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Pasolari, R. (author), Ferreira, Carlos (author), van Zuijlen, A.H. (author), Baptista, C.F. (author)The past few decades have witnessed a growing popularity in Eulerian–Lagrangian solvers due to their significant potential for simulating aerodynamic flows, particularly in cases involving strong body–vortex interactions. In this hybrid approach, the two component solvers are mutually coupled in a two-way fashion. Initially, the Lagrangian...journal article 2024
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Pan, J. (author), Ferreira, Carlos (author), van Zuijlen, A.H. (author)To investigate the effect of force distributions of each turbine component on the power performance of the Darrieus–Savonius combined vertical axis wind turbine (hybrid VAWT), the hybrid VAWT is modeled as idealized turbine under various force distributions. The goal of idealization is to simplify the intricate interactions between the...journal article 2024
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Zwijsen, K. (author), van den Bos, N. (author), Frederix, E. M.A. (author), Roelofs, F. (author), van Zuijlen, A.H. (author)The vibration of fuel rods induced by the fast flowing coolant is a known challenge to nuclear power plant designers and operators. If not dealt with adequately, the vibrations could lead to undesirable wear and tear of the cladding, which, in turn, could result in fuel rod failures and costly unplanned outages of the power plant. Hence,...journal article 2024
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Pasolari, R. (author), Ferreira, Carlos (author), van Zuijlen, A.H. (author)In the field of computational aerodynamics, it is vital to develop tools that can accurately, but also efficiently, simulate the flow around bluff objects and calculate the aerodynamic forces acting on them. When strong body–vortex interactions take place, the simulations become more demanding, since complex phenomena appear. To address this...journal article 2023
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Pan, J. (author), Ferreira, Carlos (author), van Zuijlen, A.H. (author)To investigate power losses of a Darrieus-Savonius combined vertical axis wind turbine (hybrid VAWT) associated with the interaction between blades and wake, it is crucial to understand the flow phenomena around the turbine. This study presents a two-dimensional numerical analysis of vortex dynamics for a hybrid VAWT. The integration of a...journal article 2023
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Egberts, G. (author), Vermolen, F.J. (author), van Zuijlen, Paul (author)Severe burn injuries often lead to skin contraction, leading to stresses in and around the damaged skin region. If this contraction leads to impaired joint mobility, one speaks of contracture. To optimize treatment, a mathematical model, that is based on finite element methods, is developed. Since the finite element-based simulation of skin...journal article 2023
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Egberts, G. (author), Vermolen, F.J. (author), van Zuijlen, Paul (author)We consider the stability analysis of a two-dimensional model for post-burn contraction. The model is based on morphoelasticity for permanent deformations and combined with a chemical-biological model that incorporates cellular densities, collagen density, and the concentration of chemoattractants. We formulate stability conditions depending...journal article 2023
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van den Bos, N. (author), Zwijsen, Kevin (author), van Zuijlen, A.H. (author), Frederix, Edo M.A. (author), Roelofs, Ferry (author)In nuclear fuel rod bundles, turbulence-induced pressure fluctuations caused by an axial flow can create small but significant vibrations in the fuel rods, which in turn can cause structural effects such as material fatigue and fretting wear. Fluid-structure interaction simulations can be used to model these vibrations, but for affordable...journal article 2023
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van Assen, J.J.R. (author), van Zuijlen, M.J.P. (author), Nishida, Shin'ya (author)Visual motion computation is challenging under real-world conditions due to continuous contextual changes such as varying lighting conditions and a large range of optical material properties. Due to these changes the retinal optical flow can drastically vary while the physical motion of an object remains constant. Especially materials with high...abstract 2022
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van Zuijlen, Paul P.M. (author), Korkmaz, Halil Ibrahim (author), Sheraton, Vivek M. (author), Haanstra, Tsjitske M. (author), Pijpe, Anouk (author), de Vries, Annebeth (author), van der Vlies, Cornelis H. (author), Bosma, Eelke (author), de Jong, Evelien (author), Middelkoop, Esther (author), Vermolen, F.J. (author), Sloot, Peter M.A. (author)Health care is undergoing a profound technological and digital transformation and has become increasingly complex. It is important for burns professionals and researchers to adapt to these developments which may require new ways of thinking and subsequent new strategies. As Einstein has put it: "We must learn to see the world anew." The...journal article 2022
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Pan, J. (author), Ferreira, Carlos (author), van Zuijlen, A.H. (author)This study investigates the implementation of the vortex particle method (VPM) with the goal of efficiently and accurately estimating the power performances and flow characteristics for a Savonius rotor. The accuracy and efficiency of simulation methods are critical for the reliable design of Savonius rotors. Among various approaches, VPM is...journal article 2022
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Egberts, G. (author), Desmoulière, Alexis (author), Vermolen, F.J. (author), van Zuijlen, Paul (author)We consider a two-dimensional biomorphoelastic model describing post-burn scar contraction. This model describes skin displacement and the development of the effective Eulerian strain in the tissue. Besides these mechanical components, signaling molecules, fibroblasts, myofibroblasts, and collagen also play a significant role in the model. We...journal article 2022
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van Zuijlen, M.J.P. (author)The world around us is filled with materials. Our ability of visual material perception informs us how to navigate and interact with our environment. It tells us, for example, whether food is fresh, if a chair is strong enough to sit on, how much force to use to pick up a glass, etc. Painters have studied how to depict the world and the...doctoral thesis 2021
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Risseeuw, Derek (author), van Oudheusden, B.W. (author), van Zuijlen, A.H. (author), Chourdakis, G. (author)Flapping wings display complex flows which can be used to generate large lift forces. Flexibility in wings is widely used by natural flyers to increase the aerodynamic performance. The influence of wing flexibility on the flow can be computed using numerical analysis with Fluid Structure Interaction (FSI). The influence of inertial, elastic and...conference paper 2021
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Lin, Hubert (author), van Zuijlen, M.J.P. (author), Pont, S.C. (author), Wijntjes, M.W.A. (author), Bala, Kavita (author)A common strategy for improving model robustness is through data augmentations. Data augmentations encourage models to learn desired invariances, such as invariance to horizontal flipping or small changes in color. Recent work has shown that arbitrary style transfer can be used as a form of data augmentation to encourage invariance to textures...conference paper 2021
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Egberts, G. (author), Vermolen, F.J. (author), van Zuijlen, Paul (author)We consider a one-dimensional morphoelastic model describing post-burn scar contraction. Contraction can lead to a limited range of motion (contracture). Reported prevalence of burn scar contractures are 58.6% at 3–6 weeks and 20.9% at 12 months post-reconstructive surgery after burns. This model describes the displacement of the dermal layer...journal article 2021
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Egberts, G. (author), Vermolen, F.J. (author), van Zuijlen, Paul (author)To deal with permanent deformations and residual stresses, we consider a morphoelastic model for the scar formation as the result of wound healing after a skin trauma. Next to the mechanical components such as strain and displacements, the model accounts for biological constituents such as the concentration of signaling molecules, the...journal article 2021
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van Zuijlen, M.J.P. (author), Lin, Hubert (author), Bala, Kavita (author), Pont, S.C. (author), Wijntjes, M.W.A. (author)In this paper, we capture and explore the painterly depictions of materials to enable the study of depiction and perception of materials through the artists’ eye. We annotated a dataset of 19k paintings with 200k+ bounding boxes from which polygon segments were automatically extracted. Each bounding box was assigned a coarse material label (e...journal article 2021
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Di Cicco, F. (author), van Zuijlen, M.J.P. (author), Wijntjes, M.W.A. (author), Pont, S.C. (author)Dutch 17th century painters were masters in depicting materials and their properties in a convincing way. Here, we studied the perception of the material signatures and key image features of different depicted fabrics, like satin and velvet. We also tested whether the perception of fabrics depicted in paintings related to local or global cues,...journal article 2021
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van Zuijlen, M.J.P. (author), Pont, S.C. (author), Wijntjes, M.W.A. (author)Painters are masters of depiction and have learned to evoke a clear perception of materials and material attributes in a natural, three-dimensional setting, with complex lighting conditions. Furthermore, painters are not constrained by reality, meaning that they could paint materials without exactly following the laws of nature, while still...journal article 2020
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