Johan Bosschers

Expertise areas

Publications

Paper

A procedure for estimating mitigation effect of air injection on ship underwater radiated noise

25 aug. 2024

Increasing evidence exists that underwater radiated noise from ships has a negative impact on marine ecosystems. This has led to initiatives aimed ...

Paper

Numerical and Experimental Investigation of the Tip Vortex Flow Induced by an Elliptical Foil

8 jul. 2024

This collaborative paper within the AVT-320 joint research activity compares Computational Fluid Dynamics (CFD) results from diverse methods across ...

Paper

PIANO: A physics-based semi-empirical source level model for fleet-scale ship URN prediction

17 mrt. 2024

Concern is growing about the impacts of continuous underwater radiated noise (URN) from ships on marine fauna. In anticipation of future regulation ...

Paper

Ship URN mitigation by air injection: model-scale experiments and application to full-scale measurement data

17 mrt. 2024

It is recognised that continuous underwater radiated noise (URN) from shipping needs to be mitigated in order to minimise impact on marine animals. ...

Paper

Scale Model Measurements of Ship Machinery Noise Mitigation by Air Injection

24 okt. 2023

Underwater radiated noise (URN) from shipping is a main contributor to the rising noise levels in the oceans. There is growing evidence that this ...

Paper

Estimation of the underwater radiated noise by ship propeller cavitation using onboard sensor

9 jul. 2023

The use of onboard sensors to estimate the source levels of the underwater radiated noise (URN) of propeller cavitation of a research vessel is ...

Paper

Prediction of underwater radiated noise from propeller cavitation during concept design

17 okt. 2022

There is growing concern about the impact of underwater radiated noise (URN) on marine life. One of the main sources of URN of ships is propeller ...

Paper

Predicting the higher-order harmonics of propeller-induced hull-pressure fluctuations by tip-vortex cavitation

17 okt. 2022

Cavitating propellers generate pressure fluctuations on the hull of the ship and emit underwater sound. These pressure fluctuations are usually ...

Paper

Marine propeller shaft loading analysis in moderate oblique-flow conditions

15 okt. 2022

Shaft loads of marine propellers in noncavitating oblique-flow conditions are herein investigated. The application of a Boundary Element Method ...

Paper

The SOUNDS project: towards effective mitigation of underwater noise from shipping in Europe

20 jun. 2022

Continuous underwater noise from shipping has been identified as one of the main contributors to ambient noise levels in the oceans. Notwithstanding ...

Paper

Predicting cavitating propeller noise in off-design conditions using scale-resolving CFD simulations

15 jun. 2022

There is increasing awareness about the harmful impact of underwater radiated noise of shipping on the marine environment, with propeller cavitation ...

Paper

Broadband Trailing-Edge Noise Predictions using Incompressible Large Eddy Simulations

14 jun. 2022

Incompressible large eddy simulations of the flow over an airfoil at high Reynolds number and low Mach number have been performed, including ...

Paper

Progress in the prediction and mitigation of propeller cavitation noise and vibrations

16 nov. 2020

Comfort on board passenger vessels and pleasure craft is a primary design consideration. Furthermore, underwater radiated noise from vessels is ...

Paper

The Effect of Reynolds Number on a Developed Tip-Vortex Cavity and its Radiated Noise

19 okt. 2020

It is well known that the inception of tip-vortex cavitation on wings and ship propellers is delayed in model tests when compared to sea trials due ...

Paper

Advances in design and analysis of ducted propellers for dredging vessels

22 sep. 2019

This paper addresses the challenges and advances made in the hydro-dynamic design and design evaluation of ducted propellers. The application of new ...

Magazine

Risk reduction by cavitation control

1 jun. 2019

Reading time 9 minutes

As all kinds of stakeholders regarding cavitation-related issues are represented in CRS, cavitation has been a major research topic through the CRS ...

Magazine

Propulsion design

1 jun. 2019

Reading time 9 minutes

In the year 2030, the French Naval Architect Monique Lorand was tasked to optimise a preliminary ship design in only 24 hours - a task deemed ...

Paper

Validation studies of a boundary element method for ducted propellers

26 mei 2019

This paper provides an overview of several validation studies that were carried out for a Boundary Element Method (BEM) for ducted propellers. These ...

Paper

Recent Developments in Computational Methods for the Analysis of Ducted Propellers in Open Water

5 aug. 2018

This paper presents an overview of the recent developments at IST and MARIN in applying computational methods for the hydrodynamic analysis of ...

Paper

A semi-empirical prediction method for broadband hull-pressure fluctuations and underwater radiated noise by propeller tip vortex cavitation

2 mei 2018

A semi-empirical method is presented that predicts broadband hull-pressure ﬂuctuations and underwater radiated noise due to propeller tip vortex ...

Paper

Prediction of the Open-Water Performance of Ducted Propellers with a Panel Method

19 mrt. 2018

In the present work, a comparison between the results obtained by a panel code with a Reynolds-averaged Navier-Stokes (RANS) code is made to obtain ...

Paper

Validation of underwater radiated noise predictions for a merchant vessel using full-scale measurements

27 aug. 2017

Underwater radiated noise (URN) was previously primarily of interest in connection with the signature of naval vessels. Recently it has become ...

Magazine

Supporting silent ships - measuring underwater radiated noise from cavitating ship propellers

17 aug. 2017

Reading time 6 minutes

Have you ever had problems talking to someone in a noisy environment such as a busy restaurant? The same happens to marine animals, which use sound ...

Paper

A semi-empirical method to predict broadband hull pressure fluctuations and underwater radiated noise by cavitating tip vortices

12 jun. 2017

A semi-empirical method is presented that predicts broadband hull pressure fluctuations and underwater radiated noise due to propeller tip vortex ...

Paper

Validation of computational and experimental prediction methods

4 sep. 2016

Validation of computational and experimental prediction methods for the underwater radiated noise of a small research vesselModel tests and ...

Magazine

Accurate predictions for noise levels of cavitating propellers now possible

19 aug. 2016

Reading time 6 minutes

As underwater radiated noise levels in the oceans increases, MARIN has investigated just how much cavitating propellers are to blame.

Paper

Suppression Of underwater Noise Induced by Cavitation - SONIC

18 apr. 2016

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 ...

Paper

Acoustic Reverberation Measurements in the Depressurized Wave Basin

1 okt. 2015

One method to determine the underwater radiated noise (URN) of the cavitating propeller of a ship is to perform model tests in a cavitation test ...

Paper

Influence Of Local And Adaptive Mesh Refinement On The Tip Vortex Characteristics Of A Wing And Propeller

15 jun. 2015

Two different methods to obtain nearly grid independent solutions for tip vortex flow were tested for a wing and a propeller.

Paper

Computational and Experimental Prediction of Propeller Cavitation Noise

21 mei 2015

Computational and experimental methods for the prediction of underwater-radiated noise due to propeller cavitation as in use at MARIN are discussed ...

Paper

Underwater Radiated Noise Measurements for a Cruise Ferry

25 okt. 2013

Inboard noise and underwater radiated noise are becoming more and more important factors during the design of ships. Model tests are often used to ...

Paper

Underwater radiated noise measurements with a silent towing carriage in the depressurized wave basin

1 sep. 2013

Because of the increasing interest in underwater radiated noise levels of ships, noise mitigation measures have been applied to the new secondary ...

Paper

A Comparison of Panel Method and RANS Calculations for a Ducted Propeller System in Open-Water

5 mei 2013

In this paper, a comparison between results of a panel method and a RANS solver is made for a ducted propeller system in open-water. The panel ...

Paper

Numerical simulation of propeller-hull interaction and determination of the effective wake field using a hybrid RANS-BEM approach

5 mei 2013

In this study propeller-hull interaction is investigated numerically using a combination of a steady viscous CFD method (RANS) for the ship flow and ...

Paper

Scale effects on hull pressure fluctuations due to cavitating propellers

1 okt. 2012

In this paper we describe several scale effects that may occur on cavitating propellers and the resulting (low-frequency) hull pressure ...

Paper

Analysis of scale effects in ship powering performance using a hybrid RANS-BEM approach

27 aug. 2012

This paper discusses scale effects in ship powering performance using a hybrid RANS-BEM approach. The propeller action is included in the viscous ...

Paper

Investigation of Hull Pressure Pulses, Making Use of Two Large Scale Cavitation Test Facilities

13 aug. 2012

The well-known ship model basins MARIN of The Netherlands and HSVA of Germany have joint forces to investigate the problem of the occasional ...

Magazine

Silence is golden... especially underwater

20 apr. 2012

Reading time 3 minutes

MARIN introduces a new silent towing carriage in a bid to further the industry's knowledge about underwater-radiated noise.

Paper

Open-Water Thrust and Torque Predictions of a Ducted Propeller System With a Panel Method

15 jun. 2011

This paper discusses several modelling aspects which are important for the performance predictions of a ducted propulsor with a low-order Panel ...

Paper

On Predicting Cavitation-Induced Hull Pressure Fluctuations - Wake Scale Effects And Signal Variability

24 nov. 2010

This paper presents research efforts currently made to incorporate the influence of wake scaling and signal variability in scale model experiments ...

Paper

On the influence of viscous effects on 2-D cavitating vortices

11 okt. 2010

This paper describes the influence of viscous effects on an axisymmetric cavitating vortex in 2-D viscous incompressible flow for steady and ...

Paper

Modeling and analysis of a cavitating vortex in 2D unsteady viscous flow

17 aug. 2009

Two models, of which one analytical and the other computational, have been developed to describe an axisymmetric cavitating vortex in ...

Paper

Computation of hull-pressure fluctuations due to non-cavitating propellers

24 jun. 2009

This paper describes a new coupling procedure of two boundary element methods aimed at computing propellerinduced hull-pressure fluctuations. The ...

Paper

Investigation of hull pressure fluctuations generated by cavitating vortices

22 jun. 2009

The paper describes an ongoing research program at MARIN for the investigation of low frequency hull pressure fluctuations caused by cavitating ...

Paper

Investigation of the resonance frequency of a cavitating vortex

24 apr. 2009

The cavitation pattern of a modern ship propeller is often characterized by a cavitating vortex. This cavitating vortex generates low frequency hull ...

Paper

Model Scale Measurements of Surface Ship Radiated Flow Noise

24 mrt. 2009

Advances in weapon and sensor capabilities are driving an increased interest in the control of underwater signatures of naval platforms. The control ...

Magazine

Surface Ship Radiated Flow Noise project completed

29 jan. 2009

Reading time 3 minutes

Advances in weapon and sensor capabilities are driving an increased interest in the control of underwater signatures of naval platforms.

Paper

Similarity solutions for viscous cavitating vortices

1 dec. 2008

Theoretical analysis of the dynamic behavior of cavitating vortices requires knowledge of the velocity distribution in the vortex core. For that ...

Paper

Similarity solutions for viscous cavitating vortex cores

7 jul. 2008

Theoretical analysis of the dynamic behavior of cavitating vortices requires knowledge of the velocity distribution in the vortex core. For that ...

Paper

Analysis of inertial waves on inviscid cavitating vortices in relation to low-frequency radiated noise

7 jul. 2008

The dispersion relation of inertial waves on inviscid cavitating vortices ('Kelvin waves') is reconsidered and extended to include the influence of ...

Paper

Computational Analysis of Propeller Sheet Cavitation and Propeller Ship Interaction

26 mrt. 2008

This paper describes a computational procedure which is being developed for the practical analysis of propeller sheetcavitation and propeller-ship ...

Magazine

PROCAL beats the panel!

17 okt. 2007

Reading time 6 minutes

With the increase in fuel prices, interest in efficient ship propulsors is rapidly growing but the last couple of decades an opposite trend also can ...

Paper

Broadband hull pressure fluctuations and cavitating vortices - an investigation of resonance frequencies

9 sep. 2007

This paper presents new findings obtained in an ongoing research program at MARIN, which concerns cavitating tip vortices on ship propellers and the ...

Paper

Achievements and challenges in cavitation research on ship propellers

9 mei 2007

Cavitation occurs on nearly all ship propellers. It may lead to expensive problems if not acknowledged in an early design stage. The two most ...

Paper

Modelling of three dimensional sheet cavitation on marine propellers using a boundary element method

1 sep. 2006

The current paper presents results of a research programmededicated to the analysis of cavitating marine propellers using Boundary Element Methods. ...

Paper

Cavitation Research On Ship Propellers - A Review Of Achievements And Challenges

1 sep. 2006

This paper reviews cavitation research on ship propellers performed in the recent past in MARIN’s Depressurized Towing Tank and cavitation tunnels. ...

Paper

Influence of the reduced frequency on the 2-D partial sheet cavitation behaviour for a foil in a gust

1 sep. 2006

ABSTRACT This paper presents a numerical study of the influence of the reduced frequency on the 2-D partial sheet cavitation behaviour for a foil ...

Paper

A verification study on low-order three-dimensional potential-based panel codes

9 jan. 2006

A verification study of two different panel codes for three-dimensional potential flow is performed by grid convergence studies. The two codes used ...

Paper

A study on the modeling of marine propeller tip flows using BEM

4 jul. 2005

It has been recognized that Boundary Element Methods (BEM) are able to predict the pres-sure distribution in the steady case with reasonable ...

Paper

Surface ship underwater radiated flow noise

21 jun. 2005

An increasing focus on naval operations in littoral waters and the advances in weapon and sensor capabilities are driving an increased interest in ...

Paper

Validation of a BEM for modelling steady sheet cavitation on marine propellers

1 jun. 2005

The current paper presents results obtained with a 3-D boundary element method which is being developed for the analysis of cavitating marine ...

Paper

Aspects of the cavitating propeller tip vortex as a source of inboard noise and vibration

1 jan. 2005

This paper surveys fluid dynamic-acoustic mechanisms that may explain low-frequent, broadband hull excitation experienced on board of ships and ...

Paper

Unsteady effects in 2D modelling of partial cavitation using BEM

1 jan. 2004

The authors have developed 2D steady and unsteady models for partial sheet cavitation analysis based on the Boundary Element Method (BEM). Using ...