244 citations · 4.7k across the 124 of their papers we have counts for
20 papers · 1 filter
Regime transitions in thermally driven high-Rayleigh number vertical convection
Qi Wang, Hao-Ran Liu, Roberto Verzicco +2
Vertical convection is investigated using direct numerical simulations over a wide range of Rayleigh numbers with fixed Prandtl number , in a two-dime…
Growth of respiratory droplets in cold and humid air
Chong Shen Ng, Kai Leong Chong, Rui Yang +3
The ambient conditions surrounding liquid droplets determine their growth or shrinkage. However, the precise fate of a liquid droplet expelled from a respiratory puff as dictated b…
Extended lifetime of respiratory droplets in a turbulent vapour puff and its implications on airborne disease transmission
Kai Leong Chong, Chong Shen Ng, Naoki Hori +3
To quantify the fate of respiratory droplets under different ambient relative humidities, direct numerical simulations of a typical respiratory event are performed. We found that,…
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…
Instabilities driven by diffusio-phoretic flow on catalytic surfaces
Yibo Chen, Kai Leong Chong, Luoqin Liu +2
We theoretically and numerically investigate the instabilities driven by diffusiophoretic flow, caused by a solutal concentration gradient along a reacting surface. The important c…
A finite-difference scheme for three-dimensional incompressible flows in spherical coordinates
L. Santelli, P. Orlandi, R. Verzicco
In this study we have developed a flexible and efficient numerical scheme for the simulation of three-dimensional incompressible flows in spherical coordinates. The main idea, insp…
A fully Eulerian solver for the simulation of multiphase flows with solid bodies: application to surface gravity waves
Francesco De Vita, Filippo De Lillo, Roberto Verzicco +1
In this paper a fully Eulerian solver for the study of multiphase flows for simulating the propagation of surface gravity waves over submerged bodies is presented. We solve the inc…
Double maxima of angular momentum transport in TC turbulence
Rodrigo Ezeta, Francesco Sacco, Dennis Bakhuis +5
We use experiments and direct numerical simulations to probe the phase-space of low-curvature Taylor--Couette (TC) flow in the vicinity of the ultimate regime. The cylinder radius…
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…
Multiple states in turbulent large-aspect ratio thermal convection: What determines the number of convection rolls?
Qi Wang, Roberto Verzicco, Detlef Lohse +1
Recent findings suggest that wall-bounded turbulent flow can take different statistically stationary turbulent states, with different transport properties, even for the very same v…
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…
Two-layer Thermally Driven Turbulence: Mechanisms for Interface Breakup
Hao-Ran Liu, Kai Leong Chong, Qi Wang +3
It is commonly accepted that the breakup criteria of drops or bubbles in turbulence is governed by surface tension and inertia. However, also {\it{buoyancy}} can play an important…
Periodically modulated thermal convection
Rui Yang, Kai Leong Chong, Qi Wang +3
Many natural and industrial turbulent flows are subjected to time-dependent boundary conditions. Despite being ubiquitous, the influence of temporal modulations (with frequency …
Café Latte: Spontaneous layer formation in laterally cooled double diffusive convection
K. L. Chong, R. Yang, Q. Wang +2
In the preparation of Café Latte, spectacular layer formation can occur between the expresso shot in a glass of milk and the milk itself. Xue et al. (Nat. Commun., vol. 8, 2017, pp…
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…
Subcritical behaviour in double diffusive convection within the diffusive regime
Kai Leong Chong, Rui Yang, Yantao Yang +2
We conduct two- and three-dimensional simulations for double diffusive convection in the diffusive regime, where the fluid flow is driven by a destabilizing temperature gradient an…
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…
Diffusive interaction of multiple surface nanobubbles and nanodroplets: shrinkage, growth, and coarsening
Xiaojue Zhu, Roberto Verzicco, Xuehua Zhang +1
Surface nanobubbles are nanoscopic spherical-cap shaped gaseous domains on immersed substrates which are stable, even for days. After the stability of a {\it single} surface nanobu…