High fidelity simulations of unstart phenomena in a scramjet inlet due to angle of attackThis work investigates the unsteady behavior of unstart phenomena within a scramjet inlet using advanced computational techniques. Scramjets and ramjets, with their reliance on inlet compression,…Jeremy Redding, Emma Cavanaugh, Luis Bravo et al.·May 27, 2024SaveLearn
Active flow control for drag reduction through multi-agent reinforcement learning on a turbulent cylinder at ReD=3900This study presents novel drag reduction active-flow-control (AFC) strategies for a three-dimensional cylinder immersed in a flow at a Reynolds number based on freestream velocity and cylinder…P. Suárez, F. Álcantara-Ávila, A. Miró et al.·May 27, 2024SaveLearn
A note on the error analysis of data-driven closure models for large eddy simulations of turbulenceIn this work, we provide a mathematical formulation for error propagation in flow trajectory prediction using data-driven turbulence closure modeling. Under the assumption that the predicted state of…Dibyajyoti Chakraborty, Shivam Barwey, Hong Zhang et al.·May 27, 2024SaveLearn
An experimental study of inflow stability in a falling soap filmInflow control is essential for most fluid mechanics experiments. Although vertically falling soap film flows have been extensively used in the last four decades to study two-dimensional flows, its…Yuna Hattori·May 27, 2024SaveLearn
Higher DNS-resolution requirements for expanded overlap region and confirmation of a convergence criterionDirect numerical simulations (DNS) stand out as formidable tools in studying turbulent flows. Despite the fact that the achievable Reynolds number remains lower than those available through…Sergio Hoyas, Ricardo Vinuesa, Peter Schmid et al.·May 27, 2024SaveLearn
On The Implicit Large Eddy Simulation of Turbomachinery Flows Using The Flux Reconstruction MethodA high-order flux reconstruction solver has been developed and validated to perform implicit large-eddy simulations of industrially representative turbomachinery flows. The T106c low-pressure turbine…Feng Wang·May 27, 2024SaveLearn
Flow control of three-dimensional cylinders transitioning to turbulence via multi-agent reinforcement learningDesigning active-flow-control (AFC) strategies for three-dimensional (3D) bluff bodies is a challenging task with critical industrial implications. In this study we explore the potential of…P. Suárez, F. Alcántara-Ávila, J. Rabault et al.·May 27, 2024SaveLearn
How "mixing" affects propagation and structure of intensely turbulent, lean, hydrogen-air premixed flamesUnderstanding how intrinsically fast hydrogen-air premixed flames can be rendered much faster in turbulence is crucial for systematically developing hydrogen-based gas turbines and spark ignition…Yuvraj, Hong G. Im, Swetaprovo Chaudhuri·May 27, 2024SaveLearn
Drag, lift, and torque correlations for axi-symmetric rod-like non-spherical particles in linear wall-bounded shear flowThis paper presents novel correlations to predict the drag, lift, and torque coefficients of axi-symmetric non-spherical rod-like particles in a wall-bounded linear shear flow. The particle position…Victor Chéron, Berend van Wachem·May 27, 2024SaveLearn
A general model for spin coating on a non-axisymmetric curved substrateWe derive a generalised asymptotic model for the flow of a thin fluid film over an arbitrarily-parameterised non-axisymmetric curved substrate surface based on the lubrication approximation. In…Ross G. Shepherd, Edouard Boujo, Mathieu Sellier·May 27, 2024SaveLearn
Free energy formulas for confined nematic liquid crystals based on analogies with Kirchhoff-Routh theory in vortex dynamicsActive nematics are influenced by alignment angle singularities called topological defects. The localization of these defects is of major interest for biological applications. The total distortion of…Hiroyuki Miyoshi, Hiroki Miyazako, Takaaki Nara·May 27, 2024SaveLearn
Odd viscous flow past a sphere at low but nonzero Reynolds numbersMeasuring lift force on symmetrically shaped obstacles immersed in laminar flow is the quintessential way of signalling odd viscosity. For flow past cylinders, such a lift force does not arise when…Ruben Lier·May 26, 2024SaveLearn
Physics Constrained Deep Learning For Turbulence Model Uncertainty QuantificationEngineering design and scientific analysis rely upon computer simulations of turbulent fluid flows using turbulence models. These turbulence models are empirical and approximate, leading to large…Minghan Chu, Weicheng Qian·May 26, 2024SaveLearn
A new dynamic slip approach for wall-modeled Large Eddy Simulations in a Consistent Discontinuous Galerkin FrameworkA wall-modeled large eddy simulation approach is proposed in a Discontinuous Galerkin (DG) setting, building on the slip-wall concept of Bae et al. (JFM'19) and the universal scaling relationship by…Pratikkumar Raje, Karthik Duraisamy·May 24, 2024SaveLearn
Analysis of thermochemical non-equilibrium hypersonic flow over a waverider with uncertainty quantificationThe objective of this work is to assess the impact of parameter uncertainty on hypersonic aerothermal surface heating predictions in Reynolds-Averaged Navier-Stokes (RANS) simulations using…Jeremy Redding, Nick Plewacki, Himakar Ganti et al.·May 24, 2024SaveLearn
Causal features in turbulent channel flowThe causal relevance of local flow conditions in wall-bounded turbulence is analysed using ensembles of interventional experiments in which the effect of perturbing the flow within a small cell is…Kosuke Osawa, Javier Jimenez·May 24, 2024SaveLearn
Slow linear shear flow past discrete particles adhered to a plane wallLinear shear flow bounded by a plane wall is an idealization that occurs in microfluidic devices and many other applications. Perfect plane approximation neglects surface irregularities and discrete…Itzhak Fouxon, Alexander M. Leshansky·May 24, 2024SaveLearn
pyLOM: A HPC open source reduced order model suite for fluid dynamics applicationsThis paper describes the numerical implementation in a high-performance computing environment of an open-source library for model order reduction in fluid dynamics. This library, called pyLOM,…Benet Eiximeno, Arnau Miró, Beka Begiashvili et al.·May 24, 2024SaveLearn
Thermodynamics of surfactant-enriched binary-fluid systemsSurface-active agents (surfactants) release potential energy as they migrate from one of two adjacent fluids onto their fluid-fluid interface, a process that profoundly impacts the system's energy…T. B. van Sluijs, S. K. F. Stoter, E. H. van Brummelen·May 24, 2024SaveLearn
Unsteady aerodynamic prediction using limited samples based on transfer learningIn this study, a method for predicting unsteady aerodynamic forces under different initial conditions using a limited number of samples based on transfer learning is proposed, aiming to avoid the…Wen Ji, Xueyuan Sun, Chunna Li et al.·May 24, 2024SaveLearn
A Misleading Gallery of Fluid Motion by Generative Artificial IntelligenceIn this technical report, we extensively investigate the accuracy of outputs from well-known generative artificial intelligence (AI) applications in response to prompts describing common fluid motion…Ali Kashefi·May 24, 2024SaveLearn
Modeling of Hydroacoustic Noise from Marine Propellers with Tip Vortex CavitationThe present work aims to study the cavitating turbulent flow of a full-scale marine propeller and explore the physical mechanism underpinning the underwater radiated noise. We employ the standard…Zhi Cheng, Suraj Kashyap, Brendan Smoker et al.·May 24, 2024SaveLearn
Space-time statistics of 2D soliton gas in shallow water studied by stereoscopic surface mappingWe describe laboratory experiments in a 2D wave tank that aim at building up and monitor 2D shallow water soliton gas. The water surface elevation is obtained over a large ( 100\,m2)…Thibault Leduque, Eric Barthélemy, Hervé Michallet et al.·May 23, 2024SaveLearn
Utilizing indicator functions with computational data to confirm nature of overlap in normal turbulent stresses: logarithmic or quarter-powerIndicator functions of the streamwise normal-stress profiles (NSP), based on careful differentiation of some of the best direct numerical simulations (DNS) data from channel and pipe flows, over the…Hassan Nagib, Ricardo Vinuesa, Sergio Hoyas·May 23, 2024SaveLearn
Mathematical model of fluid front dynamics driven by porous media pumpsAir-permeable porous media hosts air within their pores. Upon removal from the interior of the material, these porous media have the tendency to reabsorb air from the surrounding, acting as a suction…Andreu Benavent-Claró, Yara Alvarez-Braña, Fernando Benito-Lopez et al.·May 23, 2024SaveLearn