Browsing NTNU Open by Author "Lugni, Claudio"
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The fish ability to accelerate and suddenly turn in fast maneuvers
Paniccia, Damiano; Graziani, Giorgio; Lugni, Claudio; Piva, Renzo (Peer reviewed; Journal article, 2022)Velocity burst and quick turning are performed by fish during fast maneuvers which might be essential to their survival along pray–predator encounters. The parameters to evaluate these truly unsteady motions are totally ... -
Fish-Inspired Propulsion Study: Numerical Hydrodynamics of Rigid/Flexible/Morphing Foils and Observations on Real Fish
Xu, Huili (Doctoral theses at NTNU;2023:7, Doctoral thesis, 2023)Many swimming fishes in nature have been endowed with high hydrodynamic efficiency and performance, such as low resistance, high speed, and good maneuverability, both when swimming individually and in groups, i.e., using ... -
Free-Surface Tracking in 2D with the Harmonic Polynomial Cell Method: Two Alternative Strategies
Hanssen, Finn Christian W.; Bardazzi, Andrea; Lugni, Claudio; Greco, Marilena (Journal article, 2017)Several cases of nonlinear-wave propagation are studied numerically in two dimensions within the framework of potential flow. The Laplace equation is solved with the Harmonic Polynomial cell (HPC) method, which is a field ... -
Global force and moment in rectangular tanks through a modal method for wave sloshing
Antuono, Matteo; Lugni, Claudio (Journal article, 2017)Basing on a modal description of the sloshing phenomenon, formulas for the global force and moment acting on two-dimensional rectangular tanks are proposed. These are extensively validated through comparison with experimental ... -
How Free Swimming Fosters the Locomotion of a Purely Oscillating Fish-like Body
Paniccia, Damiano; Padovani, Luca; Graziani, Giorgio; Lugni, Claudio; Piva, Renzo (Journal article, 2023)The recoil motions in free swimming, given by lateral and angular rigid motions due to the interaction with the surrounding water, are of great importance for a correct evaluation of both the forward locomotion speed and ... -
Hydroelastic slamming response in the evolution of a flip-through event during shallow-liquid sloshing
Lugni, Claudio; Bardazzi, A.; Faltinsen, Odd Magnus; Graziani, G. (Journal article; Peer reviewed, 2014) -
Hydroelastic slamming response in the evolution of a flip-through event during shallow-liquid sloshing
Lugni, Claudio; Faltinsen, Odd Magnus; Bardazzi, A.; Graziani, G. (Journal article; Peer reviewed, 2014)The evolution of a flip-through event [6] upon a vertical, deformable wall during shallow-water sloshing in a 2D tank is analyzed, with specific focus on the role of hydroelasticity. An aluminium plate, whose dimensions ... -
Influence of motion coupling and nonlinear effects on parametric roll for a floating production storage and offloading platform
Greco, Marilena; Lugni, Claudio; Faltinsen, Odd Magnus (Journal article; Peer reviewed, 2015)Occurrence and features of parametric roll (PR) on a weather-vaning floating production storage and offloading (FPSO) platform with a turret single-point mooring-line system are examined. The main focus is on the relevance ... -
Influence of Rigid/Deformable Foil Shape on the Hydrodynamic Loads and Performance
XU, HUILI; Greco, Marilena; Lugni, Claudio (Chapter, 2022) -
Influence of yaw-roll coupling on the behavior of a FPSO: An experimental and numerical investigation
Lugni, Claudio; Greco, Marilena; Faltinsen, Odd Magnus (Journal article; Peer reviewed, 2015)An inconvenience in the experimental set-up of a FPSO in regular waves highlighted occurrence of parametric-roll events promoted by yaw-roll coupling and motivated a combined physical and numerical analysis on the relevance ... -
Nonlinear vertical accelerations of a floating torus in regular waves
Li, Peng; Faltinsen, Odd Magnus; Lugni, Claudio (Journal article; Peer reviewed, 2016)The longitudinal motions and vertical accelerations of a floating torus as well as wave motion inside the torus are studied by model tests in regular deep-water waves. Comparisons are made with linear and partly with ... -
Numerical and Experimental Study on the Parametric Roll Resonance for a Fishing Vessel with and without forward speed
Ghamari, Isar; Greco, Marilena; Faltinsen, Odd Magnus; Lugni, Claudio (Peer reviewed; Journal article, 2020)The parametric resonance in roll motion (known shortly as parametric roll) was studied for a fishing vessel in regular waves. This is an instability and resonance phenomenon that can lead the roll to reach very high ... -
Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO
Greco, Marilena; Lugni, Claudio; Colicchio, Giuseppina; Faltinsen, Odd Magnus (Chapter; Peer reviewed, 2015)This research activity represents the logical continuation of the work documented in [1] and [2] on water on deck and parametric roll for an FPSO in regular waves. Here the same numerical method, based on a domain-decomposition ... -
Numerical Study of Parametric Roll on a Fishing Vessel
Greco, Marilena; Lugni, Claudio (Chapter; Peer reviewed, 2013)Present research activity examines numerically the occurrence of parametric roll on a fishing vessel interacting with regular head-sea waves. The adopted solver is an efficient 3-D numerical Domain-Decomposition strategy ... -
On a layer model for spilling breakers: a preliminary experimental analysis
Lucarelli, Alessia; Lugni, Claudio; Falchi, Massimo; Felli, Mario; Brocchini, Maurizio (Journal article; Peer reviewed, 2018)Accurate and reliable experimental data of a sloshing-induced, rapidly-evolving spilling breaker, are used to understand the specific physics of this phenomenon and to partially evaluate a simplified analytical model by ... -
On the role of added mass and vorticity release for self-propelled aquatic locomotion
Paniccia, D.; Graziani, G.; Lugni, Claudio; Piva, R. (Peer reviewed; Journal article, 2021)Aquatic locomotion of a deformable body from rest up to its asymptotic speed is given by the unsteady motion which is produced by a series of periodic reactions dictated by the body configuration and by the style of swimming. ... -
Parametric Resonance of a Fishing Vessel With and Without Anti-Roll Tank: An Experimental and Numerical Study
Ghamari, Isar; Greco, Marilena; Faltinsen, Odd Magnus; Lugni, Claudio (Chapter; Peer reviewed, 2017)Parametric resonance (PR) in roll is of concern for fishing vessels, especially in head-sea waves. Here the effect of passive anti-roll free-surface tank is investigated experimentally and numerically on realistic ... -
The relevance of recoil and free swimming in aquatic locomotion
Paniccia, Damiano; Graziani, G.; Lugni, Claudio; Piva, Renzo (Peer reviewed; Journal article, 2021)The study of the free swimming of undulating bodies in an otherwise quiescent fluid has always encountered serious difficulties for several reasons. When considering the full system, given by the body and the unbounded ... -
Roll-yaw coupling effects on parametric resonance for a ship in regular waves
Greco, Marilena; Lugni, Claudio; Faltinsen, Odd Magnus (Chapter, 2014)This work represents a further step of the physical study documented by Greco and Lugni (2012b) and Greco et al. (2014). Three-dimensional experiments have been performed on a FPSO model in regular waves to investigate the ... -
Scaling laws for the water entry of a three-dimensional body
Lugni, Claudio; Wang, Jingbo; Faltinsen, Odd Magnus; Bardazzi, Andrea; Lucarelli, Alessia; Duan, Wenyang (Peer reviewed; Journal article, 2021)The present experimental investigation is a new way of conducting tests on model scale and of interpreting the results for the water entry of a free-falling conical body shape entrapping an air cavity. A three-dimensional ...