Deep reinforcement learning of airfoil pitch control in a highly disturbed environment using partial observationsThis study explores the application of deep reinforcement learning (RL) to design an airfoil pitch controller capable of minimizing lift variations in randomly disturbed flows. The controller,…Diederik Beckers, Jeff D. Eldredge·Apr 1, 2024SaveLearn
Inferring parameters and reconstruction of two-dimensional turbulent flows with physics-informed neural networksObtaining system parameters and reconstructing the full flow state from limited velocity observations using conventional fluid dynamics solvers can be prohibitively expensive. Here we employ machine…Vladimir Parfenyev, Mark Blumenau, Ilia Nikitin·Apr 1, 2024SaveLearn
Covering convection with thermal blankets: fluid-structure interactions in thermal convectionThe continental plates of Earth are known to drift over a geophysical timescale, and their interactions have lead to some of the most spectacular geoformations of our planet while also causing…Jinzi Mac Huang·Apr 1, 2024SaveLearn
Oscillating flow around a circular cylindrical post confined between two parallel platesThis work is motivated by the interest in determining the effect of the micro-anatomy of the spinal subarachnoid space on the cerebrospinal fluid flow and on the associated transport of solutes. To…Antonio José Bárcenas-Luque, Francisco Moral-Pulido, Cándido Gutiérrez-Montes et al.·Apr 1, 2024SaveLearn
Numerical modelling of flame spread over thin circular ductsThis paper presents a numerical investigation into the phenomenon of flame spread over thin circular ducts in normal gravity and microgravity environments. Flame spread over such geometry is of…Vipin Kumar, Kambam Naresh, Amit Kumar·Apr 1, 2024SaveLearn
VortexViz: Finding Vortex Boundaries by Learning from Particle TrajectoriesVortices are studied in various scientific disciplines, offering insights into fluid flow behavior. Visualizing the boundary of vortices is crucial for understanding flow phenomena and detecting flow…Akila de Silva, Nicholas Tee, Omkar Ghanekar et al.·Apr 1, 2024SaveLearn
Active flow control of a turbulent separation bubble through deep reinforcement learningThe control efficacy of classical periodic forcing and deep reinforcement learning (DRL) is assessed for a turbulent separation bubble (TSB) at Reτ=180 on the upstream region before separation…Bernat Font, Francisco Alcántara-Ávila, Jean Rabault et al.·Mar 29, 2024SaveLearn
Hydroelectric energy conversion of waste flows through hydroelectronic dragHydraulic energy is a key component of the global energy mix, yet there exists no practical way of harvesting it at small scales, from flows at low Reynolds number. This has triggered the search for…Baptiste Coquinot, Lydéric Bocquet, Nikita Kavokine·Mar 29, 2024SaveLearn
An enthalpy-based model for the physics of ice crystal icingIce crystal icing (ICI) in aircraft engines is a major threat to flight safety. Due to the complex thermodynamic and phase-change conditions involved in ICI, rigorous modelling of the accretion…Timothy Peters, Josh Shelton, Hui Tang et al.·Mar 29, 2024SaveLearn
Rise and fall of a multicomponent droplet in a surrounrdfing fluid: simulation study of a bumpy pathThe coupling between mass transfer and hydrodynamic phenomena in two-phase flow is not necessarily straightforward due to the different effects that can be encountered. The treatment of such coupling…Mirantsoa Aimé Rasolofomanana, Romain Le Tellier, Hervé Henry·Mar 29, 2024SaveLearn
Depth from Defocus Technique for High Number Densities and Non-spherical ParticlesThe Depth from Defocus (DFD) imaging technique for measuring the size and number concentration of particles in a dispersed two-phase flow has up to now been restricted to relatively sparse particle…Rixin Xua, Zuojie Huanga, Wenchao Gonga et al.·Mar 29, 2024SaveLearn
One dimensional models for supercritical and subcritical transitions in rotating convectionNumerous study on natural and man made systems including rotating convection report the phenomena of supercritical and subcritical transitions from one state to another with the variation of relevant…Sutapa Mandal, Snehashish Sarkar, Pinaki Pal·Mar 29, 2024SaveLearn
On the Preprocessing of Physics-informed Neural Networks: How to Better Utilize Data in Fluid MechanicsPhysics-Informed Neural Networks (PINNs) serve as a flexible alternative for tackling forward and inverse problems in differential equations, displaying impressive advancements in diverse areas of…Shengfeng Xu, Chang Yan, Zhenxu Sun et al.·Mar 29, 2024SaveLearn
Generalisation of the Spectral Difference scheme for the diffused-interface five equation modelThe present work focuses on the generalisation of the Spectral Difference (SD) scheme to the reduced Baer-Nunziato system known as five-equation model for the simulation of two immiscible…Niccolò Tonicello, Guido Lodato, Matthias Ihme·Mar 28, 2024SaveLearn
Natural convection in a vertical channel. Part 1. Wavenumber interaction and Eckhaus instability in a narrow domainIn a vertical channel driven by an imposed horizontal temperature gradient, numerical simulations have previously shown steady, time-periodic and chaotic dynamics. We explore the observed dynamics by…Zheng Zheng, Laurette S. Tuckerman, Tobias M. Schneider·Mar 28, 2024SaveLearn
Natural convection in a vertical channel. Part 2. Oblique solutions and global bifurcations in a spanwise-extended domainVertical thermal convection is a non-equilibrium system in which both buoyancy and shear forces play a role in driving the convective flow. Beyond the onset of convection, the driven dissipative…Zheng Zheng, Laurette S. Tuckerman, Tobias M. Schneider·Mar 27, 2024SaveLearn
Kinetic data-driven approach to turbulence subgrid modelingNumerical simulations of turbulent flows are well known to pose extreme computational challenges due to the huge number of dynamical degrees of freedom required to correctly describe the complex…Giulio Ortali, Alessandro Gabbana, Nicola Demo et al.·Mar 27, 2024SaveLearn
Controlling the chaotic wake of a flapping foil by tuning its chordwise flexibilityEffects of chord-wise flexibility as an instrument to control chaotic transitions in the wake of a flexible flapping foil have been studied here using an immersed boundary method-based in-house…Chhote Lal Shah, Dipanjan Majumdar, Chandan Bose et al.·Mar 26, 2024SaveLearn
Scaling of high-Rayleigh-number convection based on internal convective boundary layerWe propose a phenomenological model for thermal convection at high Rayleigh numbers. It hypothesizes existence of a high-Reynolds-number turbulent boundary layer near each horizontal plate, which is…Chenning Tong·Mar 26, 2024SaveLearn
The memory of Rayleigh-Taylor turbulenceIn this work, we consider the problem of inferring the initial conditions of a Rayleigh-Taylor mixing zone by measuring the 0D turbulent quantities at an unspecified time. To this aim, we have…S. Thévenin, B. -J. Gréa, G. Kluth et al.·Mar 26, 2024SaveLearn
Mean temperature profiles in turbulent internal flowsWe derive explicit formulas for the mean profiles of temperature (modeled as a passive scalar) in forced turbulent convection, as a function of the Reynolds and Prandtl numbers. The derivation…Sergio Pirozzoli, Davide Modesti·Mar 26, 2024SaveLearn
Gravito-capillary pinning of pendant droplets under wet uneven surfacesPendant drops spontaneously appear on the underside of wet surfaces through the Rayleigh-Taylor instability. These droplets have no contact line, they are connected to a thin liquid film with which…Etienne Jambon-Puillet·Mar 26, 2024SaveLearn
Deep learning-based predictive modelling of transonic flow over an aerofoilEffectively predicting transonic unsteady flow over an aerofoil poses inherent challenges. In this study, we harness the power of deep neural network (DNN) models using the attention U-Net…Li-Wei Chen, Nils Thuerey·Mar 25, 2024SaveLearn
A Mathematical Description of the Quasi-Periodically Developed Heat Transfer Regime in Channels with Arrays of Periodic Solid StructuresIn this article, we present the governing equations for the temperature field upstream and downstream of the periodically developed flow region in channels with arrays of periodic solid structures.…Geert Buckinx·Mar 25, 2024SaveLearn
Entropy-conservative high-order methods for high-enthalpy gas flowsA framework for numerical evaluation of entropy-conservative volume fluxes in gas flows with internal energies is developed, for use with high-order discretization methods. The novelty of the…Georgii Oblapenko, Manuel Torrilhon·Mar 25, 2024SaveLearn