A high-fidelity finite volume scheme for ideal magnetohydrodynamics equations using boundary variation diminishing algorithmA high-fidelity finite volume scheme based on the BVD (boundary variation diminishing) concept is proposed in this study to solve the ideal magnetohydrodynamics (MHD) equations. A hybrid spatial…Pan Chenxi, Song Sheng, Chen Chungang et al.·Apr 19, 2024SaveLearn
Deep reinforcement learning-based active flow control of an elliptical cylinder: transitioning from an elliptical cylinder to a circular cylinder and a flat plateWe study the adaptability of deep reinforcement learning (DRL)-based active flow control (AFC) technology for bluff body flows with complex geometries. It is extended from a cylinder with an aspect…Wang Jia, Hang Xu·Apr 19, 2024SaveLearn
Physics-Informed Neural Networks for Multi-Phase Flow in Porous Media Considering Dual Shocks and Interphase SolubilityPhysics-Informed Neural Networks (PINNs) integrate physical principles into machine learning, finding wide applications in various science and engineering fields. However, solving nonlinear…Jingjing Zhang, Ulisses Braga-Neto, Eduardo Gildin·Apr 18, 2024SaveLearn
On the problem of optimal fluid transport in capillariesIn this note, we revisit the problem of the pressure-driven transport of a meniscus through a narrow cylindrical capillary or pore. This generic process finds many applications in science and…Mathis Fricke, Clara Bernklau, Elisabeth Diehl et al.·Apr 18, 2024SaveLearn
Helicity oscillations in Rayleigh-B\'enard convection of liquid metal in a cell with aspect ratio 0.5In this paper, we present numerical and experimental results on helicity oscillations in a liquid-metal Rayleigh-B\'enard (RB) convection cell, with an aspect ratio of 0.5. We find that helicity…R. Mitra, F. Stefani, V. Galindo et al.·Apr 18, 2024SaveLearn
Robust and Adaptive Deep Reinforcement Learning for Enhancing Flow Control around a Square Cylinder with Varying Reynolds NumbersThe present study applies a Deep Reinforcement Learning (DRL) algorithm to Active Flow Control (AFC) of a two-dimensional flow around a confined square cylinder. Specifically, the Soft Actor-Critic…Wang Jia, Hang Xu·Apr 18, 2024SaveLearn
Transport scaling in porous media convectionWe present a theory to describe the Nusselt number (Nu), corresponding to the heat or mass flux, as a function of the Rayleigh--Darcy number (Ra), the ratio of buoyant driving force over…Xiaojue Zhu, Yifeng Fu, Marco De Paoli·Apr 18, 2024SaveLearn
Edge-wave phase-shifts versus normal-mode phase-tilts in an Eady problem with a sloping boundaryOne mechanistic interpretation of baroclinic instability is that of mutual constructive interference of Rossby edge-waves. While the two edge-waves and their relative phase-shifts are invoked as part…Julian Mak, Nili Harnik, Eyal Heifetz et al.·Apr 18, 2024SaveLearn
Prolate spheroids settling in a quiescent fluid: clustering, microstructures and collisionsIn this study, we investigate the sedimentation of prolate spheroids in a quiescent fluid by means of the particle-resolved direct numerical simulation. With the increase of the particle volume…Xinyu Jiang, Chunxiao Xu, Lihao Zhao·Apr 18, 2024SaveLearn
An Invitation to Resolvent AnalysisResolvent analysis is a powerful tool that can reveal the linear amplification mechanisms between the forcing inputs and the response outputs about a base flow. These mechanisms can be revealed in…Laura Victoria Rolandi, Jean Hélder Marques Ribeiro, Chi-An Yeh et al.·Apr 17, 2024SaveLearn
Direct measurement of energy transfer in strongly driven rotating turbulenceA short, abrupt increase in energy injection rate into steady strongly-driven rotating turbulent flow is used as a probe for energy transfer in the system. The injected excessive energy is localized…Omri Shaltiel, Alon Salhov, Omri Gat et al.·Apr 17, 2024SaveLearn
Data-driven computation of adjoint sensitivities without adjoint solvers: An application to thermoacousticsAdjoint methods have been the pillar of gradient-based optimization for decades. They enable the accurate computation of a gradient (sensitivity) of a quantity of interest with respect to all…Defne E. Ozan, Luca Magri·Apr 17, 2024SaveLearn
Large-scale semi-organized rolls in a sheared convective turbulence: Mean-field simulationsBased on a mean-field theory of a non-rotating turbulent convection (Phys. Rev. E 66, 066305, 2002), we perform mean-field simulations (MFS) of sheared convection which takes into account an…A. Asulin, E. Tkachenko, N. Kleeorin et al.·Apr 17, 2024SaveLearn
Thermographic study of freezing water drops: An insight on Mpemba effectDespite decades of research, the Mpemba Effect challenges scientists, prompting further investigation and refinement of existing hypotheses. This work uses optical tools such as thermography to…Argelia Balbuena Ortega, Emiliano Hernández-Figueroa, J. Antonio del Río·Apr 17, 2024SaveLearn
High-order meshless global stability analysis of Taylor-Couette flows in complex domainsRecently, meshless methods have become popular in numerically solving partial differential equations and have been employed to solve equations governing fluid flows, heat transfer, and species…Akash Unnikrishnan, Vinod Narayanan, Surya Pratap Vanka·Apr 17, 2024SaveLearn
Experimentally informed, linear mean-field modelling of circular cylinder aeroacousticsA noise modelling approach is proposed for bluff body wakes such as flow over a cylinder, where the primary noise source comprises large-scale coherent structures such as the vortex shedding flow…Robin Prinja, Peter Jordan, Florent Margnat·Apr 17, 2024SaveLearn
Understanding the instability-wave selectivity of hypersonic compression ramp laminar flowThe hypersonic flow stability over a two-dimensional compression corner is studied using resolvent analysis, linear stability theory (LST) and parabolised stability equation (PSE). The authors find…Peixu Guo, Jiaao Hao, Chih-Yung Wen·Apr 17, 2024SaveLearn
Evaluation of Vortex Criteria by Virtue of the Quadruple Decomposition of Velocity Gradient TensorBased on the analysis of the velocity gradient tensor, we investigate in this paper the physical interpretation and limitations of four vortex criteria: ω, Q, and λci,…Zhen Li, Xiwen Zhang, Feng He·Apr 17, 2024SaveLearn
Multi-Physics Numerical Analysis of Single-phase Immersion Cooling for Thermal Management of Li-Ion BatteriesBattery thermal management systems (BTMSs) are critical for efficient and safe operation of lithium-ion batteries (LIBs), especially for fast charging/discharging applications that generate…Piyush Mani Tripathi, Amy M. Marconnet·Apr 17, 2024SaveLearn
Dynamics of an oscillatory boundary layer over a sediment bed in Euler-Lagrange simulationsWe investigate the dynamics of an oscillatory boundary layer developing over a bed of collisional and freely evolving sediment grains. We perform Euler-Lagrange simulations at Reynolds numbers…Jonathan S. Van Doren, M. Houssem Kasbaoui·Apr 16, 2024SaveLearn
Uncertainty Quantification of Super-Resolution Flow Mapping in Liquid Metals using Ultrasound Localization MicroscopyConvection of liquid metals drives large natural processes and is important in technical processes. Model experiments are conducted for research purposes where simulations are expensive and the…David Weik, Zehua Dou, Dirk Räbiger et al.·Apr 16, 2024SaveLearn
Is There a Scaling Law in the Inviscid Coalescence of Unequal-size Droplets?This work examines the coalescence of two unequal-size spherical liquid droplets in the inviscid regime, with an emphasis on exploring the scaling of the liquid bridge evolution. Our experiment…Xi Xia, Yicheng Chi, Peng Zhang·Apr 16, 2024SaveLearn
Numerical validation of the inverse cascade of surface gravity wave actionWe report numerical simulations of surface gravity waves forced at small scale and the subsequent inverse cascade of wave action. We combine the spectral approach to simulating weakly nonlinear waves…CHristopher Higgins, Basile Gallet·Apr 16, 2024SaveLearn
Efficient point-based simulation of four-way coupled particles in turbulence at high number densityIn many natural and industrial applications, turbulent flows encompass some form of dispersed particles. Although this type of multiphase turbulent flow is omnipresent, its numerical modeling has…Xander M. de Wit, Rudie P. J. Kunnen, Herman J. H. Clercx et al.·Apr 16, 2024SaveLearn
Friction and heat transfer in forced air convection with variable physical propertiesWe establish a theoretical framework for predicting friction and heat transfer coefficients in variable-properties forced air convection. Drawing from concepts in high-speed wall turbulence, which…Davide Modesti, Sergio Pirozzoli·Apr 16, 2024SaveLearn