Efficient Transonic Aeroelastic Model Reduction Using Optimized Sparse Multi-Input Polynomial FunctionalsNonlinear aeroelastic reduced-order models (ROMs) based on machine learning or artificial intelligence algorithms can be complex and computationally demanding to train, meaning that for practical…Michael Candon, Maciej Balajewicz, Arturo Delgado-Gutierrez et al.·Aug 29, 2024SaveLearn
Experimental validation of a linear momentum and bluff-body model for high-blockage cross-flow turbine arraysIn a confined flow, the performance of a turbine and its near-wake fluid dynamics depend on the blockage ratio, defined as the ratio of the turbine projected area to the channel cross-sectional area.…Aidan Hunt, Ari Athair, Owen Williams et al.·Aug 29, 2024SaveLearn
Physics-Informed Neural Networks for Weakly Compressible Flows Using Galerkin-Boltzmann FormulationIn this work, we study the Galerkin-Boltzmann formulation within a physics-informed neural network (PINN) framework to solve flow problems in weakly compressible regimes. The Galerkin-Boltzmann…Atakan Aygun, Ali Karakus·Aug 29, 2024SaveLearn
Physical Similarity of Fluid Flow in Bimodal Porous Media: Part 1 -- Basic Model and Solution CharacteristicsFluid flow through bimodal porous media, characterized by a distinct separation in pore size distribution, is critical in various scientific and engineering applications, including groundwater…Yuhe Wang, Yating Wang·Aug 29, 2024SaveLearn
Unsteady Load Mitigation through Passive PitchMitigation of load fluctuations due to flow unsteadiness is critical in a broad range of applications, including wind/tidal turbines, and aerial/underwater vehicles. While the use of active control…Yabin Liu, Riccardo Broglia, Anna M. Young et al.·Aug 29, 2024SaveLearn
Controlling Tip Vortices and Cavitation through Tip Permeability for Tidal TurbinesBlade-tip vortices can lead to wakes, cavitation and noise, and their control remains a significant challenge for tidal and wind turbines. In the present work, we propose and investigate controlling…Yabin Liu, Junchen Tan, Richard H. J. Willden et al.·Aug 29, 2024SaveLearn
How does vortex dynamics help undulating bodies spread odor?In this paper, we examine the coupling between odor dynamics and vortex dynamics around undulating bodies, with a focus on bio-inspired propulsion mechanisms. Utilizing computational fluid dynamics…Maham Kamran, Amirhossein Fardi, Chengyu Li et al.·Aug 28, 2024SaveLearn
The interpretation of the amplitude modulation coefficient and a transport-based alternativeThe amplitude modulation coefficient, R, that is widely used to characterize non-linear interactions between large- and small-scale motions in wall-bounded turbulence is not actually compatible…Guangyao Cui, Ian Jacobi·Aug 28, 2024SaveLearn
Evaporation of water-in-oil microemulsion dropletEmulsion fuels have the potential to reduce both particulate matter and NOx emissions and can potentially improve the efficiency of combustion engines. However, their limited stability remains a…Bal Krishan, Preetika Rastogi, D. Chaitanya Kumar Rao et al.·Aug 28, 2024SaveLearn
Spectrum correction in Ekman-Navier-Stokes turbulenceThe presence of a linear friction drag affects significantly the dynamics of turbulent flows in two-dimensions. At small scales, it induces a correction to the slope of the energy spectrum in the…V. J. Valadão, G. Boffetta, F. De Lillo et al.·Aug 28, 2024SaveLearn
Phase-field-based lattice Boltzmann method for the transport of insoluble surfactant in two-phase flowsIn this work, we present a general second-order phase-field model for the transport of insoluble surfactant in incompressible two-phase flows. In this model, the second-order local Allen-Cahn…Chengjie Zhan, Hong Liang, Zhenhua Chai et al.·Aug 28, 2024SaveLearn
Weakly nonlinear analysis of the onset of convection in rotating spherical shellsA weakly nonlinear study is numerically conducted to determine the behaviour near the onset of convection in rotating spherical shells. The mathematical and numerical procedure is described in…Calum S. Skene, Steven M. Tobias·Aug 28, 2024SaveLearn
Opposition control applied to turbulent wingsWe conducted high-resolution large-eddy simulations (LESs) to explore the effects of opposition control (OC) on turbulent boundary layers (TBLs) over a wing at a chord-based Reynolds number…Yuning Wang, Marco Atzori, Ricardo Vinuesa·Aug 28, 2024SaveLearn
Wing twist and folding work in synergy to propel flapping wing animals and robotsWe designed and built a three degrees-of-freedom (DOF) flapping wing robot, Flapperoo, to study the aerodynamic benefits of wing folding and twisting. Forces and moments of this physical model are…Xiaozhou Fan, Alexander Gehrke, Kenneth Breuer·Aug 28, 2024SaveLearn
ML-ROM Wall Shear Stress Prediction in Patient-Specific Vascular Pathologies under a Limited Clinical Training Data RegimeHigh-fidelity numerical simulations such as Computational Fluid Dynamics (CFD) have been proven effective in analysing haemodynamics, offering insight into many vascular conditions. However, these…Chotirawee Chatpattanasiri, Federica Ninno, Catriona Stokes et al.·Aug 27, 2024SaveLearn
Energy spectrum of two-dimensional isotropic rapidly rotating turbulenceWe study a two-dimensional isotropic rotating system and obtain both theoretically and numerically a K-2 energy spectrum under the rapidly rotating condition (Ro 1), which was initially…Peiyang Li, Jin-Han Xie·Aug 27, 2024SaveLearn
On the settling and clustering behavior of polydisperse gas-solid flows with application to pyroclastic density currentsSedimenting flows occur in a range of society-critical systems, such as circulating fluidized bed reactors and pyroclastic density currents (PDCs), the most hazardous volcanic process. In these…E. Foster, E. C. P. Breard, S. Beetham·Aug 27, 2024SaveLearn
Enhancement of the sound absorption of closed-cell mineral foams by perforations: Manufacturing process and model-supported adaptationThin low-frequency acoustic absorbers that are economical to produce in large quantities are scarce, and their efficiency is often limited to a narrow frequency range. In this paper, we present…Bart Van Damme, Théo Cavalieri, Cong-Truc Nguyen et al.·Aug 27, 2024SaveLearn
Influence of Cavity Geometry on the Bubble Dynamics of Nucleate Pool BoilingNucleate pool boiling is known for its exceptional heat transfer coefficients, with the use of cavities further improving bubble nucleation and heat transfer rate. To promote this heat transfer…M. S. Whiting, W. J. van den Bergh, P. E. Theodorakis et al.·Aug 27, 2024SaveLearn
Probabilistic data-driven turbulence closure modeling by assimilating statisticsA framework for deriving probabilistic data-driven closure models is proposed for coarse-grained numerical simulations of turbulence in statistically stationary state. The approach unites the ideal…Sagy Ephrati·Aug 27, 2024SaveLearn
Shock Wave Interaction with a Naturally Generated Vortex RingThe vortex ring is usually analytically modelled in computational studies involving vortex ring and shock wave interaction. However, incompressibility assumptions of the isolated vortex ring model…Swapnil Ashok Ahire, Avijit Chatterjee·Aug 27, 2024SaveLearn
Model-Based Reinforcement Learning for Control of Strongly-Disturbed Unsteady Aerodynamic FlowsThe intrinsic high dimension of fluid dynamics is an inherent challenge to control of aerodynamic flows, and this is further complicated by a flow's nonlinear response to strong disturbances. Deep…Zhecheng Liu, Diederik Beckers, Jeff D. Eldredge·Aug 26, 2024SaveLearn
Internal gravity waves in flow past a bluff body under different levels of stratificationThe flow field of a bluff body, a circular disk, that moves horizontally in a stratified environment is studied using large eddy simulations (LES). Five levels of stratification (body Froude numbers…Divyanshu Gola, Sheel Nidhan, Sutanu Sarkar·Aug 26, 2024SaveLearn
Improving propulsive efficiency using bio-inspired intermittent locomotionMany swimmers, especially small to medium-sized animals, use intermittent locomotion that differs from continuous swimming of large species. This type of locomotion, called burst-and-coast, is often…Tristan Aurégan, Mathilde Lemoine, Benjamin Thiria et al.·Aug 26, 2024SaveLearn
Spectrally Informed Learning of Fluid FlowsAccurate and efficient fluid flow models are essential for applications relating to many physical phenomena including geophysical, aerodynamic, and biological systems. While these flows may exhibit…Benjamin D. Shaffer, Jeremy R. Vorenberg, M. Ani Hsieh·Aug 26, 2024SaveLearn