Searched for: mods_note_research_group_s:"Ship%5C+Hydromechanics%5C+and%5C+Structures"
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de Wilde, J.J. (author)
The objective of the research was the measurement of the VIV lift force coefficient in-phase with velocity Clv and in-phase with acceleration Cla for a pipe section with large length over diameter ratio of L/D ~18 at high Reynolds numbers of Re > 1E4. The coefficients are measured for a forced oscillation pipe in a steady flow and can be...
doctoral thesis 2020
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Bordogna, G. (author)
The shipping industry is currently under pressure to reduce its pollutant emissions and, thus, to alleviate its negative impact on the environment and human health. With this aim, in the last years, the International Maritime Organization issued significant measures to improve the energy efficiency of ships (see the Energy Efficiency Design...
doctoral thesis 2020
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van Lieshout, P.S. (author)
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...
doctoral thesis 2020
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Damala, Dimitra (author), Verbaas, Frans (author), Bonci, M. (author), Akkerman, I. (author), Hopman, J.J. (author)
What it is Broaching-to?<br/>When it can occur?<br/>What can happen if it happens?<br/>What is known about it?<br/>How it can be investigated further?<br/>Practical ways to prevent it in design and in operation
report 2020
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Bonci, M. (author), de Jong, Pepijn (author), van Walree, Frans (author), Renilson, Martin (author), Keuning, J.A. (author), van 't Veer, A.P. (author)
The coupling between heel and the loads in the horizontal plane is usually neglected in manoeuvrability studies. However, the heel–sway and heel–yaw coupling can play an important role in potentially unsafe conditions, such as in a following sea. In these conditions, small fast vessels experience dynamic instabilities which threaten their...
journal article 2020
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Akkerman, I. (author), Meijer, J. H.A. (author), ten Eikelder, M.F.P. (author)
This paper presents a novel variational formulation to simulate linear free-surface flow. The variational formulation is suitable for higher-order finite elements and higher-order and higher-continuity shape functions as employed in Isogeometric Analysis (IGA). The novel formulation combines the interior and free-surface problems in one...
journal article 2020
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ten Eikelder, M.F.P. (author), Bazilevs, Y. (author), Akkerman, I. (author)
In this paper we show that the variational multiscale method together with the variation entropy concept form the underlying theoretical framework of discontinuity capturing. The variation entropy [M.F.P. ten Eikelder and I. Akkerman, Comput. Methods Appl. Mech. Engrg. 355 (2019) 261-283] is the recently introduced concept that equips total...
journal article 2020
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Maljaars, P.J. (author), Grasso, N. (author), den Besten, J.H. (author), Kaminski, M.L. (author)
The first part of the paper presents a partitioned fluid–structure interaction (FSI) coupling for the non-uniform flow hydro-elastic analysis of highly flexible propellers in cavitating and non-cavitating conditions. The chosen fluid model is a potential flow solved with a boundary element method (BEM). The structural sub-problem has been...
journal article 2020
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van der Horst, M.P. (author), Kaminski, M.L. (author)
The metal magnetic memory method is a novel technique for monitoring fatigue cracks in steel structures, which can reduce operational expenses and increase safety by minimizing inspections. The crack geometry can be identified by measuring the self magnetic flux leakage, which is induced by the Earth’s magnetic field and the permanent...
journal article 2020
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Wellens, P.R. (author), Borsboom, Mart (author)
The boundaries of numerical domains for free-surface wave simulations with marine structures generate spurious wave reflection if no special measures are taken to prevent it. The common way to prevent reflection is to use dissipation zones at the cost of increased computational effort. On many occasions, the size of the dissipation area is...
journal article 2020
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Peters, O.A.J. (author)
Dry transporting large heavy floating structures has been an important development in the innovative history of Heavy Marine Transport. This is done by carrying these type of cargoes on the deck of Heavy Transport Vessels. Loading and discharge is preformed by submerging the transport vessel, and positioning the cargo above the deck using tugger...
doctoral thesis 2019
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Bonci, M. (author)
Broaching-to is a highly complex, non-linear dynamic instability event that several vessels might face when sailing in the same direction of the waves, for example when returning to port during a storm. This condition is referred to as following sea. Vessels such high-speed craft but also patrol and rescue boats, fishing trawlers or small...
doctoral thesis 2019
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Maljaars, P.J. (author)
Higher efficiencies, higher cavitation inception speeds and reduced acoustic signature are claimed benefits of flexible composite propellers. Analysing the hydrodynamic performance of these flexible propellers, implies that a coupled fluid-structure interaction (FSI) computation has to be performed. An FSI coupling can be monolithic, which means...
doctoral thesis 2019
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ten Eikelder, M.F.P. (author), Akkerman, I. (author)
This paper presents the notion of a variation entropy. This concept is an entropy framework for the gradient of the solution of a conservation law instead of on the solution itself. It appears that all semi-norms are admissible variation entropies. This provides insight into the total variation diminishing property and justifies it from...
journal article 2019
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Akkerman, I. (author), ten Eikelder, M.F.P. (author)
This paper presents a new monolithic free-surface formulation that exhibits correct kinetic and potential energy behavior. We focus in particular on the temporal energy behavior of two-fluids flow with varying densities. Correct energy behavior here means that the actual energy evolution of the numerical solution matches the evolution as...
journal article 2019
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Maljaars, P.J. (author), Kaminski, M.L. (author), den Besten, J.H. (author)
A special type of fluid–structure interaction (FSI) problems are problems with periodic boundary conditions like in turbomachinery. The steady state FSI response of these problems is usually calculated with similar techniques as used for transient FSI analyses. This means that, when the fluid and structure problem are not simultaneously...
journal article 2019
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Schenke, S. (author), Melissaris, T. (author), van Terwisga, T.J.C. (author)
This study presents a novel physical model to convert the potential energy contained in vaporous cavitation into local surface impact power and an acoustic pressure signature caused by the violent collapse of these cavities in a liquid. The model builds on an analytical representation of the solid angle projection approach by Leclercq et al. ...
journal article 2019
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Helgedagsrud, Tore (author), Akkerman, I. (author), Bazilevs, Yuri (author), Mathisen, Kjell (author), Øiseth, Ole (author)
Computational fluid dynamics (CFD) and fluid–structure interaction (FSI) are growing disciplines in the aeroelastic analysis and design of long-span bridges, which, with their bluff body characteristics, offer major challenges to efficient simulation. In this paper, we employ isogeometric analysis (IGA) based on nonuniform rational B-splines ...
journal article 2019
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Schreier, S. (author), Cornel, W.A. (author), Poelma, C. (author)
The dynamic response of pressure sensors for model tests of sloshing impacts is paramount to recording these highly dynamic events. In this study, we investigated the dynamic behavior of the new pressure sensors presented at ISOPE 2018 (Schreier and Poelma, 2018), which increased the spatial resolution of sloshing pressure measurements by a...
conference paper 2019
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van der Horst, Menno (author), van Kreveld, Sylvia (author), Kaminski, M.L. (author)
Wireless crack monitoring on ships and offshore structures based on Self Magnetic Flux Leakage (SMFL) measurements is a promising method to guarantee the structural integrity in a more effective way, leading to reduced operational costs and increased safety. For accurate crack sizing, the SMFL measurements must be interpreted correctly, also...
journal article 2019
Searched for: mods_note_research_group_s:"Ship%5C+Hydromechanics%5C+and%5C+Structures"
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