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On the Trajectory of a Light Small Rigid Body in an Incompressible Viscous Fluid

Bravin, M. (author), Nečasová, Šárka (author)

In this paper, we study the dynamics of a small rigid body in a viscous incompressible fluid in dimension two and three. More precisely we investigate the trajectory of the rigid body in the limit when its mass and its size tend to zero. We show that the velocity of the center of mass of the rigid body coincides with the background fluid...

journal article 2024

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An Aero-Structural Model for Ram-Air Kite Simulations

Thedens, Paul (author), Schmehl, R. (author)

Similar to parafoils, ram-air kites are flexible membrane wings inflated by the apparent wind and supported by a bridle line system. A major challenge in estimating the performance of these wings using a computer model is the strong coupling between the airflow around the wing and the deformation of the membrane structure. In this paper, we...

journal article 2023

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Finding Dangerous Waves-Review of Methods to Obtain Wave Impact Design Loads for Marine Structures

van Essen, S.M. (author), Seyffert, Harleigh C. (author)

Green water and slamming wave impacts can lead to severe damage or operability issues for marine structures. It is therefore essential to consider their probability and loads in design. This is difficult, as impacts are both hydrodynamically complex and relatively rare. The complexity requires high-fidelity modeling (experiments or CFD),...

journal article 2023

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Fast Aero-Structural Model of a Leading-Edge Inflatable Kite

Cayon, O. (author), Gaunaa, Mac (author), Schmehl, R. (author)

Soft-wing kites for airborne wind-energy harvesting function as flying tensile membrane structures, each of whose shape depends on the aerodynamic load distribution and vice versa. The strong two-way coupling between shape and loading poses a complex fluid-structure interaction problem. Since computational models for such problems do not yet...

journal article 2023

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Rapid flapping and fibre-reinforced membrane wings are key to high-performance bat flight

Lauber, M. (author), Weymouth, Gabriel D. (author), Limbert, Georges (author)

Bats fly using significantly different wing motions from other fliers, stemming from the complex interplay of their membrane wings’ motion and structural properties. Biological studies show that many bats fly at Strouhal numbers, the ratio of flapping to flight speed, 50–150% above the range typically associated with optimal locomotion. We use...

journal article 2023

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Sizing of Hybrid Power Systems for Off-Grid Applications Using Airborne Wind Energy

Reuchlin, S.P.A. (author), Joshi, R. (author), Schmehl, R. (author)

The majority of remote locations not connected to the main electricity grid rely on diesel generators to provide electrical power. High fuel transportation costs and significant carbon emissions have motivated the development and installation of hybrid power systems using renewable energy such these locations. Because wind and solar energy is...

journal article 2023

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Modelling Aero-Structural Deformation of Flexible Membrane Kites

Poland, J.A.W. (author), Schmehl, R. (author)

Airborne wind energy systems using flexible membrane wings have the advantages of a low weight, small packing volume, high mobility and rapid deployability. This paper investigates the aero-structural deformation of a leading edge inflatable kite for airborne wind energy harvesting. In the first step, a triangular two-plate representation of the...

journal article 2023

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Towards parallel time-stepping for the numerical simulation of atherosclerotic plaque growth

Frei, Stefan (author), Heinlein, A. (author)

The numerical simulation of atherosclerotic plaque growth is computationally prohibitive, since it involves a complex cardiovascular fluid-structure interaction (FSI) problem with a characteristic time scale of milliseconds to seconds, as well as a plaque growth process governed by reaction-diffusion equations, which takes place over several...

journal article 2023

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Free wake panel method simulations of a highly flexible wing in flutter and gusts

Pinto Ribeiro, A. (author), Casalino, D. (author), Ferreira, Carlos (author)

This paper presents low speed fluid structure interaction simulations of a highly flexible wing at various flow conditions, including flutter and excitation from sinusoidal gusts. Such wings are becoming more relevant in recent years, due to their potential for improving aerodynamics and reducing weight, while their flutter characteristics...

journal article 2023

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Fluid-structure interactions of peripheral arteries using a coupled in silico and in vitro approach

Schoenborn, S. (author), Lorenz, T. (author), Kuo, K. (author), Fletcher, D. F. (author), Woodruff, M. A. (author), Pirola, S. (author), Allenby, M. C. (author)

Vascular compliance is considered both a cause and a consequence of cardiovascular disease and a significant factor in the mid- and long-term patency of vascular grafts. However, the biomechanical effects of localised changes in compliance cannot be satisfactorily studied with the available medical imaging technologies or surgical simulation...

journal article 2023

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Two-phase free-surface flow interaction with moving bodies using a consistent, momentum preserving method

van der Eijk, M. (author), Wellens, P.R. (author)

The numerical prediction of two-phase flows with an interface is challenging, to a considerable extent because of the high density ratio at the interface. Numerical results become affected by momentum losses, diverging spurious interface velocities, free surface distortion, and even numerical instability. To prevent issues like these,...

journal article 2023

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A robust computational framework for simulating the dynamics of large assemblies of highly-flexible fibers immersed in viscous flow

Koshakji, Anwar (author), Chomette, Grégoire (author), Turner, Jeffrey (author), Jablonski, Jonathan (author), Haynes, Aisha (author), Carlucci, Donald (author), Giovanardi, Bianca (author), Radovitzky, Raúl A. (author)

The dynamic response of flexible filaments immersed in viscous fluids is important in cell mechanics, as well as other biological and industrial processes. In this paper, we propose a parallel computational framework to simulate the fluid-structure interactions in large assemblies of highly-flexible filaments immersed in a viscous fluid. We...

journal article 2023

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Theoretical analysis of nonlinear fluid–structure interaction between large-scale polymer offshore floating photovoltaics and waves

Xu, P. (author), Wellens, P.R. (author)

The present research analyzes the nonlinear fluid–structure interaction (FSI) of free surface waves with large-scale polymer offshore floating photovoltaics (LPOFPV). The floating structure is modeled as a nonlinear Euler Bernoulli–von Kármán (EBVK) beam coupling with water beneath. The EBVK theory takes the in-plane force into consideration to...

journal article 2022

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Fully nonlinear hydroelastic modeling and analytic solution of large-scale floating photovoltaics in waves

Xu, P. (author), Wellens, P.R. (author)

This paper concerns the fully nonlinear fluid–structure interaction (FSI) of Large-scale floating photovoltaics (LFPV) in waves. The Euler Bernoulli–von Kármán beam models the structure while potential flow represents the fluid. A set of coupled dynamical equations is established. The fully analytic solution is sought with the unified Stokes...

journal article 2022

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Response of a submerged floating tunnel subject to flow-induced vibration

Zou, P. (author), Bricker, J.D. (author), Chen, L. Z. (author), Uijttewaal, W.S.J. (author), Ferreira, Carlos (author)

In order to assess the dynamic performance of a submerged floating tunnel (SFT) subject to flow-induced vibration (FIV) conditions in a practical engineering application, a one-way fluid–structure interaction (FSI) model consisting of multi-scale hydrodynamic solvers combined with the finite element method (FEM) is established. A typical long...

journal article 2022

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On the combined flow and structural measurements via robotic volumetric PTV

Mitrotta, F.M.A. (author), Sodja, J. (author), Sciacchitano, A. (author)

This study describes a novel measurement approach for combined flow and structural measurements in wind tunnels using robotic volumetric particle tracking velocimetry (PTV). The measurement approach is based on the application of a particle tracking algorithm on images including flow or structure tracers, where the latter are implemented by...

journal article 2022

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A novel design method for wave-induced fatigue of flood gates

Kleiberg, T.N.J. (author), Tieleman, Orson (author), Versluis, Marco (author), Kortlever, Wim (author), ten Oever, Erik (author), Hofland, Bas (author)

This paper presents a novel design method to predict fatigue of flood gates due to dynamic wave loading. The accumulation of fatigue damage is predicted probabilistically over the entire lifetime of the structure rather than with a set of normative events. Load events are defined using a joint probability distribution of historical wind and...

journal article 2022

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A monolithic finite element formulation for the hydroelastic analysis of very large floating structures

Colomés, Oriol (author), Verdugo, Francesc (author), Akkerman, I. (author)

In this work we present a novel monolithic Finite Element method for the hydroelastic analysis of very large floating structures (VLFS) with arbitrary shapes that is stable, energy conserving, and overcomes the need of an iterative algorithm. The new formulation enables a fully monolithic solution of the linear free-surface flow, described by...

journal article 2022

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The impacts of internal solitary waves on a submerged floating tunnel

Zou, P. (author), Bricker, J.D. (author), Uijttewaal, W.S.J. (author)

The interaction between an oceanic internal solitary wave (ISW) and a prototype submerged floating tunnel (SFT) is numerically investigated. Effect of oceanic internal solitary wave amplitude, the relative distance of the SFT to the pycnocline, cross-sectional geometry of the SFT, and the density ratio of the two fluid layers are analyzed. At...

journal article 2021

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Adaptive reduced-order modeling for non-linear fluid–structure interaction

Thari, Ali (author), Pasquariello, Vito (author), Aage, Niels (author), Hickel, S. (author)

We present an adaptive reduced-order model for the efficient time-resolved simulation of fluid–structure interaction problems with complex and non-linear deformations. The model is based on repeated linearizations of the structural balance equations. Upon each linearization step, the number of unknowns is strongly decreased by using modal...

journal article 2021