354 citations · 5.2k across the 75 of their papers we have counts for
73 papers · 1 filter
Modeling wind farm noise emission and propagation: effects of flow and layout
J. Colas, A. Emmanuelli, D. Dragna +1
This study demonstrates how wind farm flow physics influence noise generation and downstream propagation through numerical simulations. The flow field is modeled using large-eddy s…
Wake-induced variations in noise levels and amplitude modulation for two interacting wind turbines
Jules Colas, Ariane Emmanuelli, Didier Dragna +1
The influence of turbine-turbine interactions on sound propagation is investigated using numerical simulations. Three configurations are examined: turbines aligned downstream of ea…
Scaling relations for heat and momentum transport in sheared Rayleigh-Bénard convection
Guru Sreevanshu Yerragolam, Christopher J. Howland, Richard J. A. M. Stevens +3
We provide scaling relations for the Nusselt number and the friction coefficient in sheared Rayleigh-Bénard convection, i.e., in Rayleigh-Bénard flow with Couette or P…
Wind turbine sound propagation: Comparison of a linearized Euler equations model with parabolic equation methods
Jules Colas, Ariane Emmanuelli, Didier Dragna +3
Noise generated by wind turbines is significantly impacted by its propagation in the atmosphere. Hence, for annoyance issues an accurate prediction of sound propagation is critical…
Characterization of natural convection between spherical shells
Luca Santelli, Guiquan Wang, Richard J. A. M. Stevens +1
In this manuscript, it is analysed the onset and evolution of natural convection of an incompressible fluid between spherical shells. The shells are kept at a fixed temperature dif…
The mean wind and potential temperature flux profiles in convective boundary layers
Luoqin Liu, Srinidhi N. Gadde, Richard J. A. M. Stevens
We develop innovative analytical expressions for the mean wind and potential temperature flux profiles in convective boundary layers (CBLs). CBLs are frequently observed during day…
Optimal heat transport in rotating Rayleigh-Bénard convection at large Rayleigh numbers
Robert Hartmann, Guru S. Yerragolam, Roberto Verzicco +2
The heat transport in rotating Rayleigh-Bénard convection (RBC) can be significantly enhanced for moderate rotation, i.e., for an intermediate range of Rossby numbers , compare…
Effect of a 2D Hill on the Propagation of Wind Turbine Noise
Jules Colas, Ariane Emmanuelli, Didier Dragna +2
A good understanding of wind turbine noise propagation is relevant to better measure the impact of turbines on the environment. In this study, we developed numerical simulations to…
A three-dimensional dynamic mode decomposition analysis of wind farm flow aerodynamics
Xuan Dai, Da Xu, Mengqi Zhang +1
High-fidelity large-eddy simulations are suitable to obtain insight into the complex flow dynamics in extended wind farms. In order to better understand these flow dynamics, we use…
Evaluating the accuracy of the actuator line model against blade element momentum theory in uniform inflow
Luoqin Liu, Lucas Franceschini, Daniel F. Oliveira +3
We evaluate the accuracy of the actuator line model (ALM) approach by performing simulations for the NREL~5~MW wind turbine in uniform inflow using three large eddy simulation code…
Enhanced wind-farm performance using windbreaks
Luoqin Liu, Richard J. A. M. Stevens
The flow speed-up generated by windbreaks can be used to increase the power production of wind turbines. However, due to the increased drag imposed by the windbreaks, their use in…
Strong alignment of prolate ellipsoids in Taylor-Couette flow
Martin P. A. Assen, Chong Shen Ng, Jelle B. Will +3
We report on the mobility and orientation of finite-size, neutrally buoyant prolate ellipsoids (of aspect ratio ) in Taylor-Couette flow, using interface resolved numerical si…
Off-center gravity induces large-scale flow patterns in spherical Rayleigh-Bénard
Guiquan Wang, Luca Santelli, Roberto Verzicco +2
Inspired by the hemispherical asymmetry observed in the Earth's inner core, we perform direct numerical simulations to study the effect of the gravity center offset in spherical Ra…
Diffusion-free scaling in rotating spherical Rayleigh-Bénard convection
Guiquan Wang, Luca Santelli, Detlef Lohse +2
Direct numerical simulations are employed to reveal three distinctly different flow regions in rotating spherical Rayleigh-Bénard convection. In the low-latitude region $\mathrm{I}…
Effect of low-level jet height on wind farm performance
Srinidhi N. Gadde, Richard J. A. M. Stevens
Low-level jets (LLJs) are the wind maxima in the lowest 50 to 1000 m of atmospheric boundary layers. Due to their significant influence on the power production of wind farms it is…
The effect of Prandtl number on turbulent sheared thermal convection
Alexander Blass, Pier Tabak, Roberto Verzicco +2
In turbulent wall sheared thermal convection, there are three different flow regimes, depending on the relative relevance of thermal forcing and wall shear. In this paper we report…
Flow organization in laterally unconfined Rayleigh-Bénard turbulence
Alexander Blass, Roberto Verzicco, Detlef Lohse +2
We investigate the large-scale circulation (LSC) of turbulent Rayleigh-Bénard convection in a large box of aspect ratio for Rayleigh numbers up to and at a fixed P…
From Rayleigh-Bénard convection to porous-media convection: how porosity affects heat transfer and flow structure
Shuang Liu, Linfeng Jiang, Kai Leong Chong +6
We perform a numerical study of the heat transfer and flow structure of Rayleigh-Bénard (RB) convection in (in most cases regular) porous media, which are comprised of circular, so…
Towards DNS of the Ultimate Regime of Rayleigh--Bénard Convection
Richard J. A. M. Stevens, Detlef Lohse, Roberto Verzicco
In this contribution we have briefly introduced the problem of turbulent thermal convection with a particular look at its transition to the ultimate regime and the resolution requi…
From zonal flow to convection rolls in Rayleigh-Bénard convection with free-slip plates
Qi Wang, Kai Leong Chong, Richard J. A. M. Stevens +2
Rayleigh-Bénard (RB) convection with free-slip plates and horizontally periodic boundary conditions is investigated using direct numerical simulations. Two configurations are consi…
What rotation rate maximizes heat transport in rotating Rayleigh-Bénard convection with Prandtl number larger than one?
Yantao Yang, Roberto Verzicco, Detlef Lohse +1
The heat transfer and flow structure in rotating Rayleigh-Bénard convection are strongly influenced by the Rayleigh (), Prandtl (), and Rossby () number. For $Pr\gtrsim…
Calculation of the mean velocity profile for strongly turbulent Taylor--Couette flow and arbitrary radius ratios
Pieter Berghout, Roberto Verzicco, Richard J. A. M. Stevens +2
Taylor--Couette (TC) flow is the shear-driven flow between two coaxial independently rotating cylinders. In recent years, high-fidelity simulations and experiments revealed the sha…
Interaction between low-level jets and wind farms in a stable atmospheric boundary layer
Srinidhi Nagarada Gadde, Richard J. A. M. Stevens
Low-level jets (LLJs) are the wind maxima in the lower regions of the atmosphere with a high wind energy potential. Here we use large-eddy simulations to study the effect of LLJ he…
Reply to "Absence of Evidence for the Ultimate Regime in Two-Dimensional Rayleigh-Bénard Convection"
Xiaojue Zhu, Varghese Mathai, Richard J. A. M. Stevens +2
Rely to the comment by Doering et al. in Phys. Rev. Lett. 123, 259401 (2019)