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}
}
Joy; Veldhuis Klinkenberg, Christian
CFD for twin gondola aft ship design Conference
Proceedings of PRADS2016, 4th – 8th September, 2016, Copenhagen, Denmark, 2016.
@conference{Klinkenberg2016,
title = {CFD for twin gondola aft ship design},
author = {Klinkenberg, Joy; Veldhuis, Christian},
url = {http://www.marin.nl/web/Publications/Papers/CFD-for-twin-gondola-aft-ship-design.htm},
year = {2016},
date = {2016-09-04},
booktitle = {Proceedings of PRADS2016, 4th – 8th September, 2016, Copenhagen, Denmark},
abstract = {This paper shows a test case in the optimization for a twingondola
ship. In optimizing ships, one can optimize for minimal
resistance or for minimal power. For twin-gondola this
choice is of great importance, due to the asymmetric nature of
the flow coming into the propeller. We first show the optimization
of a twin-gondola ship for resistance only, where the
decrease in resistance is found to be 1.5%. When including the
propeller, using RaNS-BEM coupling, a large difference is
found between inward and outward rotating propeller. The
ship with the largest resistance, requires the least power if the
propeller turns in the right direction. We show that RaNSBEM
coupling could be an efficient method of taking the
propeller rotation direction into account in an optimization
process. The results are also compared to a model test of the
same ship, showing the same trend.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
ship. In optimizing ships, one can optimize for minimal
resistance or for minimal power. For twin-gondola this
choice is of great importance, due to the asymmetric nature of
the flow coming into the propeller. We first show the optimization
of a twin-gondola ship for resistance only, where the
decrease in resistance is found to be 1.5%. When including the
propeller, using RaNS-BEM coupling, a large difference is
found between inward and outward rotating propeller. The
ship with the largest resistance, requires the least power if the
propeller turns in the right direction. We show that RaNSBEM
coupling could be an efficient method of taking the
propeller rotation direction into account in an optimization
process. The results are also compared to a model test of the
same ship, showing the same trend.
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}
}
van den Boom, Henk; Dang, Jie
Success of renowned ‘Wageningen B’ followed by the future-ready C & D-Series Journal Article
In: MARIN Report, no. 116, pp. 26-27, 2015.
@article{Boom2015,
title = {Success of renowned ‘Wageningen B’ followed by the future-ready C & D-Series},
author = {Henk van den Boom and Jie Dang},
url = {http://content.yudu.com/web/1r3p1/0A3a046/MR116/html/index.html?page=26},
year = {2015},
date = {2015-12-01},
journal = {MARIN Report},
number = {116},
pages = {26-27},
abstract = {A three-year JIP leads to 35 new, open and ducted Controllable Pitch Propeller (CPP) designs after a test programme involving more than 750 open water tests.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dang, Jie; Chen, Hao; Rueda, Luis; Willemsen, Harry
Fourth International Symposium on Marine Propulsors (SMP), Austin, Texas , Symposiums on Marine Propulsors 2015.
@conference{Dang2015,
title = {Integrated Design of Asymmetric Aftbody and Propeller for an Aframax Tanker to Maximize Energy Efficiency},
author = {Jie Dang and Hao Chen and Luis Rueda and Harry Willemsen},
url = {http://www.marin.nl/web/Publications/Papers/Integrated-Design-of-Asymmetric-Aftbody-and-Propeller-for-an-Aframax-Tanker-to-Maximize-Energy-Efficiency.htm
http://www.marinepropulsors.com/proceedings.php},
year = {2015},
date = {2015-06-01},
booktitle = {Fourth International Symposium on Marine Propulsors (SMP), Austin, Texas },
organization = {Symposiums on Marine Propulsors},
abstract = {With the implementation of the EEDI, energy saving and emission reduction of ships, especially merchant ships, become more and more important. To achieve high efficiency and low emissions, recently Energy Saving Devices (ESDs) have been re-studied and installed to many ships, both new buildings and also retrofits. Various ESDs, including new concepts, have been tested in model scale and large improvements on energy efficiency have been confirmed. However due to the fact that most ESDs are fitted in the wake field, the performance of the ESDs is influenced by scale effects. For the operators, the fouling and the structure integration of the ESD’s with the hull are the important issues to make decisions on applying ESDs to their ships.
Distinguished from the ESDs where extra ‘appendages’ have to be added in front of and/or behind a propeller, an asymmetric aftbody can also change the flow towards the propeller without appendages. The wake with pre-swirl generated by an asymmetric aftbody is in general more uniform than that by an ESD (such as a pre-stator with finite blades) and with almost no penalty on the ship’s resistance. By integrating a propeller, a ship with asymmetric aftbody can be designed so that the hull-propeller interaction is optimized for its total propulsive efficiency and the required shaft power is minimized at given speed.
In this paper, discussions have been given on the optimization procedure by using the Computational Fluid Dynamics (CFD) towards a fully-integrated hull-propeller design to maximize the energy efficiency of a single screw ship. Comparative model tests, carried out with optimized symmetric and asymmetric ships, showed more than 6% gain in efficiency with a moderate asymmetric aftbody, without detriments to its course stability. },
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Distinguished from the ESDs where extra ‘appendages’ have to be added in front of and/or behind a propeller, an asymmetric aftbody can also change the flow towards the propeller without appendages. The wake with pre-swirl generated by an asymmetric aftbody is in general more uniform than that by an ESD (such as a pre-stator with finite blades) and with almost no penalty on the ship’s resistance. By integrating a propeller, a ship with asymmetric aftbody can be designed so that the hull-propeller interaction is optimized for its total propulsive efficiency and the required shaft power is minimized at given speed.
In this paper, discussions have been given on the optimization procedure by using the Computational Fluid Dynamics (CFD) towards a fully-integrated hull-propeller design to maximize the energy efficiency of a single screw ship. Comparative model tests, carried out with optimized symmetric and asymmetric ships, showed more than 6% gain in efficiency with a moderate asymmetric aftbody, without detriments to its course stability.
Zondervan, Gert-Jan; Dang, Jie
MARIN spearheads propulsion improvements Journal Article
In: MARIN Report, no. 104, pp. 16-17, 2011.
@article{zondervan2011,
title = {MARIN spearheads propulsion improvements},
author = {Gert-Jan Zondervan and Jie Dang},
url = {http://www.marin.nl/web/Publications/Publication-items/MARIN-spearheads-propulsion-improvements.htm},
year = {2011},
date = {2011-12-01},
journal = {MARIN Report},
number = {104},
pages = {16-17},
abstract = {Fuel saving and emission reduction are motivating factors in the drive to improve marine propulsor technology and in the renewed interest in special devices that improve propulsion. Together with the industry, MARIN is actively investigating their working principles and the critical design aspects, using modern design and analysis tools.},
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}
}
2016
Joy; Veldhuis Klinkenberg, Christian
CFD for twin gondola aft ship design Conference
Proceedings of PRADS2016, 4th – 8th September, 2016, Copenhagen, Denmark, 2016.
Abstract | Links | BibTeX | Tags: optimization, propeller, RANS-BEM, rotation direction, twin-gondola
@conference{Klinkenberg2016,
title = {CFD for twin gondola aft ship design},
author = {Klinkenberg, Joy; Veldhuis, Christian},
url = {http://www.marin.nl/web/Publications/Papers/CFD-for-twin-gondola-aft-ship-design.htm},
year = {2016},
date = {2016-09-04},
booktitle = {Proceedings of PRADS2016, 4th – 8th September, 2016, Copenhagen, Denmark},
abstract = {This paper shows a test case in the optimization for a twingondola
ship. In optimizing ships, one can optimize for minimal
resistance or for minimal power. For twin-gondola this
choice is of great importance, due to the asymmetric nature of
the flow coming into the propeller. We first show the optimization
of a twin-gondola ship for resistance only, where the
decrease in resistance is found to be 1.5%. When including the
propeller, using RaNS-BEM coupling, a large difference is
found between inward and outward rotating propeller. The
ship with the largest resistance, requires the least power if the
propeller turns in the right direction. We show that RaNSBEM
coupling could be an efficient method of taking the
propeller rotation direction into account in an optimization
process. The results are also compared to a model test of the
same ship, showing the same trend.},
keywords = {optimization, propeller, RANS-BEM, rotation direction, twin-gondola},
pubstate = {published},
tppubtype = {conference}
}
ship. In optimizing ships, one can optimize for minimal
resistance or for minimal power. For twin-gondola this
choice is of great importance, due to the asymmetric nature of
the flow coming into the propeller. We first show the optimization
of a twin-gondola ship for resistance only, where the
decrease in resistance is found to be 1.5%. When including the
propeller, using RaNS-BEM coupling, a large difference is
found between inward and outward rotating propeller. The
ship with the largest resistance, requires the least power if the
propeller turns in the right direction. We show that RaNSBEM
coupling could be an efficient method of taking the
propeller rotation direction into account in an optimization
process. The results are also compared to a model test of the
same ship, showing the same trend.
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}
}
2015
van den Boom, Henk; Dang, Jie
Success of renowned ‘Wageningen B’ followed by the future-ready C & D-Series Journal Article
In: MARIN Report, no. 116, pp. 26-27, 2015.
Abstract | Links | BibTeX | Tags: CPP, ducted, propeller, series, Wageningen B
@article{Boom2015,
title = {Success of renowned ‘Wageningen B’ followed by the future-ready C & D-Series},
author = {Henk van den Boom and Jie Dang},
url = {http://content.yudu.com/web/1r3p1/0A3a046/MR116/html/index.html?page=26},
year = {2015},
date = {2015-12-01},
journal = {MARIN Report},
number = {116},
pages = {26-27},
abstract = {A three-year JIP leads to 35 new, open and ducted Controllable Pitch Propeller (CPP) designs after a test programme involving more than 750 open water tests.},
keywords = {CPP, ducted, propeller, series, Wageningen B},
pubstate = {published},
tppubtype = {article}
}
Dang, Jie; Chen, Hao; Rueda, Luis; Willemsen, Harry
Fourth International Symposium on Marine Propulsors (SMP), Austin, Texas , Symposiums on Marine Propulsors 2015.
Abstract | Links | BibTeX | Tags: aframax, asymmetric aftbody, CFD, efficiency, Energy Saving Device, ESD, propeller, RANS-BEM, tanker
@conference{Dang2015,
title = {Integrated Design of Asymmetric Aftbody and Propeller for an Aframax Tanker to Maximize Energy Efficiency},
author = {Jie Dang and Hao Chen and Luis Rueda and Harry Willemsen},
url = {http://www.marin.nl/web/Publications/Papers/Integrated-Design-of-Asymmetric-Aftbody-and-Propeller-for-an-Aframax-Tanker-to-Maximize-Energy-Efficiency.htm
http://www.marinepropulsors.com/proceedings.php},
year = {2015},
date = {2015-06-01},
booktitle = {Fourth International Symposium on Marine Propulsors (SMP), Austin, Texas },
organization = {Symposiums on Marine Propulsors},
abstract = {With the implementation of the EEDI, energy saving and emission reduction of ships, especially merchant ships, become more and more important. To achieve high efficiency and low emissions, recently Energy Saving Devices (ESDs) have been re-studied and installed to many ships, both new buildings and also retrofits. Various ESDs, including new concepts, have been tested in model scale and large improvements on energy efficiency have been confirmed. However due to the fact that most ESDs are fitted in the wake field, the performance of the ESDs is influenced by scale effects. For the operators, the fouling and the structure integration of the ESD’s with the hull are the important issues to make decisions on applying ESDs to their ships.
Distinguished from the ESDs where extra ‘appendages’ have to be added in front of and/or behind a propeller, an asymmetric aftbody can also change the flow towards the propeller without appendages. The wake with pre-swirl generated by an asymmetric aftbody is in general more uniform than that by an ESD (such as a pre-stator with finite blades) and with almost no penalty on the ship’s resistance. By integrating a propeller, a ship with asymmetric aftbody can be designed so that the hull-propeller interaction is optimized for its total propulsive efficiency and the required shaft power is minimized at given speed.
In this paper, discussions have been given on the optimization procedure by using the Computational Fluid Dynamics (CFD) towards a fully-integrated hull-propeller design to maximize the energy efficiency of a single screw ship. Comparative model tests, carried out with optimized symmetric and asymmetric ships, showed more than 6% gain in efficiency with a moderate asymmetric aftbody, without detriments to its course stability. },
keywords = {aframax, asymmetric aftbody, CFD, efficiency, Energy Saving Device, ESD, propeller, RANS-BEM, tanker},
pubstate = {published},
tppubtype = {conference}
}
Distinguished from the ESDs where extra ‘appendages’ have to be added in front of and/or behind a propeller, an asymmetric aftbody can also change the flow towards the propeller without appendages. The wake with pre-swirl generated by an asymmetric aftbody is in general more uniform than that by an ESD (such as a pre-stator with finite blades) and with almost no penalty on the ship’s resistance. By integrating a propeller, a ship with asymmetric aftbody can be designed so that the hull-propeller interaction is optimized for its total propulsive efficiency and the required shaft power is minimized at given speed.
In this paper, discussions have been given on the optimization procedure by using the Computational Fluid Dynamics (CFD) towards a fully-integrated hull-propeller design to maximize the energy efficiency of a single screw ship. Comparative model tests, carried out with optimized symmetric and asymmetric ships, showed more than 6% gain in efficiency with a moderate asymmetric aftbody, without detriments to its course stability.
2011
Zondervan, Gert-Jan; Dang, Jie
MARIN spearheads propulsion improvements Journal Article
In: MARIN Report, no. 104, pp. 16-17, 2011.
Abstract | Links | BibTeX | Tags: CFD, efficiency, ESD, Fuel consumption, propeller
@article{zondervan2011,
title = {MARIN spearheads propulsion improvements},
author = {Gert-Jan Zondervan and Jie Dang},
url = {http://www.marin.nl/web/Publications/Publication-items/MARIN-spearheads-propulsion-improvements.htm},
year = {2011},
date = {2011-12-01},
journal = {MARIN Report},
number = {104},
pages = {16-17},
abstract = {Fuel saving and emission reduction are motivating factors in the drive to improve marine propulsor technology and in the renewed interest in special devices that improve propulsion. Together with the industry, MARIN is actively investigating their working principles and the critical design aspects, using modern design and analysis tools.},
keywords = {CFD, efficiency, ESD, Fuel consumption, propeller},
pubstate = {published},
tppubtype = {article}
}