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Cascioli, E. (author)The current need to ensure an effective and prompt transition of the energy sector towards zero-carbon has renewed the interest for nuclear technology. Small Modular Reactors (SMRs) seem particularly interesting for their reduced capital cost, operational flexibility and enhanced safety and security. Different SMR concepts are being developed...doctoral thesis 2024
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Savazzi, A.C.M. (author), Nuijens, Louise (author), De Rooy, Wim (author), Janssens, M. (author), Siebesma, A.P. (author)This study investigates momentum transport in shallow cumulus clouds as simulated with the Dutch Atmospheric Large Eddy Simulation (DALES) for a 150 3 150 km2 domain east of Barbados during 9 days of EUREC4A. DALES is initialized and forced with the mesoscale weather model HARMONIE-AROME and subjectively reproduces observed cloud patterns....journal article 2024
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Budi, Gunarjo Suryanto (author), Kenjeres, S. (author)This paper presents a study of developing a numerical turbulent model in a cavity heated from below using eddy viscosity combined with elliptic relaxation approach. The model uses a set of differential equations that consist of kinetic energy, its dissipation, variance of temperature, velocity scale and elliptic relaxation parameter, which are...journal article 2024
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Tambe, S.S. (author), Kato, Kentaro (author), Hussain, Zahir (author)This paper reports on the efficacy of the Görtler number in scaling the laminar-turbulent boundary-layer transition on rotating cones facing axial inflow. Depending on the half-cone angle and axial flow strength, the competing centrifugal and cross-flow instabilities dominate the transition. Traditionally, the flow is evaluated by using two...journal article 2024
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Haverkort, J.W. (author)Poor mass transport to or from vertical gas-evolving electrodes can adversely impact energy efficiency and product purity in the production of hydrogen, chlorine, and various metals. A proper description that combines natural convection with micromixing of growing, coalescing, and departing bubbles is presently lacking. This work develops a...journal article 2024
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Numerical analysis of a parallel triple-jet of liquid-sodium in a turbulent forced convection regimeCascioli, E. (author), Kaaks, B.J. (author), Keijers, S. (author), Van Tichelen, K. (author), Kenjeres, S. (author)In the present study, we have applied a combined wall-resolving dynamic Large-Eddy Simulation (LES) (for the velocity field) and Direct Numerical Simulation (DNS) (for the temperature field) approach for mixing of parallel triple-jets with different temperatures of liquid sodium in a turbulent forced convection regime. Because of the high...journal article 2024
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van den Berghe, Marjolein (author)Geothermal energy can be promising to help the energy transition. Warm water is pumped up from a geothermal well and after it is cooled down, the cold water is reinjected into the hot aquifer underground. The temperature change could cause chemical balances to be disturbed and result in precipitation on the porous medium of the aquifer. This...bachelor thesis 2023
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Chakraborty, Aneek (author)Thermal convection is a phenomenon seen in almost all facets of life, ranging from planetary convection to ocean currents and convection inside the Earth. The physics of thermal convection complicates when a porous wall layer is present. Flow over urban canopies, forest canopies or flow in underground aquifers are classic examples where thermal...master thesis 2023
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Jager, Pim (author)In dit verslag is een eolisch sedimenttransport model geformuleerd en het model van De Vries geïmplementeerd en geanalyseerd. Na de afleiding van de eendimensionale advectie-diffusievergelijking vanuit de driedimensionale continuïteitsvergelijking is eerst het model van De Vries zonder diffusie onderzocht. In het model kan er onderscheid gemaakt...bachelor thesis 2023
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Mak, Ho Yi Lydia (author)In the atmospheric boundary layer, when surface heat flux is small and mean wind shear is strong, horizontal convective rolls that are elongated along the wind shear are formed. This study attempts to explain the asymmetry of rolls in terms of turbulence using large-eddy simulations. A pressure gradient in the north-south y direction is applied,...student report 2023
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Oldenhuis, David (author)The Atlantic Meridonial Overturning Circulation (AMOC) in the North Atlantic Ocean (NAO) plays a major role in earth’s climate and climate change. A key element of the AMOC is deep convection, which is still not fully understood. One of the unknowns is where water is exchanged between the boundary current and the regions where deep convection...student report 2023
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QIU, Haodong (author)Hybrid structures consisting of FRP(fiber reinforce polymer) composite decks<br/>connected to a steel girder superstructure are gaining more attention by combining the stiffness of steel members with good fatigue endurance and high strength to weight ratio of FRP. However, when composite material FRP is exposed to elevated temperature,...master thesis 2023
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Wang, Y. (author), Zhang, Z. (author), Vuik, Cornelis (author), Hajibeygi, H. (author)An efficient compositional framework is developed for simulation of CO <sub>2</sub> storage in saline aquifers during a full-cycle injection, migration and post-migration processes. Essential trapping mechanisms, including structural, dissolution, and residual trapping, which operate at different time scales, are accurately captured in the...journal article 2023
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ten Bosch, B.I.M. (author)A variational principle for the Upper Convected Maxwell model is presented. The stationary value of the appropriate functional is the drag on an immersed object. From the principle, a formula is derived for the derivative of the drag with respect to the Deborah number for an arbitrarily shaped particle in a circular duct under creeping flow...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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Rajora, A. (author), Haverkort, J.W. (author)Understanding multiphase flow close to the electrode surface is crucial to the design of electrolyzers, such as alkaline water electrolyzers for the production of green hydrogen. Vertical electrodes develop a narrow gas plume near their surface. We apply the integral method to the mixture model. Considering both exponentially varying and step...journal article 2023
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DIMOU, KYPRIANOS (author)Nowadays, climate change and global warming phenomena are becoming more and more serious issues. In order to sustain the enormous worldwide energy demand, society consumes a high amount of fuel, resulting into the steep increase of the level of CO\textsubscript{2} in the environment. Therefore, the massive greenhouse gases emissions in the...master thesis 2022
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Kollaard, Freek (author)As the environment is changing temperatures are changing, becoming more extreme. This is expected to affect the oceans and its transport, specifically the Atlantic Meridional Overturning Circulation (AMOC). The Labrador Sea is a part of the AMOC, where overturning in depth and density space occurs, due to deep convection. Deep convection is the...master thesis 2022
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Quattrucci, Giacomo (author)The optimization of heat transfer in turbulent upward pipe flows is a very common problem in engineering, due to the wide range of applications. However, this set-up is usually categorised as mixed convection flow, which means that gravity plays an important role. Sometimes, it might lead to heat transfer deterioration. This research will...master thesis 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