Cross-variable amplitude-frequency coupling during intermittency in a turbulent thermoacoustic systemWe investigate flame-acoustic interactions in a turbulent combustor during the state of intermittency before the onset of thermoacoustic instability using complex networks. Experiments are performed…Shruti Tandon, Aswin Balaji, Rohit Radhakrishnan et al.·Jul 29, 2024SaveLearn
The flow field due to a sphere moving in a viscous, density stratified fluidWe study the flow field induced by a sphere translating in a viscous density-stratified ambient, specifically, in the limit of small Reynolds (Re = U a/μ 1), and viscous Richardson…Ramana Patibandla, Anubhab Roy, Ganesh Subramanian·Jul 28, 2024SaveLearn
WindsorML: High-Fidelity Computational Fluid Dynamics Dataset For Automotive AerodynamicsThis paper presents a new open-source high-fidelity dataset for Machine Learning (ML) containing 355 geometric variants of the Windsor body, to help the development and testing of ML surrogate models…Neil Ashton, Jordan B. Angel, Aditya S. Ghate et al.·Jul 27, 2024SaveLearn
A Second-Order, Variable-Resolution, Weakly-Compressible Smoothed Particle Hydrodynamics SchemeThe smoothed particle hydrodynamics (SPH) method has been widely used to simulate incompressible and slightly compressible fluid flows. Adaptive refinement strategies to dynamically increase the…Abhinav Muta, Pawan Negi, Prabhu Ramachandran·Jul 26, 2024SaveLearn
A New Higher-Order Super Compact Finite Difference Scheme to Study Three-Dimensional Non-Newtonian FlowsThis work introduces a new higher-order accurate super compact (HOSC) finite difference scheme for solving complex unsteady three-dimensional (3D) non-Newtonian fluid flow problems. As per the…Ashwani Punia, Rajendra K. Ray·Jul 26, 2024SaveLearn
Reinforcement learning for anisotropic p-adaptation and error estimation in high-order solversWe present a novel approach to automate and optimize anisotropic p-adaptation in high-order h/p solvers using Reinforcement Learning (RL). The dynamic RL adaptation uses the evolving solution to…David Huergo, Martín de Frutos, Eduardo Jané et al.·Jul 26, 2024SaveLearn
Direct numerical simulation of drag reduction in rotating pipe flow up to Reτ ≈ 3000Direct numerical simulations (DNS) of rotating pipe flows up to Reτ ≈ 3000 are carried out to investigate drag reduction effects associated with axial rotation, extending previous…Maochao Xiao, Alessandro Ceci, Paolo Orlandi et al.·Jul 26, 2024SaveLearn
Toward ultra-efficient high-fidelity prediction of bed morphodynamics of large-scale meandering rivers using a novel LES-trained machine learning approachFlood-induced deformation of the bed topography of fluvial meandering rivers could lead to river bank displacement, structural failure of the infrastructures, and the propagation of scour or…Zexia Zhang, Mehrshad Gholami Anjiraki, Hossein Seyedzadeh et al.·Jul 25, 2024SaveLearn
Computation and stability analysis of periodic orbits using finite differences, Fourier or Chebyshev spectral expansions in timeWe analyse and compare several algorithms to compute numerically periodic solutions of high-dimensional dynamical systems and investigate their Floquet stability without building the monodromy…Artur Gesla, Yohann Duguet, Patrick Le Quéré et al.·Jul 25, 2024SaveLearn
Lagrangian flow networks for passive dispersal: tracers versus finite size particlesThe transport and distribution of organisms like larvae, seeds or litter in the ocean as well as particles in industrial flows is often approximated by a transport of tracer particles. We present a…Deoclécio Valente, Ksenia Guseva, Ulrike Feudel·Jul 25, 2024SaveLearn
Incremental Singular Value Decomposition Based Model Order Reduction of Scale Resolving Fluid Dynamic SimulationsScale-resolving flow simulations often feature several million [thousand] spatial [temporal] discrete degrees of freedom. When storing or re-using these data, e.g., to subsequently train some sort of…Niklas Kühl·Jul 25, 2024SaveLearn
Experimental and Numerical Study of Microcavity Filling Regimes for Lab-on-a-Chip ApplicationsThe efficient and voidless filling of microcavities is of great importance for Lab-on-a-Chip applications. However, predicting whether microcavities will be filled or not under different…Luise Nagel, Anja Lippert, Ronny Leonhardt et al.·Jul 25, 2024SaveLearn
Travel time and energy dissipation minima in heterogeneous subsurface flowsWe establish a number of results concerning conditions for minimum energy dissipation and advective travel time in porous and fractured media. First, we establish a pair of converse results…Scott K. Hansen, Daniel O'Malley·Jul 25, 2024SaveLearn
Resonant excitation of Kelvin waves by interactions of subtropical Rossby waves and the zonal mean flowEquatorial Kelvin waves can be affected by subtropical Rossby wave dynamics. Previous research has demonstrated the Kelvin wave growth in response to subtropical forcing and the resonant growth due…Katharina M. Holube, Frank Lunkeit, Sergiy Vasylkevych et al.·Jul 25, 2024SaveLearn
Computational Investigation on the formation of liquid-fueled oblique detonation wavesUtilizing a two-phase supersonic chemically reacting flow solver with the Eulerian-Lagrangian method implemented in OpenFOAM, this study computationally investigates the formation of liquid-fueled…Wenhao Wang, Zongmin Hu, Peng Zhang·Jul 25, 2024SaveLearn
Responses to Disturbance of Supersonic Shear Layer: Input-Output AnalysisWe investigate the perturbation dynamics in a supersonic shear layer using a combination of large-eddy simulations (LES) and linear-operator-based input-output analysis. The flow consists of two…Mitesh Thakor, Yiyang Sun, Datta V. Gaitonde·Jul 24, 2024SaveLearn
What makes a steady flow to favour kinematic magnetic field generation: A statistical analysisTo advance our understanding of the magnetohydrodynamic (MHD) processes in liquid metals, in this paper we propose an approach combining the classical methods in the dynamo theory based on numerical…Francisco Stefano de Almeida, Roman Chertovskih, Sílvio Gama et al.·Jul 24, 2024SaveLearn
Mixed Convection and Entropy Generation Analysis of Carbon Nanotube-Water Nanofluid in a Square Cavity with Cylinders and Flow DeflectorsThis study explores the mixed convection of carbon nanotube (CNT)-water nanofluid within a square cavity containing heated cylinders under the influence of a magnetic field, focusing on three…Hashnayne Ahmed, Shashanka Biswas, Farzana Akter Tina·Jul 24, 2024SaveLearn
Upscaling transport in heterogeneous media featuring local-scale dispersion: flow channeling, macro-retardation and parameter predictionMany theoretical treatments of transport in heterogeneous Darcy flows consider advection only. When local-scale dispersion is neglected, flux-weighting persists over time; mean Lagrangian and…Lian Zhou, Scott K. Hansen·Jul 24, 2024SaveLearn
Extensions to the Navier-Stokes-Fourier Equations for Rarefied Transport: Variational Multiscale Moment Methods for the Boltzmann EquationWe derive a fourth order entropy stable extension of the Navier-Stokes-Fourier equations into the transition regime of rarefied gases. We do this through a novel reformulation of the closure of…F. A. Baidoo, I. M. Gamba, T. J. R. Hughes et al.·Jul 24, 2024SaveLearn
Wind-farm wake recovery mechanisms in conventionally neutral boundary layersSynthetic-aperture radar images and mesoscale model results show that wind-farm wakes behave very differently than single-turbine wakes, e.g. with wakes that seemingly narrow and do not disperse over…Luca Lanzilao, Johan Meyers·Jul 24, 2024SaveLearn
Vertical impact of a water jet on a hot plate from a growing drop to spray formationIn this article, we experimentally investigate the impact of a submillimetric water jet on a horizontal surface heated well above the "static" Leidenfrost temperature of water. We observe the…Aurélien Goerlinger, Alice Germa, Farzam Zoueshtiagh et al.·Jul 24, 2024SaveLearn
Interaction of water surface waves with periodic and quasiperiodic cylinder arraysInspired by transformation optics and photonic crystals, this paper presents a computational investigation into the interaction between water surface waves and array waveguides of cylinders with…Joseph A. Smerdon, Sam Coates, Bogdan J. Matuszewski et al.·Jul 24, 2024SaveLearn
Nonlinear dynamics of vortex pairing in transitional jetsThis study investigates the onset of linear instabilities and their later nonlinear interactions in the shear layer of an initially-laminar jet using a combination of stability analysis and data from…Akhil Nekkanti, Tim Colonius, Oliver T. Schmidt·Jul 23, 2024SaveLearn
Surfing vortex rings for energy-efficient propulsionLeveraging background fluid flows for propulsion has the potential to enhance the range and speed of autonomous aerial and underwater vehicles. In this work, we demonstrate experimentally a fully…Peter Gunnarson, John O. Dabiri·Jul 23, 2024SaveLearn