Spanwise wall forcing can reduce turbulent heat transfer more than dragDirect numerical simulations are performed of turbulent forced convection in a half channel flow with wall oscillating either as a spanwise plane oscillation or to generate a streamwise travelling…Amirreza Rouhi, Marcus Hultmark, Alexander J. Smits·Jun 14, 2024SaveLearn
Settling of two rigidly connected spheresLaboratory experiments and particle-resolved simulations are employed to investigate the settling dynamics of a pair of rigidly connected spherical particles of unequal size. They yield a detailed…Zachary Maches, Morgane Houssais, Alban Sauret et al.·Jun 14, 2024SaveLearn
Asymptotic scaling laws for periodic turbulent boundary layers and their numerical simulation up to Retheta = 8300We provide a rigorous analysis of the self-similar solution of the temporal turbulent boundary layer, recently proposed in [2], in which a body force is used to maintain a statistically steady…Andrew Wynn, Saeed Parvar, Joseph O Connor et al.·Jun 14, 2024SaveLearn
Modelling Wind Turbines via Actuator Lines in High-Order h/p SolversThis paper compares two actuator line methodologies for modelling wind turbines employing high-order h/p solvers and large-eddy simulations. The methods combine the accuracy of high-order solvers (in…Oscar A. Marino, Raúl Sanz, Stefano Colombo et al.·Jun 14, 2024SaveLearn
Chaotic measures as an alternative to spectral measures for analysing turbulent flowTurbulence has associated chaotic features. In the past couple of decades there has been growing interest in the study of these features as an alternative means of understanding turbulent systems.…Richard D. J. G. Ho, Daniel Clark, Arjun Berera·Jun 14, 2024SaveLearn
Sensitivities of Free-Air RANS and DDES Methods on the High-Lift NASA CRMTo reduce the time-to-market of future aircraft, it is crucial to predict the flight envelope accurately before building prototypes for flight tests. The High-Lift Prediction Workshop (HLPW) series…Markus Zauner, Andrea Sansica, Tomoaki Matsuzaki et al.·Jun 14, 2024SaveLearn
FGM modeling considering preferential diffusion, flame stretch, and non-adiabatic effects for hydrogen-air premixed flame wall flashbackPreferential diffusion plays an important role especially in hydrogen flames. Flame stretch significantly affects the flame structure and induces preferential diffusion. A problematic phenomenon…Kazuhiro Kinuta, Reo Kai, Kotaro Yada et al.·Jun 14, 2024SaveLearn
Modeling the effect of vorticity on inhaled transport in the upper airwayLocalized vortices can have significant influence on transport of inhaled particles through the upper respiratory tract. These vortices have complex three-dimensional structure with details dependent…Saikat Basu, Leonardo P Chamorro, Mohammad Yeasin et al.·Jun 14, 2024SaveLearn
A novel Cercignani-Lampis boundary model for discrete velocity methods in predicting rarefied and multi-scale flowsTo extend the discrete velocity method (DVM) and unified methods to more realistic boundary conditions, a Cercignani-Lampis (CL) boundary with different momentum and thermal energy accommodations is…Jianfeng Chen, Sha Liu, Rui Zhang et al.·Jun 13, 2024SaveLearn
Discovery of knowledge of wall-bounded turbulence via symbolic regressionWith the development of high performance computer and experimental technology, the study of turbulence has accumulated a large number of high fidelity data. However, few general turbulence knowledge…ZhongXin Yang, XiangLin Shan, WeiWei Zhang·Jun 13, 2024SaveLearn
Boundary sources of velocity gradient tensor and its invariantsThe present work elucidates the boundary behaviors of the velocity gradient tensor (A∇u) and its principal invariants (P,Q,R) for compressible flow interacting with a…Tao Chen, Jie-Zhi Wu, Tianshu Liu et al.·Jun 13, 2024SaveLearn
Field investigation of 3D snow settling dynamics under weak atmospheric turbulenceResearch on settling dynamics of snow particles, considering their complex morphologies and real atmospheric conditions, remains scarce despite extensive simulations and laboratory studies. Our study…Jiaqi Li, Michele Guala, Jiarong Hong·Jun 13, 2024SaveLearn
Expressing turbulent kinetic energy as coarse-grained enstrophy or strain deformationsIn turbulent flows, the fluid element gets deformed by chaotic motion due to the formation of sharp velocity gradients. A direct connection between the element of fluid stresses and the energy…Damiano Capocci·Jun 12, 2024SaveLearn
Scaling Analysis of the Swirling Wake of a Porous Disc: Application to Wind TurbinesWe report a comprehensive study of the wake of a porous disc, the design of which has been modified to incorporate a swirling motion at an inexpensive cost. The swirl intensity is passively…Ernesto Fuentes Noriega, Nicolas Mazellier·Jun 12, 2024SaveLearn
Adaptively Implicit Advection for Atmospheric FlowsImplicit time-stepping for advection is applied locally in space and time where Courant numbers are large, but standard explicit time-stepping is used for the remaining solution which is typically…Hilary Weller, Christian Kuehnlein, Piotr K. Smolarkiewicz·Jun 12, 2024SaveLearn
Chemical Timescale Effects on Detonation ConvergenceNumerical simulations of detonation-containing flows have emerged as crucial tools for designing next-generation power and propulsion devices. As these tools mature, it is important for the…Shivam Barwey, Michael Ullman, Ral Bielawski et al.·Jun 12, 2024SaveLearn
Canard explosions in turbulent thermo-fluid systemsA sudden transition to a state of high amplitude limit cycle oscillations is catastrophic in a thermo-fluid system. Conventionally, upon varying the control parameter, a sudden transition is observed…Ramesh S. Bhavi, Sivakumar Sudarsanan, Manikandan Raghunathan et al.·Jun 12, 2024SaveLearn
Critical behavior and multistability in quasi-two-dimensional turbulenceTwo-dimensional (2D) turbulence, despite being an idealization of real flows, is of fundamental interest as a model of the spontaneous emergence of order from chaotic flows. The emergence of order…Filip Novotný, Marek Talíř, Šimon Midlik et al.·Jun 12, 2024SaveLearn
Wobbling and Migrating Ferrofluid DropletsActive components incorporated in materials generate motion by inducing conformational changes in response to external fields. Magnetic fields are particularly interesting as they can actuate…Aaveg Aggarwal, Shih-Yuan Chen, Eleftherios Kirkinis et al.·Jun 12, 2024SaveLearn
Linear stability theory and molecular simulations of nanofilm dewetting with disjoining pressure, strong liquid-solid slip, and thermal fluctuationsThe dewetting of thin nanofilms is significantly impacted by thermal fluctuations, liquid-solid slip, and disjoining pressure, which can be described by lubrication equations augmented by…Yixin Zhang·Jun 12, 2024SaveLearn
High-Precision Surrogate Modeling for Uncertainty Quantification in Complex Slurry FlowsSlurry transportation via pipelines is essential for global industries, offering efficiency and environmental benefits. Specifically, the precise calibration of physical parameters for transporting…Marwane Elkarii, Radouan Boukharfane, Nabil El Moçayd·Jun 11, 2024SaveLearn
Identification of cross-frequency interactions in compressible cavity flow using harmonic resolvent analysisThe resolvent analysis reveals the worst-case disturbances and the most amplified response in a fluid flow that can develop around a stationary base state. The recent work by Padovan et al.(2020)…Md Rashidul Islam, Yiyang Sun·Jun 11, 2024SaveLearn
Intrinsic compressibility effects in near-wall turbulenceThe impact of intrinsic compressibility effects -- changes in fluid volume due to pressure variations -- on high-speed wall-bounded turbulence has often been overlooked or incorrectly attributed to…Asif Manzoor Hasan, Pedro Costa, Johan Larsson et al.·Jun 11, 2024SaveLearn
Non-equilibrium fluctuations of the direct cascade in Surface Quasi Geostrophic turbulenceWe study the temporal fluctuations of the flux of surface potential energy in Surface Quasi-Geostrophic (SQG) turbulence. By means of high-resolution, direct numerical simulations of the SQG model in…V. J. Valadão, T. Ceccotti, G. Boffetta et al.·Jun 11, 2024SaveLearn
Spectral Methods for Coastal-Trapped Waves and Instabilities in a Background FlowHere we present a numerical method for finding non-hydrostatic coastal-trapped wave and instability solutions to the non-hydrostatic Boussinesq equations in the presence of a background flow and…Matthew N. Crowe, Edward R. Johnson·Jun 11, 2024SaveLearn