Unveiling the bi-stable character of stealthy hydrogen-air flamesUltra-lean hydrogen-air flames propagating in narrow gaps, under the influence of cold walls and high preferential diffusion, can form two distinct isolated structures. They exhibit either circular…Ruben Palomeque-Santiago, Alba Dominguez-Gonzalez, Daniel Martinez-Ruiz et al.·Aug 1, 2024SaveLearn
Mesoscopic hydrodynamic model for spreading, sliding and coarsening compound dropsWe revisit the mesoscopic hydrodynamic description of the dynamics of sessile partially wetting compound drops, i.e., of drops that consist of two immiscible nonvolatile partially wetting liquids and…Jan Diekmann, Uwe Thiele·Aug 1, 2024SaveLearn
Lack of self-similarity in transverse velocity increments and circulation statistics in two-dimensional turbulenceWe study the statistics of longitudinal and transverse structure functions, as well as velocity circulation in the inverse energy cascade of two-dimensional turbulence. By means of direct numerical…Nicolás Pablo Müller, Giorgio Krstulovic·Aug 1, 2024SaveLearn
Gradient dynamics model for drops of volatile liquid on a porous substrateWe present a mesoscopic hydrodynamic model for a spreading drop of volatile partially wetting liquid on a solid porous layer of small thickness. Thereby, evaporation takes place under strong…Simon Hartmann, Uwe Thiele·Jul 31, 2024SaveLearn
Investigation of Surfactant-Laden Bubble Migration Dynamics in Self-Rewetting Fluids using Lattice Boltzmann MethodSelf-rewetting fluids (SRFs) (e.g., aqueous solutions of long-chain alcohols) show anomalous nonlinear (quadratic) variations of surface tension with temperature involving a positive gradient,…Bashir Elbousefi, William Schupbach, Kannan N. Premnath et al.·Jul 31, 2024SaveLearn
Developing a Model-Consistent Reduced-Dimensionality training approach to quantify and reduce epistemic uncertainty in separated flowsThis proposed work introduces a data-assimilation-assisted approach to train neural networks, aimed at effectively reducing epistemic uncertainty in state estimates of separated flows. This method,…Minghan Chu·Jul 31, 2024SaveLearn
Transition reversal over a blunt plate at Mach 5In this work, the stability and transition to turbulence over a blunt flat plate with different leading-edge radii are investigated computationally. The freestream Mach number is 5, the unit Reynolds…Peixu Guo, Jiaao Hao, Chih-Yung Wen·Jul 31, 2024SaveLearn
Multi-agent reinforcement learning for the control of three-dimensional Rayleigh-B\'enard convectionDeep reinforcement learning (DRL) has found application in numerous use-cases pertaining to flow control. Multi-agent RL (MARL), a variant of DRL, has shown to be more effective than single-agent RL…Joel Vasanth, Jean Rabault, Francisco Alcántara-Ávila et al.·Jul 31, 2024SaveLearn
A phase-field model for wet snow metamorphismThe microstructure of snow determines its fundamental properties such as the mechanical strength, reflectivity, or the thermo-hydraulic properties. Snow undergoes continuous microstructural changes…Adrian Moure, Xiaojing Fu·Jul 30, 2024SaveLearn
Pattern Formation of Freezing Infiltration in Porous MediaGravity-driven infiltration of liquid water into unsaturated porous media can be a spatially heterogeneous process due to the gravity fingering instability. When such infiltration occurs in a…Nathan Jones, Adrian Moure, Xiaojing Fu·Jul 30, 2024SaveLearn
A Stochastic Precipitating Quasi-Geostrophic ModelEfficient and effective modeling of complex systems, incorporating cloud physics and precipitation, is essential for accurate climate modeling and forecasting. However, simulating these systems is…Nan Chen, Changhong Mou, Leslie M. Smith et al.·Jul 30, 2024SaveLearn
Multi-Fidelity Bayesian Optimisation of Wind Farm Wake Steering using Wake Models and Large Eddy SimulationsImproving the power output from wind farms is vital in transitioning to renewable electricity generation. However, in wind farms, wind turbines often operate in the wake of other turbines, leading to…Andrew Mole, Sylvain Laizet·Jul 30, 2024SaveLearn
A discussion on the critical electric Rayleigh number for AC electrokinetic flow of binary fluids in a divergent microchannelElectrokinetic (EK) flow is a type of flow driven or manipulated by electric body forces, influenced by various factors such as electric field intensity, electric field form, frequency, electric…Jinan Pang, Yu Han, Bo Sun et al.·Jul 30, 2024SaveLearn
AhmedML: High-Fidelity Computational Fluid Dynamics Dataset for Incompressible, Low-Speed Bluff Body AerodynamicsThe development of Machine Learning (ML) methods for Computational Fluid Dynamics (CFD) is currently limited by the lack of openly available training data. This paper presents a new open-source…Neil Ashton, Danielle C. Maddix, Samuel Gundry et al.·Jul 30, 2024SaveLearn
Evaporation limited spreading of ethanol on rectangular porous strips: an experimental and theoretical investigationWicking is a widely studied process in both natural and artificial systems. In many industrial applications, such as heat pipes, the wicking liquid evaporates to regulate temperature effectively.…Rampally Srirama Chandra Murthy, Navneet Kumar·Jul 30, 2024SaveLearn
Large-Scale Horizontal Axis Wind Turbine Aerodynamic Efficiency Optimization using Active Flow Control and Synthetic JetsEfficiency increase is seen as one of the main goals in any energy converting device. In this direction, the present study aims to demonstrate that large-scale wind turbines can still be improved in…Ahmad Nabhani, Navid M Tousi, Marti Coma et al.·Jul 30, 2024SaveLearn
Effects of turbulence boundary conditions on Spalart-Allmaras RANS simulations for active flow control applicationsWe assess the suitability of Reynolds-Averaged Navier-Stokes (RANS) simulation using the Spallart-Almaras (SA) turbulence model as a closure in analysing the performance of fluidic Active Flow…Navid Monshi Tousi, Josep M. Bergada, Fernando Mellibovsky·Jul 30, 2024SaveLearn
Convection in the active layer speeds up permafrost thaw in coarse grained soilsPermafrost thaw is a major concern raised by the ongoing climate change. An understudied phenomenon possibly affecting the pace of permafrost thaw is the onset of convective motions within the active…Marta Magnani, Stefano Musacchio, Antonello Provenzale et al.·Jul 30, 2024SaveLearn
Superposition of system response in modulated turbulent plane Couette flowTraditionally, the response of a turbulent flow to modulated perturbations is expected to be complex. We conduct direct numerical simulations of turbulent Plane Couette flow, the shear flow between…Wasy Akhtar, Rodolfo Ostilla-Monico·Jul 30, 2024SaveLearn
Gravity-driven viscous flow over partially lubricated bedWe present an investigation into the response of a viscous fluid flowing over a sloped bed across a spatially finite patch of basal lubrication. We present a simple analytical model that captures the…Joshua H. Rines, Ching-Yao Lai, Yongji Wang·Jul 30, 2024SaveLearn
Marangoni-driven freezing dynamics of supercooled binary dropletsSolidification of droplets is of great importance to various technological applications, drawing considerable attention from scientists aiming to unravel the fundamental physical mechanisms. In the…Feng Wang, Hao Zeng, Yihong Du et al.·Jul 30, 2024SaveLearn
Wind turbine enhancement via Active Flow Control ImplementationThe present research aims to enhance the efficiency of a DTU-10MW Horizontal Axis Wind Turbine (HAWT) via Active Flow Control (AFC) implementation and using Synthetic Jets (SJ). In the initial part…Marc Lahoz, Ahmad Nabhani, Mohammad Saemian et al.·Jul 29, 2024SaveLearn
A unified framework for N-phase Navier-Stokes Cahn-Hilliard Allen-Cahn mixture models with non-matching densitiesOver the past few decades, numerous N-phase incompressible diffuse-interface flow models with non-matching densities have been proposed. Despite aiming to describe the same physics, these models are…M. F. P. ten Eikelder·Jul 29, 2024SaveLearn
POREMAPS: A finite difference based Porous Media Anisotropic Permeability Solver for Stokes flowPorous materials are ubiquitous in various engineering and geological applications, where their permeability plays a critical role in viscous fluid flow and transport phenomena. Understanding and…David Krach, Matthias Ruf, Holger Steeb·Jul 29, 2024SaveLearn
Utility of High-Order Scheme for Unsteady Flow Simulations: Comparison with Second-Order ToolThe objective of this work is to investigate the utility and effectiveness of the high-order scheme for simulating unsteady turbulent flows. To achieve it, the studies were conducted from two…Peng Jiang, Yichen Huang, Yong Cao et al.·Jul 29, 2024SaveLearn