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Propulsion of Ships in Waves
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Propulsion of Ships in Waves

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (5 November 2020) | Viewed by 10642

Special Issue Editor

Prof. Dr. George D. Tzabiras

E-Mail Website
Guest Editor
School of Naval Architecture and Marine Engineering, National Technical University of Athens, Athens, Greece
Interests: computational and experimental ship hydrodynamics

Special Issue Information

Dear Colleagues,

The study of the propulsive characteristics of ships moving in waves (regular or random seas) is of major importance since it is directly related to the fuel consumption and their overall energy efficiency. For designers, the ultimate goal should be a computational tool that predicts the real situation of a full-scale self-propelled ship. However, this is an extremely complicated task which also requires excessive computing power. This is why, in practice, many simplified methods have been employed, based on empirical methods, lower order computational tools or advanced CFD codes in order to explore issues regarding the engine–propeller–hull interaction. Many of them are based on the analysis of in situ measurements or towing tank experiments. The purpose of this invited Special Issue is to present relevant approaches which exhibit high interest for the ship-building industry, the scientific community and engineers involved in ship operation management.

Prof. George D. Tzabiras
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Ship propulsion
  • Seakeeping
  • Added resistance
  • Propeller performance
  • Propeller–hull interaction
  • Engine–propeller interaction
  • CFD
  • Tank tests
  • In situ measurements

Published Papers (3 papers)

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Research

24 pages, 11656 KiB  
Article
On the Calculation of Propulsive Characteristics of a Bulk-Carrier Moving in Head Seas
by S. Polyzos and G. Tzabiras
J. Mar. Sci. Eng. 2020, 8(10), 786; https://doi.org/10.3390/jmse8100786 - 09 Oct 2020
Cited by 4 | Viewed by 2394
Abstract
The present work describes a simplified Computational Fluid Dynamics (CFD) approach in order to calculate the propulsive performance of a ship moving at steady forward speed in head seas. The proposed method combines experimental data concerning the added resistance at model scale with [...] Read more.
The present work describes a simplified Computational Fluid Dynamics (CFD) approach in order to calculate the propulsive performance of a ship moving at steady forward speed in head seas. The proposed method combines experimental data concerning the added resistance at model scale with full scale Reynolds Averages Navier–Stokes (RANS) computations, using an in-house solver. In order to simulate the propeller performance, the actuator disk concept is employed. The propeller thrust is calculated in the time domain, assuming that the total resistance of the ship is the sum of the still water resistance and the added component derived by the towing tank data. The unsteady RANS equations are solved until self-propulsion is achieved at a given time step. Then, the computed values of both the flow rate through the propeller and the thrust are stored and, after the end of the examined time period, they are processed for calculating the variation of Shaft Horsepower (SHP) and RPM of the ship’s engine. The method is applied for a bulk carrier which has been tested in model scale at the towing tank of the Laboratory for Ship and Marine Hydrodynamics (LSMH) of the National Technical University of Athens (NTUA). Full article
(This article belongs to the Special Issue Propulsion of Ships in Waves)
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32 pages, 9964 KiB  
Article
Free-Surface Effects on the Performance of Flapping-Foil Thruster for Augmenting Ship Propulsion in Waves
by Evangelos S. Filippas, George P. Papadakis and Kostas A. Belibassakis
J. Mar. Sci. Eng. 2020, 8(5), 357; https://doi.org/10.3390/jmse8050357 - 19 May 2020
Cited by 27 | Viewed by 3284
Abstract
Flapping foils located beneath or to the side of the hull of the ship can be used as unsteady thrusters, augmenting ship propulsion in waves. The basic setup is composed of a horizontal wing, which undergoes an induced vertical motion due to the [...] Read more.
Flapping foils located beneath or to the side of the hull of the ship can be used as unsteady thrusters, augmenting ship propulsion in waves. The basic setup is composed of a horizontal wing, which undergoes an induced vertical motion due to the ship’s responses in waves, while the self-pitching motion of the wing is controlled. Flapping foil thrusters can achieve high level of thrust as indicated by measurements and numerical simulations. Due to the relatively small submergence of the above biomimetic ship thrusters, the free-surface effects become significant. In the present work, the effect of the free surface on the performance of flapping foil thruster is assessed by means of two in-house developed computational models. On one hand, a cost-effective time-domain boundary element method (BEM) solver exploiting parallel programming techniques and general purpose programming on graphics processing units (GPGPU) is employed, while on the other hand a higher fidelity RANSE finite volume solver implemented for high performance computing (HPC) is used, and comparative results are presented. BEM and RANSE calculations present quite similar trends with respect to mean submergence depth, presenting 12%, 28%, and 18% of differences concerning the mean values of lift, thrust, and moment coefficients, respectively. The latter differences become very small after enhancement of the BEM model to include viscous corrections. Useful information and data are derived supporting the design of the considered biomimetic thrusters, for moderate submergence depths and conditions characterized by minor flow separation effects. Full article
(This article belongs to the Special Issue Propulsion of Ships in Waves)
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20 pages, 12800 KiB  
Article
Numerical Investigation of the Semi-Active Flapping Foil of the Wave Glider
by Zhanfeng Qi, Bo Zou, Huiqiang Lu, Jian Shi, Guofu Li, Yufeng Qin and Jingsheng Zhai
J. Mar. Sci. Eng. 2020, 8(1), 13; https://doi.org/10.3390/jmse8010013 - 24 Dec 2019
Cited by 19 | Viewed by 3242
Abstract
A numerical investigation is conducted to study the propulsive performance of the semi-active flapping foil of the wave glider, where the heaving smotion is fully prescribed, and the pitching motion is determined by the hydrodynamic force and torsion spring. A mesh for two-dimensional [...] Read more.
A numerical investigation is conducted to study the propulsive performance of the semi-active flapping foil of the wave glider, where the heaving smotion is fully prescribed, and the pitching motion is determined by the hydrodynamic force and torsion spring. A mesh for two-dimensional NACA0012 foil with the Reynolds number Re = 42000 is produced, and a dynamic mesh and sliding interface are used in the computation. The influences of reduced frequency, spring stiffness, and critical pitching amplitude on the hydrodynamic characteristics of semi-active flapping foil are systematically investigated. We find that there is a critical reduced frequency: When the reduced frequency is lower than the critical value, the propulsive performance of flapping foil can be improved exponentially, and when the reduced frequency is higher than the critical value, the semi-active flapping foil cannot provide an effective thrust. For a greater reduced frequency, there is an optimal spring stiffness value, which corresponds to the maximum value of the output power coefficient. For a lower reduced frequency, the mean value of the output power coefficient monotonically decreases as the spring stiffness increases. We also notice that the propulsive efficiency of flapping foil monotonically decreases as the spring stiffness increases. Finally, we find that the appropriate critical pitching amplitude can improve the propulsive performance of semi-active flapping foil, especially for greater heaving amplitudes. Full article
(This article belongs to the Special Issue Propulsion of Ships in Waves)
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