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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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Başkaya, A.O. (author), Capriati, Michele (author), Turchi, Alessandro (author), Magin, Thierry (author), Hickel, S. (author)The efficacy of immersed boundary (IB) methods with adaptive mesh refinement (AMR) techniques is assessed in the context of atmospheric entry applications, including effects of chemical nonequilibrium (CNE) and gas–surface interactions (GSI). We scrutinize a conservative cut-cell IB method and two non-conservative IB methods, comparing their...journal article 2024
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Lam, Sam (author)Wall-modeled large eddy simulations (WMLES) are becoming an increasingly viable tool to study complex unsteady turbulent flows. Conventional wall models applied in these simulations are however not applicable to laminar boundary layers. While these encompass only a tiny fraction of the total surface area, erroneous predictions in this region of...master thesis 2023
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Başkaya, A.O. (author), Hickel, S. (author)A conservative cut-cell immersed boundary (IB) method including gas-surface interactions (GSI) for the simulation of atmospheric entry flows under thermochemical nonequilibrium (TCNE) conditions is presented. The performance<br/>of the method is demonstrated for three test cases: a compression ramp, a cylinder, and a plasma wind tunnel ablator...conference paper 2023
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van Elsloo, Sam (author)The Lattice Boltzmann Method (LBM) is an appealing framework to apply to unsteady, incompressible, low Reynolds number flow due to its simplicity and potential for massive parallelisation. The immersed boundary method is often used in conjunction with the LBM to simulate flow around curved, moving boundaries in the interior of the fluid domain....master thesis 2022
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Cakir, B.O. (author), Gonzalez Saiz, G. (author), Sciacchitano, A. (author), van Oudheusden, B.W. (author)Three-dimensional Lagrangian particle tracking measurements with helium filled soap bubbles provide quantitative flow visualizations in large measurement volumes up to the cubic metre scale. However, the instantaneously available fluid information density is severely restricted by the finite spatial resolution of the measurements. Therefore,...journal article 2022
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Bunk, Yannick (author)The development of a high-fidelity fluid-structure interaction tool for the simulation of aircraft flight dynamics in the subsonic flow regime is presented. The tool combines a high-fidelity large-eddy simulation code with an immersed boundary method, a multibody solver and a loose coupling scheme between fluid and solid. The development of the...master thesis 2022
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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
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Casquero, Hugo (author), Bona-Casas, Carles (author), Toshniwal, D. (author), Hughes, Thomas J.R. (author), Gomez, Hector (author), Zhang, Yongjie Jessica (author)We extend the recently introduced divergence-conforming immersed boundary (DCIB) method [1] to fluid-structure interaction (FSI) problems involving closed co-dimension one solids. We focus on capsules and vesicles, whose discretization is particularly challenging due to the higher-order derivatives that appear in their formulations. In two...journal article 2021
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Başkaya, Ata (author)Atmospheric entry is a crucial phase in planetary exploration missions. During entry, the vehicle experiences severe heating at hypersonic speeds. To ensure the survival of the payload, this heating needs to be mitigated using thermal protection systems. Ablative shielding materials dissipate the incoming heat largely by surface reactions...master thesis 2020
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Krishnan, Navaneetha (author), Viré, A.C. (author), Schmehl, R. (author), van Bussel, G.J.W. (author)A novel immersed boundary method based on a domain decomposition approach is proposed in the context of a finite element discretisation method. It is applicable to incompressible flows past rigid, deforming, or moving bodies. In this method, unlike most immersed boundary methods, strong boundary conditions are imposed in the regions of the...journal article 2020
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Shajahan, M.T. (author), Breugem, W.P. (author)Macroscopic properties of sedimenting suspensions have been studied extensively and can be characterized using the Galileo number (Ga), solid-to-fluid density ratio (π<sub>p</sub>) and mean solid volume concentration (ϕ¯). However, the particle–particle and particle–fluid interactions that dictate these macroscopic trends have been...journal article 2020
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Srinivasan, Sudharsan (author), van den Akker, H.E.A. (author), Shardt, Orest (author)Three-dimensional direct numerical simulations of dense suspensions of monodisperse spherical particles in simple shear flow have been performed at particle Reynolds numbers between 0.1 and 0.6. The particles translate and rotate under the influence of the applied shear. The lattice Boltzmann method was used to solve the flow of the...journal article 2020
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Brandt, C. (author), Scandolo, L. (author), Eisemann, E. (author), Hildebrandt, K.A. (author)We introduce the Reduced Immersed Method (RIM) for the real-time simulation of two-way coupled incompressible fluids and elastic solids and the interaction of multiple deformables with (self-)collisions. Our framework is based on a novel discretization of the immersed boundary equations of motion, which model fluid and deformables as a single...journal article 2019
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Maitri, R.V. (author), Das, S. (author), Kuipers, J.A.M. (author), Padding, J.T. (author), Peters, E.A.J.F. (author)In this paper, an accurate and stable sharp interface immersed boundary method(IBM) is presented for the direct numerical simulation of particle laden flows. The current IBM method is based on the direct-forcing method by incorporating the ghost-cell approach implicitly. An important feature of this IBM is the sharp representation of the solid...journal article 2018
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Hageman, Tim (author)Heat transfer is important in many applications. For instance, due to the decrease in size of electronics, it<br/>becomes more necessary to have efficient and smaller cooling systems. In order to increase the effect of the<br/>cooling liquids used, it might be interesting to add extra solid particles with a high conductivity, to possibly<br/...master thesis 2017
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- Patel, H.V. (author), Das, S. (author), Kuipers, J.A.M. (author), Padding, J.T. (author), Peters, E.A.J.F. (author) journal article 2017
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Jin, W. (author), Kleijn, C.R. (author), van Ommen, J.R. (author)For simulating rarefied gas flows around a moving body, an immersed boundary method is presented here in conjunction with the Direct Simulation Monte Carlo (DSMC) method in order to allow the movement of a three dimensional immersed body on top of a fixed background grid. The simulated DSMC particles are reflected exactly at the landing...conference paper 2016
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Suzuki, T. (author)It has been widely recognized that ongoing climate change, most likely due to human interference with nature, may accelerate sea level rise and increase storm intensity. It is therefore urgent to design countermeasures to alleviate the impact of climate change on coastal regions. Apart from the view point of coastal protection, it is also very...doctoral thesis 2011
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Suzuki, T. (author), Arikawa, T. (author)In this paper, bulk drag coefficient in rigid dense vegetation is investigated mainly by using a three dimensional numerical simulation model CADMAS-SURF/3D by incorporating Immersed Boundary Method to calculate flow around the vertical cylinder in the Cartesian grid. Large Eddy Simulation is also incorporated as a turbulence model. Firstly,...conference paper 2010
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