is a good agreement between the model tests and full scale at the lowest speed. For the higher speeds (more cavita-tion), the agreement is good at the low and high frequency range, but there is a difference of about 10 dB between the model tests and full scale at mid frequency range.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
H.J. Prins, Flikkema
Suppression Of underwater Noise Induced by Cavitation: SONIC Conference
6th European Transport Research Conference, Warsaw, Poland, 2016.
@conference{Prins2016b,
title = {Suppression Of underwater Noise Induced by Cavitation: SONIC},
author = {Prins, H.J., Flikkema, M.B., Bosschers, J., Koldenhof, Y., Jong, C.A.F. de, Pestelli, C., Mumm, H., Bretschneider, H., Humphrey, V., Hyensjö, M.},
url = {http://www.marin.nl/web/Publications/Papers/Suppression-Of-underwater-Noise-Induced-by-Cavitation-SONIC.htm},
year = {2016},
date = {2016-04-01},
booktitle = {6th European Transport Research Conference, Warsaw, Poland},
abstract = {In EU FP7 project SONIC, partners set out in October 2012 to study the underwater radiated noise of ships and shipping. The objectives of the project were (1) to study the numerical and experimental techniques to determine the underwater noise; (2) to develop methods for mapping the noise of ships and shipping; and (3) to determine mitigation measures to reduce the underwater radiated noise.
Numerical methods focused on determination of the cavitation extent and dynamics on propellers which is the main source of noise of commercial shipping. Research also focused on methods to determine the underwater radiated noise from machinery. Experimental methods in model test facilities have been studied and validated against dedicated full scale measurements. The ship noise source levels obtained from these numerical and experimental methods provide input to shipping noise mapping tools to determine the overall underwater noise in a certain sea area.
Based on the experience gained in the SONIC project, a set of guidelines for regulators concerned with underwater radiated noise of ships were developed together with the AQUO project. These guidelines discuss the definitions, numerical and experimental methods and mitigation solutions for underwater radiated noise.
This paper gives an overview of the work done by all partners in the SONIC project.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Numerical methods focused on determination of the cavitation extent and dynamics on propellers which is the main source of noise of commercial shipping. Research also focused on methods to determine the underwater radiated noise from machinery. Experimental methods in model test facilities have been studied and validated against dedicated full scale measurements. The ship noise source levels obtained from these numerical and experimental methods provide input to shipping noise mapping tools to determine the overall underwater noise in a certain sea area.
Based on the experience gained in the SONIC project, a set of guidelines for regulators concerned with underwater radiated noise of ships were developed together with the AQUO project. These guidelines discuss the definitions, numerical and experimental methods and mitigation solutions for underwater radiated noise.
This paper gives an overview of the work done by all partners in the SONIC project.
Dang, Jie; Liu, Runwen; Pouw, Christiaan
Waterjet System Performance and Cavitation Test Procedures Conference
Proceedings of third International Symposium on Marine Propulsors (smp’13), Tasmania, Australia, SMP'13 2013.
@conference{Dang2013b,
title = {Waterjet System Performance and Cavitation Test Procedures},
author = {Jie Dang and Runwen Liu and Christiaan Pouw},
url = {http://www.marin.nl/web/Publications/Papers/Waterjet-System-Performance-and-Cavitation-Test-Procedures.htm
http://www.marinepropulsors.com/proceedings/2013/2B.1.pdf},
year = {2013},
date = {2013-05-05},
booktitle = {Proceedings of third International Symposium on Marine Propulsors (smp’13), Tasmania, Australia},
organization = {SMP'13},
abstract = {Different from marine propeller designs, which undergo standard stock and design propeller test programmes with detailed assessments of the final design (for the overall propulsive efficiency, the cavitation performance and the pressure fluctuations, etc.), waterjet systems of a final design are seldom tested for their system characteristics, the intake loss and the cavitation performance. It could be both due to economical reasons that waterjet system tests are relatively expensive. It could also be due to technical reasons, such as, that the operating point of a waterjet system does not vary too much for different operational conditions. This means that it performs also very well for all other operational (off-design) conditions once a waterjet system is well-designed for its design condition. However in practice, mismatching of power absorption and shaft rotational rate, and cavitation erosion, are now and then found after the sea trials of the waterjet propelled ships. Remedial action is needed then. In some cases, removing cavitation erosion can be rather difficult and simple modifications may not solve the problem.
In order to prevent those kinds of problems from the early design stage, waterjet system performance and cavitation tests of the final design are strongly recommended. Taking example of a Fast River Passenger Ferry, test procedures are discussed in detail in the present paper. The scale effects and the extrapolation method are also addressed. The results provide a good data set for CFD validation too. },
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
In order to prevent those kinds of problems from the early design stage, waterjet system performance and cavitation tests of the final design are strongly recommended. Taking example of a Fast River Passenger Ferry, test procedures are discussed in detail in the present paper. The scale effects and the extrapolation method are also addressed. The results provide a good data set for CFD validation too.
Hooijmans, Patrick
Setting new standards in container ship design Journal Article
In: MARIN Report, no. 106, pp. 14, 2012.
@article{Hooijmans2012b,
title = {Setting new standards in container ship design},
author = {Patrick Hooijmans},
url = {http://www.marin.nl/web/Publications/Publication-items/Setting-new-standards-in-container-ship-design.htm},
year = {2012},
date = {2012-08-01},
journal = {MARIN Report},
number = {106},
pages = {14},
abstract = {Seaspan Saver, a 10,000 TEU container vessel is setting new standards in container ship design. MARIN is proud to have played a role in this pioneering design, which is highlighted here.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2017
Bosschers, Johan
Fifth International Symposium on Marine Propulsors smp’17, 2017.
Abstract | Links | BibTeX | Tags: cavitation, hull pressures, propeller, tip vortex, underwater radiated noise
@conference{Bosschers2017,
title = {A Semi-Empirical Method to Predict Broadband Hull Pressure Fluctuations and Underwater Radiated Noise by Cavitating Tip Vortices},
author = {Johan Bosschers},
url = {http://www.marin.nl/web/Publications/Publication-items/A-SemiEmpirical-Method-to-Predict-Broadband-Hull-Pressure-Fluctuations-and-Underwater-Radiated-Noise-by-Cavitating-Tip-Vortices.htm},
year = {2017},
date = {2017-06-01},
booktitle = {Fifth International Symposium on Marine Propulsors smp’17},
abstract = {A semi-empirical method is presented that predicts broadband hull pressure fluctuations and underwater radiated noise due to propeller tip vortex cavitation. The method uses a hump-shaped pattern for the spectrum and it predicts the center frequency and level of this hump. The principal parameter is the vortex cavity size which is predicted using a combination of a boundary element method and a semi-empirical vortex model. It is shown that such a model is able to well represent the variation of cavity size with cavitation number. Using a database of model-scale and full-scale measured hull pressure data, an empirical formulation for the center frequency and level has been developed that is a function of among others the cavity size. Predicted and measured hull pressure and radiated noise spectra are compared for various cases. Acceptable results are obtained but the comparison also shows differences that require adjustments of parameters which need to be further investigated. },
keywords = {cavitation, hull pressures, propeller, tip vortex, underwater radiated noise},
pubstate = {published},
tppubtype = {conference}
}
Guilherme Vaz Thomas Lloyd, Douwe Rijpkema
Fifth International Symposium on Marine Propulsors smp’17, 2017.
Abstract | Links | BibTeX | Tags: adaptive grid refinement, cavitation, DDES, RANS, verification
@conference{Lloyd2017,
title = {Computational fluid dynamics prediction of marine propeller cavitation including solution verification},
author = {Thomas Lloyd, Guilherme Vaz, Douwe Rijpkema, Antoine Reverberi},
url = {http://www.marin.nl/web/Publications/Publication-items/Computational-fluid-dynamics-prediction-of-marine-propeller-cavitation-including-solution-verification.htm},
year = {2017},
date = {2017-06-01},
booktitle = {Fifth International Symposium on Marine Propulsors smp’17},
abstract = {This paper analyses the effect of grid refinement on computational fluid dynamics simulations of cavitating propeller flow. Refinement is made both globally, using geometrically similar grids, and locally, by applying adaptive grid refinement. The test case is the E779A propeller operating in uniform inflow conditions in a cavitation tunnel. This allows more computationally efficient steady simulations to be made, permitting a grid uncertainty analysis not previously seen for cavitating flow computations. Unsteady simulations are also presented in order to compare two turbulence modelling approaches. Differences in the discretisation uncertainty in terms of propeller thrust and torque were found to be small between wetted and cavitating flow conditions, although the order of convergence for the cavitating case is lower. Overall the largest effect of grid refinement is found to be in the tip vortex region, where differences in the predicted cavity extents are significant between grids. The use of adaptive grid refinement allows improved capture of tip vortex cavitation with fewer total grid cells, although the cavity extent is limited by increasing eddy viscosity when using RANS. Application of DDES reduces this influence somewhat, motivating further study into the potential of scale-resolving simulations in combination with adaptive grid refinement for vortex cavitation prediction.},
keywords = {adaptive grid refinement, cavitation, DDES, RANS, verification},
pubstate = {published},
tppubtype = {conference}
}
Guilherme Vaz, Thomas Lloyd; Gnanasundaram, Arun
Improved Modelling Of Sheet Cavitation Dynamics On Delft Twistll Hydrofoil Conference
VII International Conference on Computational Methods in Marine Engineering, 2017.
Abstract | Links | BibTeX | Tags: cavitation, DDES, Delft Foil, RANS, Reboud-correction, ReFRESCO
@conference{Vaz2017,
title = {Improved Modelling Of Sheet Cavitation Dynamics On Delft Twistll Hydrofoil},
author = {Guilherme Vaz, Thomas Lloyd and Arun Gnanasundaram},
url = {http://www.marin.nl/web/Publications/Publication-items/Improved-Modelling-Of-Sheet-Cavitation-Dynamics-On-Delft-Twistll-Hydrofoil.htm},
year = {2017},
date = {2017-05-01},
booktitle = {VII International Conference on Computational Methods in Marine Engineering},
abstract = {In this paper, unsteady viscous-flow cavitation predictions for a 3D hydrofoil are performed using three different approaches: 1) a pure RANS method; 2) a RANS method including an eddy-viscosity “Reboud” correction; 3) a DDES Scale-Resolving-Simulation approach. Both wetted and cavitating flow conditions are analysed and compared with experimental data. The accuracy of these approaches is scrutinised in terms of integral quantities, cavity dynamics, different background principles, and the influence of grid refinement. Low numerical uncertainties have been obtained for wetted flow conditions, but a somewhat large deviation on the wing loading has been observed when compared with experimental results. For the cavitating flow case, the RANS calculations do not accurately simulate the cavity dynamics. The RANSReboud correction improves the fidelity of the calculations at increased numerical demands and decreased robustness. The DDES approach leads to improved dynamics, slightly less accurate cavity shedding mechanism, at lower computational cost. The cavity extents are underpredicted for all methods and conditions used, when compared with the available experimental data.},
keywords = {cavitation, DDES, Delft Foil, RANS, Reboud-correction, ReFRESCO},
pubstate = {published},
tppubtype = {conference}
}
THOMAS LLOYD CARLO NEGRATO, TOM VAN TERWISGA; BENSOW, RICKARD
NUMERICAL STUDY OF CAVITATION ON A NACA0015 HYDROFOIL: SOLUTION VERIFICATION Conference
VII International Conference on Computational Methods in Marine Engineering, 2017.
Abstract | Links | BibTeX | Tags: cavitation, Discretization Error, NACA0015 foil, RANS, verification
@conference{NEGRATO2017,
title = {NUMERICAL STUDY OF CAVITATION ON A NACA0015 HYDROFOIL: SOLUTION VERIFICATION},
author = {CARLO NEGRATO, THOMAS LLOYD, TOM VAN TERWISGA, GUILHERME VAZ AND RICKARD BENSOW},
url = {http://www.marin.nl/web/Publications/Publication-items/Numerical-Study-Of-Cavitation-On-A-NACA0015-Hydrofoil-Solution-Verification.htm},
year = {2017},
date = {2017-05-01},
booktitle = {VII International Conference on Computational Methods in Marine Engineering},
abstract = {The present paper analyses a series of Computational Fluid Dynamic simulations of the cavitating flow around a two-dimensional NACA0015 foil. The foil is placed at 6◦ angle of attack and the cavitation number is 1.1. Two mesh designs, namely a block-structured topology and an unstructured topology, are compared; additionally, grid refinements and time step refinements are carried out. Solution Verification is addressed with calculation of the discretization error and the numerical uncertainty. The numerical uncertainty for the average lift coefficient is found to be large, up to 15%. The reason is the difficulty of achieving a grid independent solution: with very fine meshes, the flow shifts from an attached, oscillating sheet cavity pattern to a regime dominated by shedding of cavity clouds. On the other hand, neither the time resolution nor the choice of grid topology influence largely the flow pattern; instead, they only lead to differences in the maximum and minimum cavity size.},
keywords = {cavitation, Discretization Error, NACA0015 foil, RANS, verification},
pubstate = {published},
tppubtype = {conference}
}
2016
Lafeber, Frans Hendrik; Bosschers, Johan
13th International Symposium on Practical Design of Ships (PRADS), Copenhagen, Denmark, no. ID105, 2016.
Abstract | Links | BibTeX | Tags: cavitation, computations, model tests, propeller, underwater radiated noise
@conference{Lafeber2016,
title = {Validation of computational and experimental prediction methods for the underwater radiated noise of a small research vessel},
author = {Frans Hendrik Lafeber and Johan Bosschers},
url = {http://www.marin.nl/web/Publications/Papers/Validation-of-computational-and-experimental-prediction-methods-for-the-underwater-radiated-noise-of-a-small-research-vessel.htm},
year = {2016},
date = {2016-09-04},
booktitle = {13th International Symposium on Practical Design of Ships (PRADS), Copenhagen, Denmark},
number = {ID105},
abstract = {The underwater radiated noise of a small research vessel, The Princess Royal, has been predicted using computational methods and model tests and has been compared to full-scale data. For the model tests, a correction for the Lloyd’s mirror effect has been implemented in the analysis. The results are then compared to data from full-scale measurements. After correcting for the viscous scale effects on vortex cavitation, there is a good agreement between the model tests and full scale at the lowest speed. For the higher speeds (more cavita-tion), the agreement is good at the low and high frequency range, but there is a difference of about 10 dB between the model tests and full scale at mid frequency range.},
keywords = {cavitation, computations, model tests, propeller, underwater radiated noise},
pubstate = {published},
tppubtype = {conference}
}
H.J. Prins, Flikkema
Suppression Of underwater Noise Induced by Cavitation: SONIC Conference
6th European Transport Research Conference, Warsaw, Poland, 2016.
Abstract | Links | BibTeX | Tags: cavitation, Full scale tests, model tests, Noise, Noise Mitigation, Shipping, Sound, Sound Mapping
@conference{Prins2016b,
title = {Suppression Of underwater Noise Induced by Cavitation: SONIC},
author = {Prins, H.J., Flikkema, M.B., Bosschers, J., Koldenhof, Y., Jong, C.A.F. de, Pestelli, C., Mumm, H., Bretschneider, H., Humphrey, V., Hyensjö, M.},
url = {http://www.marin.nl/web/Publications/Papers/Suppression-Of-underwater-Noise-Induced-by-Cavitation-SONIC.htm},
year = {2016},
date = {2016-04-01},
booktitle = {6th European Transport Research Conference, Warsaw, Poland},
abstract = {In EU FP7 project SONIC, partners set out in October 2012 to study the underwater radiated noise of ships and shipping. The objectives of the project were (1) to study the numerical and experimental techniques to determine the underwater noise; (2) to develop methods for mapping the noise of ships and shipping; and (3) to determine mitigation measures to reduce the underwater radiated noise.
Numerical methods focused on determination of the cavitation extent and dynamics on propellers which is the main source of noise of commercial shipping. Research also focused on methods to determine the underwater radiated noise from machinery. Experimental methods in model test facilities have been studied and validated against dedicated full scale measurements. The ship noise source levels obtained from these numerical and experimental methods provide input to shipping noise mapping tools to determine the overall underwater noise in a certain sea area.
Based on the experience gained in the SONIC project, a set of guidelines for regulators concerned with underwater radiated noise of ships were developed together with the AQUO project. These guidelines discuss the definitions, numerical and experimental methods and mitigation solutions for underwater radiated noise.
This paper gives an overview of the work done by all partners in the SONIC project.},
keywords = {cavitation, Full scale tests, model tests, Noise, Noise Mitigation, Shipping, Sound, Sound Mapping},
pubstate = {published},
tppubtype = {conference}
}
Numerical methods focused on determination of the cavitation extent and dynamics on propellers which is the main source of noise of commercial shipping. Research also focused on methods to determine the underwater radiated noise from machinery. Experimental methods in model test facilities have been studied and validated against dedicated full scale measurements. The ship noise source levels obtained from these numerical and experimental methods provide input to shipping noise mapping tools to determine the overall underwater noise in a certain sea area.
Based on the experience gained in the SONIC project, a set of guidelines for regulators concerned with underwater radiated noise of ships were developed together with the AQUO project. These guidelines discuss the definitions, numerical and experimental methods and mitigation solutions for underwater radiated noise.
This paper gives an overview of the work done by all partners in the SONIC project.
2013
Dang, Jie; Liu, Runwen; Pouw, Christiaan
Waterjet System Performance and Cavitation Test Procedures Conference
Proceedings of third International Symposium on Marine Propulsors (smp’13), Tasmania, Australia, SMP'13 2013.
Abstract | Links | BibTeX | Tags: cavitation, CFD, procedures, waterjet
@conference{Dang2013b,
title = {Waterjet System Performance and Cavitation Test Procedures},
author = {Jie Dang and Runwen Liu and Christiaan Pouw},
url = {http://www.marin.nl/web/Publications/Papers/Waterjet-System-Performance-and-Cavitation-Test-Procedures.htm
http://www.marinepropulsors.com/proceedings/2013/2B.1.pdf},
year = {2013},
date = {2013-05-05},
booktitle = {Proceedings of third International Symposium on Marine Propulsors (smp’13), Tasmania, Australia},
organization = {SMP'13},
abstract = {Different from marine propeller designs, which undergo standard stock and design propeller test programmes with detailed assessments of the final design (for the overall propulsive efficiency, the cavitation performance and the pressure fluctuations, etc.), waterjet systems of a final design are seldom tested for their system characteristics, the intake loss and the cavitation performance. It could be both due to economical reasons that waterjet system tests are relatively expensive. It could also be due to technical reasons, such as, that the operating point of a waterjet system does not vary too much for different operational conditions. This means that it performs also very well for all other operational (off-design) conditions once a waterjet system is well-designed for its design condition. However in practice, mismatching of power absorption and shaft rotational rate, and cavitation erosion, are now and then found after the sea trials of the waterjet propelled ships. Remedial action is needed then. In some cases, removing cavitation erosion can be rather difficult and simple modifications may not solve the problem.
In order to prevent those kinds of problems from the early design stage, waterjet system performance and cavitation tests of the final design are strongly recommended. Taking example of a Fast River Passenger Ferry, test procedures are discussed in detail in the present paper. The scale effects and the extrapolation method are also addressed. The results provide a good data set for CFD validation too. },
keywords = {cavitation, CFD, procedures, waterjet},
pubstate = {published},
tppubtype = {conference}
}
In order to prevent those kinds of problems from the early design stage, waterjet system performance and cavitation tests of the final design are strongly recommended. Taking example of a Fast River Passenger Ferry, test procedures are discussed in detail in the present paper. The scale effects and the extrapolation method are also addressed. The results provide a good data set for CFD validation too.
2012
Hooijmans, Patrick
Setting new standards in container ship design Journal Article
In: MARIN Report, no. 106, pp. 14, 2012.
Abstract | Links | BibTeX | Tags: 20000TEU, cavitation, CFD, containerships
@article{Hooijmans2012b,
title = {Setting new standards in container ship design},
author = {Patrick Hooijmans},
url = {http://www.marin.nl/web/Publications/Publication-items/Setting-new-standards-in-container-ship-design.htm},
year = {2012},
date = {2012-08-01},
journal = {MARIN Report},
number = {106},
pages = {14},
abstract = {Seaspan Saver, a 10,000 TEU container vessel is setting new standards in container ship design. MARIN is proud to have played a role in this pioneering design, which is highlighted here.},
keywords = {20000TEU, cavitation, CFD, containerships},
pubstate = {published},
tppubtype = {article}
}