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Shajahan, M.T. (author)Dense suspension flows, both in the natural environment and industrial settings, are complex phenomena with significant implications. From rivers shaping landscapes to industrial processes involving slurry transport, these flows hold a prominent position in numerous sectors. This thesis delves into a specific facet of these intricate flows:...doctoral thesis 2024
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de Vries, Sietse (author), Schuller, Tomás (author), Galindo-Rosales, Francisco J. (author), Fanzio, P. (author)Fused Filament Fabrication is an additive manufacturing technique in which molten thermoplastic polymers are extruded through a nozzle. Therefore, the interplay between the viscoelastic nature of the polymer melt, temperature, printing conditions and nozzle shape may lead to inconsistent extrusion. To improve the extrusion control and...journal article 2024
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Magherini, A. (author), Yan Toe, C. (author), Stancanelli, L.M. (author), Wüthrich, D. (author), Uijttewaal, W.S.J. (author)Plastic pollution is a threat for all ecosystems due to its effects on people, animals, and environment (Mai et al., 2020). Rivers are estimated to transport around 0.5 millions tons of plastic per year (Strokal et al., 2023). When plastic enters a river system, it is transported downstream towards the sea but it is also likely to accumulate at...abstract 2024
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Aly, H.A. (author), Nealon, Rebecca (author), Gonzalez, Jean-François (author)We identify a new dust instability that occurs in warped discs. The instability is caused by the oscillatory gas motions induced by the warp in the bending wave regime. We first demonstrate the instability using a local 1D (vertical) toy model based on the warped shearing box coordinates and investigate the effects of the warp magnitude and...journal article 2024
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Akrish, G. (author), Reniers, A.J.H.M. (author), Zijlema, Marcel (author), Smit, P.B. (author)Coastal wave forecasting over large spatial scales is essential for many applications (e.g., coastal safety assessments, coastal management and developments, etc.). This demand explains the necessity for accurate yet effective models. A well-known efficient modelling approach is the quadratic approach (often referred to as frequency-domain...journal article 2024
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ten Wolde, M.A. (author), Farhadi Machekposhti, D. (author)Bistable mechanisms are prevalent across a broad spectrum of applications due to their ability to maintain two distinct stable states. Their energy consumption is predominantly confined to the process of state transitions, thereby enhancing their efficiency. However, the transition often requires two distinct digital inputs, implicating the...journal article 2024
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Bugeat, B. (author), Boldini, P.C. (author), Hasan, A.M. (author), Pecnik, Rene (author)This paper addresses the stability of plane Couette flow in the presence of strong density and viscosity stratifications. It demonstrates the existence of a generalised inflection point that satisfies the generalised Fjørtoft criterion of instability when a minimum of kinematic viscosity is present in the base flow. The characteristic scales...journal article 2024
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Zoppini, G. (author)The research presented in this thesis focuses on the receptivity to surface roughness of swept wing boundary layers dominated by crossflow instabilities (CFI), providing insights into how surface roughness can be used to passively control the developing instabilities. Discrete roughness elements (DRE) arrays and distributed randomized roughness...doctoral thesis 2023
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Kamis, Y.E. (author), Prakash, Suriya (author), Breugem, W.P. (author), Eral, H.B. (author)We experimentally and numerically study the dynamics of a liquid jet issued from a rotating orifice, whose breakup is regulated by a vibrating piezo element. The helical trajectory of the spiralling jet yields fictitious forces varying along the jet whose longitudinal projections stretch and thin the jet, affecting the growth of perturbations....journal article 2023
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Janssens, M. (author), Vilà-Guerau De Arellano, Jordi (author), Van Heerwaarden, Chiel C. (author), de Roode, S.R. (author), Siebesma, A.P. (author), Glassmeier, F. (author)Condensation in cumulus clouds plays a key role in structuring the mean, nonprecipitating trade wind boundary layer. Here, we summarize how this role also explains the spontaneous growth of mesoscale [.O(10) km] fluctuations in clouds and moisture around the mean state in a minimal-physics, large-eddy simulation of the undisturbed period...journal article 2023
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Tang, Tianning (author), Moss, Charlotte (author), Draycott, Samuel (author), Bingham, Harry B. (author), van den Bremer, T.S. (author), Li, Yan (author), Adcock, Thomas A.A. (author)An increased number of rogue waves, relative to standard distributions, can be induced by unidirectional waves passing over abrupt decreases in water depth. We investigate this phenomenon in a more general setting of multidirectional waves. We examine the influence of the directionality on the occurrence probability of rogue waves using...journal article 2023
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Pol, J.C. (author), Kindermann, P.E. (author), van der Krogt, M.G. (author), van Bergeijk, Vera M. (author), Remmerswaal, G. (author), Kanning, W. (author), Jonkman, Sebastiaan N. (author), Kok, M. (author)Structural reliability analysis often considers failure mechanisms as correlated but non-interacting processes. Interacting failure mechanisms affect each others performance, and thereby the system reliability. We describe such interactions in the context of flood defenses, and analyze under which conditions such interactions have a large impact...journal article 2023
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Kool, J.J. (author)In the last century, approximately 100,000 people lost their lives during a flood event and over 1.4 billion people were affected. As the population and economic activities grow in flood-prone areas and the frequencies and intensities of flood events increase due to climate change, damage due to flooding is expected to increase. To limit and...doctoral thesis 2022
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Dash, A. (author)Suspensions are of interest for curiosity-driven as well as applied research. From a fundamental perspective, inertia of the particles or the system triggers different behaviour in suspension flows. From an experimental perspective, analyzing suspensions is challenging due to their inherent opacity. This dissertation details the author's...doctoral thesis 2022
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Rius Vidales, A.F. (author)The market growth expected for commercial aviation in the coming decades and the increasing social awareness regarding the effects of global warming are driving significant technological developments necessary for emission reduction in future transport aircraft. From the aerodynamics perspective, a significant increase in aircraft efficiency can...doctoral thesis 2022
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van Thiel, T.C. (author)Modern materials synthesis techniques allowfor the layer-by-layer assimilation of structurally similar, yet compositionally different materials into artificial crystals, with atomic scale precision. At the resulting heterointerfaces, structural, electronic and magnetic reconstructions can lead to physical phenomena that are otherwise absent in...doctoral thesis 2022
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Tambe, S.S. (author)Boundary-layer instability induces spiral vortices on rotating cones. As they grow along the cone, the vortices enhance mixing of high- and low-momentum fluid, and subsequently, cause the boundary-layer to transition into a turbulent state. This transition process is scientifically enticing as it is one of the classical problems in fluid...doctoral thesis 2022
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Talebi, S. (author), Hedayati, R. (author), Sadighi, M. (author), Ashoori, A. R. (author)The aim of present work is to address nonlinear dynamic thermal buckling of shallow spherical functionally graded porous shells subjected to transient thermal loading using the first order shear deformation theory (FSDT). A power-law distribution as well as cosine-type porosity distribution are used to model the variation of constituents...journal article 2022
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Mohanan, Vaisakh Vilavinalthundil (author), Mak, H.Y.L. (author), Gurung, Nishan (author), Xu, Qin (author)Soft polymeric gels are susceptible to buckling-induced instabilities due to their great compliance to surface deformations. The instability patterns at soft interfaces have great potential in engineering functional materials with unique surface properties. In this work, we systematically investigated how swelling-induced instability patterns...journal article 2022
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Vesper, J.E. (author), Tietjen, Sebastian C. (author), Chakkingal, M. (author), Kenjeres, S. (author)In the present study, we analyse individual and combined effects of conductive horizontal walls and conductive fins on the natural convection of air in side heated cavities (SHC). The flow and heat transfer are studied for Rayleigh numbers in the range of 10<sup>4</sup>−−10<sup>9</sup>: Direct Numerical Simulation (DNS) is conducted for the...journal article 2022