ISP Journal issues

ISP logoOn this page, you will find short summaries of the articles included in the relevant editions of ISP Journal, per year and quarterly edition.
With each article you will find a link to the IOS press website, where you can read more about that article and the relevant edition and how to order it.

 

Back to the ISP Journal introduction page.

ISP Volume 63, nrs 3 and 4

ISP logoOn this page, you will find short summaries of the articles included in the relevant editions of ISP Journal, per year and quarterly edition.
With each article you will find a link to the IOS press website, where you can read more about that article and the relevant edition and how to order it.

 

Back to the ISP Journal introduction page.

ISP Volume 63, numbers 3,4 of 2016/2017 is a special issue about the European Union (EU) project GRIP. GRIP stands for “Green Retrofitting through optimization of hull-Propulsion Interaction”. The project addressed several aspects of fitting Energy Saving Devices (ESD’S) to existing ships.

Aspects that were addressed are among others: the working principles of ESD’s, the development of an Early Assessment Tool (EAT) to estimate the energy saving potential of a specific ESD to a specific ship, structural aspects (loads, fatigue and vibrations), and the shipyard process to fit an ESD to a ship of which the hull geometry is not exactly known. Within the project a specific ESD has been designed, built and tested on full scale.

This ISP issue contains 9 articles, covering all aspects from estimating the power saving potential to the actual design and construction of ESD’s, fitting them to a ship and testing tem on full scale.

Summaries, as well as the complete contents of the articles included in ISP Volume 63, numbers 3,4 can be found via the IOS Press website via this link 

Back to the ISP Journal introduction page.

ISP Volume 64, nrs 1 and 2

ISP Volume 64, issue 1-2 of 2017 contains 6 articles on various topics. These range from applying RANS CFD methods to predict ship propulsive performance, to application of laminated glass in the yacht industry, ship stability during launching when applying pneumatic airbags, sloshing in LNG tanks and mitigation of bubble sweep down from a ship’s bow. Brief summaries of these articles are provided below. More extensive summaries, as well as the full articles can be found on https://content.iospress.com/journals/international-shipbuilding-progress/64/1-2.


Three-dimensional RANS method to numerically solve ship’s wave-making resistance compared with the Rankine source method

3D RANS

This article describes the application of a three-dimensional RANS CFD method to calculate the wave-making resistance of a Wigley hull and a Series 60 hull. The results are compared to results of calculations by a Rankine source boundary element method and results of model tests.

The here shown Illustration is reprinted from ISP, Vol number 64, Jun-ming Hu, Tie-li Li, Yan Lin, Guan Guan and Zhuo-shang Ji, Three-dimensional RANS method to numerically solve ship’s wave-making resistance compared with the Rankine source method, Pages No. 1-23, Copyright (2017), with permission from IOS Press.

 This publication is available at IOS Press through this link.


On the damping coefficient of laminated glass for yacht industry

Damping coefficient of glass

Very large glass surfaces, that are more and more applied on yachts, are critical elements as regards the assessment of the ship’s noise and vibration characteristics. This makes the laminated glass dynamic characterization a fundamental issue to be investigated. The article describes different experimental modal methods to obtain the damping coefficient at natural frequencies, applied to laminated glass specimens. The results of these methods are compared with each other.

The shown Illustration is reprinted from ISP, Vol number 64, D. Boote, T. Pais, G. Vergassola, A. Tonelli and L. Gragnani, On the damping coefficient of laminated glass for yacht industry, Pages No. 25-40, Copyright (2017), with permission from IOS Press.

This publication is available at IOS Press via this link


Ship stability analysis during launching from longitudinal sloping slipway by pneumatic airbags

This article presents a new analysis method of taking into account the possibility of a tanker tipping during launching on pneumatic airbags. Launching calculations and diagrams for both the traditional and pneumatic airbags launching are presented along with a comparative analysis of the two launching methods.

This publication is available at IOS Press via this link


 

Prediction of ship power and speed performance based on RANS method

Speedpower RANS

This article describes the application of CFD RANS methods to calculate the open water performance of a ducted propeller model for a fishing vessel, the resistance of the model of this vessel and the propulsive performance of this ship model when fitted with the subject propeller model. The results are compared with results of model tests.

The Illustration is reprinted from ISP, Vol number 64, Jun-ming Hu, Tie-li Li, Yan Lin, Guan Guan and Zi-bo Zheng, Prediction of ship power and speed performance based on RANS method, Pages No. 51-78, Copyright (2017), with permission from IOS Press.

This publication is available at IOS Press via this link.

 


A numerical technique for sloshing in an independent type C LNG tank with experimental investigation and validation

LNG Sloshing

Sloshing induced by partial loading is violent when a resonance condition occurs. Given strong nonlinearity, rapid and accurate prediction of sloshing loads under resonance conditions is the key factor in the design of LNG cargo tanks.
This article describes the application of a CFD technique to simulate sloshing, and experiments conducted to verify the results of the simulations. The results of both approaches are compared to each other.

This Illustration is reprinted from ISP, Vol number 64, Ge Liu, Yan Lin, Guan Guan and Yan-yun Yu, A numerical technique for sloshing in an independent type C LNG tank with experimental investigation and validation, Pages No. 79-100, Copyright (2017), with permission from IOS Press.

This publication is available at IOS Press via this link


Dydrodynamic design for mitigation of bubble sweep down in sonar mounted research vessels

Bubble sweep

 

Oceanographic research vessels are fitted with acoustic sonar transducers at the bottom keel region.
Bubbles that are swept down from the bow region interfere with the acoustic transmission and deteriorate the functioning of the sonar transducer. This article describes the development of a special bow shape, due to which the path of swept down bubbles is diverted away from the acoustic sonar transducer. This development includes the application of RANS CFD and experiments on model scale..

This Illustration is reprinted from ISP, Vol number 64, M. Palaniappan and V. Anantha Subramanian, Hydrodynamic design for mitigation of bubble sweep down in sonar mounted research vessels, Pages No. 101-126, Copyright (2017), with permission from IOS Press.

This publication is available at IOS Press via this link


ISP Volume 65, nr 1

ISP Volume 65, issue 1 of 2018 contains 4 articles on various topics. These range from an experimental analysis of the seakeeping performance of catamaran forms with bulbous bows to a multiaxial fatigue assessment of welded joints in marine structures, a hydrostatic analyses of uprighting processes of capsized and damaged ships and wind-tunnel experiments on a aerodynamic interaction between two ridid sails used for wind assisted propulsion.
Summaries of these articles are provided below. These summaries, as well as the full articles can be found on https://content.iospress.com/journals/international-shipbuilding-progress/65/1 .


Experimental analysis of the seakeeping performance of catamaran forms with bulbous bows

Authors: Abdul Ghani, Pauzi| Wilson, Philip

Abstract: This paper explores the effects of adding different forms of bulbous bows onto catamaran hulls and assesses the implications on the seakeeping performance. There has been a large body of work that assess’ the effect of wave wake wash and recently studies have been undertaken to determine the effects of bulbous bows on reducing wave wake wash. However, not much research has been published on the effects of bulbous bows on the seakeeping performance of catamarans fitted with bulbous bows. This paper presents experimental results that will allow a ship designer to understand the effects of bulbous bows on heave, pitch and added resistance in waves. In conclusion it ranks the importance of different bulbous bows on the seakeeping performance.

This publication is available at IOS Press through this link


Multiaxial fatigue assessment of welded joints in marine structures

Authors: van Lieshout, P.S.| den Besten, J.H. | Kaminski, M.L.

Abstract: Structural geometry and stochastic loads such as swell and wind seas can typically induce multiaxial stress states in welded details of marine structures. It is known that such complex time varying stress states determine the fatigue resistance of welded steel joints. Therefore, it is of importance to account for them in fatigue lifetime estimation. Over the past few decades a wide variety of design guidelines and methods have been developed for multiaxial fatigue assessment, but so far there does not exist a general hypothesis applicable to all possible load cases. This study provides an overview of the current state-of-the-art in academia and engineering practice in terms of multiaxial fatigue assessment, and is focusing on the application to welded joints in marine structures. The progress of different approaches and methods is elaborated and commented upon, taking their hypothesis and (physical) basis into consideration. The insights that are provided in this paper form a valuable foundation for future investigations and emphasize the necessity of experimental proofs and model validation.

This publication is available at IOS Press through this link


Hydrostatic analyses of uprighting processes of a capsized and damaged ship

Abstract: In the process of marine salvage, the capsized ship is normally required to go through a process of righting firstly, which essentially means bringing the deck to point upwards. Calculation of the righting force is the key to achieving success in designing schemes. At present, the righting force calculation relies on the use of empirical formulae. However, their accuracy and reliability is not high. In this paper, a mathematical model of the flooding quantity and righting force was established based on the hydrostatic theory applied to the ship. A three-dimensional ship model was built via General Hydrostatics software (GHS) to simulate the uprighting process of a capsized and damaged ship. Four typical uprighting processes concerning capsized ships were simulated, namely the case where about 50% of the superstructure volume was filled with water (Case 1), where about 50% of the engine room volume was filled with water (Case 2), where the superstructure was detached (Case 3) and where a large amount of air in the damaged compartments existed (Case 4). Simulation results show that the proportion between the maximum righting moment and the maximum righting moment in the opposite direction is 0.459, 0.486, 0.424 and 0.346 for cases A, B, C and D, respectively. So a larger righting force moment in the opposite direction is needed to prevent the ship from being damaged again or from capsizing again. The shear force is not always increasing with the flooding quantity or displacement. The effect of flooding water distribution is more obvious than the flooding quantity and displacement for a ship with many damaged compartments when the trim angle variation is very small. Thus, the righting force can be efficiently reduced by designing reasonable uprighting schemes.

This publication is available at IOS Press through this link


Wind-tunnel experiments on the aerodynamic interaction between two rigid sails used for wind-assisted propulsion

This publication is available at IOS Press through this link


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