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Author

Claudio Lugni

Bio: Claudio Lugni is an academic researcher from Norwegian University of Science and Technology. The author has contributed to research in topics: Sea state & Seakeeping. The author has an hindex of 26, co-authored 92 publications receiving 1757 citations. Previous affiliations of Claudio Lugni include Harbin Engineering University & United States Naval Research Laboratory.
Topics: Sea state, Seakeeping, Radar imaging, Solver, Radar


Papers
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Journal ArticleDOI
TL;DR: In this article, the impact of waves upon a vertical, rigid wall during sloshing is analyzed with specific focus on the modes that lead to the generation of a flip-through.
Abstract: The impact of waves upon a vertical, rigid wall during sloshing is analyzed with specific focus on the modes that lead to the generation of a flip-through [M. J. Cooker and D. H. Peregrine, “A model for breaking wave impact pressures,” in Proceedings of the 22nd International Conference on Coastal Engineering (ASCE, Delft, 1990), Vol. 2, pp. 1473–1486]. Experimental data, based on a time-resolved particle image velocimetry technique and on a novel free-surface tracking method [M. Miozzi, “Particle image velocimetry using feature tracking and Delaunay tessellation,” in Proceedings of the 12th International Symposium on Applications of Laser Techniques to Fluid Mechanics (2004)], are used to characterize the details of the flip-through dynamics while wave loads are computed by integrating the experimental pressure distributions. Three different flip-through modes are observed and studied in dependence on the amount and modes of air trapping. No air entrapment characterizes a “mode (a) flip-through,” engulfm...

174 citations

Journal ArticleDOI
TL;DR: The results show a satisfactory agreement between the δ-SPH model, the BEM-MEL solver and the experiments, and the influence of the weakly-compressibility assumption on the SPH results is inspected.

126 citations

Journal ArticleDOI
TL;DR: The reliability of the proposed procedure is shown by a numerical analysis with synthetic data, and some preliminary results with experimental data collected by a radar on a moving ship are presented.
Abstract: This letter deals with the sea state monitoring starting from marine radar images in the X-band. For such a topic, one of the key factors affecting the reliability of reconstruction procedure is the determination of the equivalent surface current that also accounts for the velocity of a moving ship. In this letter, we propose a method to evaluate the surface current, particularly for large values. The reliability of the proposed procedure is shown by a numerical analysis with synthetic data. Subsequently, we present some preliminary results with experimental data collected by a radar on a moving ship.

87 citations

Journal ArticleDOI
TL;DR: In this article, the impact duration at the wall is almost independent of its height above the undisturbed surface level, but its intensity rapidly decreases in the body of the fluid (the peak pressure halves within the first two compression/expansion cycles).
Abstract: The present paper on wave-impact events in depressurized environments completes the analysis of Part I by focusing on the dynamical features of the impacts and on the influence of the ambient pressure. Connection is made between the impact regimes typically described in the literature and the stages described in Part I [C. Lugni, M. Miozzi, M. Brocchini, and O. M. Faltinsen, “Evolution of the air cavity during a depressurized wave impact. I. The kinematic flow field,” Phys. Fluids 22, 056101 (2010)]. The stages of isotropic/anisotropic compression and expansion of the air cavity are of particular interest. The impact duration at the wall is almost independent of its height above the undisturbed surface level, but its intensity rapidly decreases in the body of the fluid (the peak pressure halves within the first two compression/expansion cycles). The time evolution of the pressure loads on the wall is analyzed by means of the Hilbert transform and an empirical mode decomposition of the signals. This enable...

83 citations

Journal ArticleDOI
TL;DR: In this paper, the role of the ambient pressure on wave impact events in depressurized environments was investigated. But the authors focused on the topological and kinematic aspects of the wave impact and its evolution toward collapse into a mixture of water and air bubbles.
Abstract: This paper describes a systematic experimental study of the role of the ambient pressure on wave impact events in depressurized environments. A wave impact event of “mode (b)” [see Lugni et al., “Wave impact loads: The role of the flip-through,” Phys. Fluids 18, 122101 (2006)] causes entrapment of an air cavity. Here the topological and kinematic aspects of its oscillation and evolution toward collapse into a mixture of water and air bubbles are studied, while Part II [Lugni et al., “Evolution of the air cavity during a depressurized wave impact. II. The dynamic field,” Phys. Fluids 22, 056102 (2010)] focuses on the dynamic features of the flow. Four distinct stages characterize the flow evolution: (1) the closure of the cavity onto the wall, (2) the isotropic compression/expansion of the cavity, (3) its anisotropic compression/expansion, and (4) the rise of the cavity up the wall. The first two stages are mainly governed by the air leakage, the last two by the surrounding hydrodynamic flow, which contrib...

74 citations


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Book
09 Jan 2006
TL;DR: In this paper, the authors describe a planing vessel with wave resistance and propulsion, and planing vessels with planing, whipping, and springing, as well as a semi-displacement vessel.
Abstract: 1. Introduction 2. Resistance and propulsion 3. Waves 4. Wave resistance and wash 5. Surface effect ships 6. Hydrofoil vessels and foil theory 7. Semi-displacement vessels 8. Slamming, whipping and springing 9. Planing vessels 10. Manoeuvring Appendix References Index.

457 citations

Journal ArticleDOI
TL;DR: A novel system of equations has been defined which contains diffusive terms in both the continuity and energy equations and, at the leading order, coincides with a standard weakly-compressible SPH scheme with artificial viscosity, showing to be robust, efficient and accurate.

413 citations

01 Nov 2016
TL;DR: In this article, a book that can be recommended for new readers is dynamics and modelling of ocean waves, which is not kind of difficult book to read and can be read and understand by the new readers.
Abstract: Preparing the books to read every day is enjoyable for many people. However, there are still many people who also don't like reading. This is a problem. But, when you can support others to start reading, it will be better. One of the books that can be recommended for new readers is dynamics and modelling of ocean waves. This book is not kind of difficult book to read. It can be read and understand by the new readers.

306 citations

Journal ArticleDOI
TL;DR: Specific focus has been given to the theoretical analysis of the diffusive term structure, highlighting the main benefits and drawbacks of the most widespread formulations.

305 citations

Journal ArticleDOI
TL;DR: In this article, the authors summarize the motivations behind utilizing the smoothed particle hydrodynamics (SPH) method in an industrial context, as well as deriving general conclusions regarding its assets and limitations and stressing the remaining challenges in order to make it an hand-on computational tool.

296 citations