Dirk Lucas
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View article: Lagrangian tracking reveals competing influences of clustering and turbulence on the rise velocity of bubble swarms
Lagrangian tracking reveals competing influences of clustering and turbulence on the rise velocity of bubble swarms Open
The rise velocity of bubble swarms is a fundamental property in many natural and industrial flows. A central question is whether clustering of bubbles enhances or suppresses their rise velocity compared to isolated single bubbles in quiesc…
View article: Improving Precast Building Work Efficiency Through Building Information Modeling
Improving Precast Building Work Efficiency Through Building Information Modeling Open
This study investigates the application of 3D and 4D Building Information Modelling (BIM) to improve the efficiency of precast building design and project management. Traditional precast workflows are complex and poorly defined, leading to…
View article: Some aspects on CFD modelling of a homogeneous bubble column regarding the effects of surfactants
Some aspects on CFD modelling of a homogeneous bubble column regarding the effects of surfactants Open
View article: Correction to: A contribution to 3D tracking of deformable bubbles in swarms using temporal information
Correction to: A contribution to 3D tracking of deformable bubbles in swarms using temporal information Open
View article: Numerical methods for multiphase flows
Numerical methods for multiphase flows Open
View article: A contribution to 3D tracking of deformable bubbles in swarms using temporal information
A contribution to 3D tracking of deformable bubbles in swarms using temporal information Open
Reliable Lagrangian 3D tracking of individual bubble swarm members allows a deeper understanding of hydrodynamic bubble–bubble interactions and their collective rise. For multi-view measurements, we have recently developed such a tracking …
View article: A contribution to 3D tracking of deformable bubbles in swarms using temporal information
A contribution to 3D tracking of deformable bubbles in swarms using temporal information Open
Reliable Lagrangian 3D tracking of individual bubble swarm members allows a deeper understanding of hydrodynamic bubble-bubble interactions and their collective rise. For multi-view measurements, we have recently developed such a tracking …
View article: 3D detection and tracking of deformable bubbles in swarms with the aid of deep learning models
3D detection and tracking of deformable bubbles in swarms with the aid of deep learning models Open
A 3D tracking of individual bubbles in bubble swarms is essential for revealing and understanding bubble interactions and clustering mechanisms in bubbly flows. In this work, we address this issue and present a new method for tracking defo…
View article: Revisiting RANS turbulence modelling for bubble-induced turbulence: Effects of surfactants
Revisiting RANS turbulence modelling for bubble-induced turbulence: Effects of surfactants Open
Recent experiments of dispersed bubbly flow (Ma et al., 2023) show that contamination of the carrier phase plays a considerable role in bubble-induced turbulence (BIT): although the bubbles rise slower with adding surfactants, the BIT incr…
View article: Value Creation And Stability In Financial Services: How Should We Regulate Banks?
Value Creation And Stability In Financial Services: How Should We Regulate Banks? Open
View article: 3d Detection and Tracking of Deformable Bubbles in Swarms with the Aid of Deep Learning Models
3d Detection and Tracking of Deformable Bubbles in Swarms with the Aid of Deep Learning Models Open
View article: Ai-Enhanced Drug Discovery: Applying Machine Learning to Accelerate The Drug Discovery Process
Ai-Enhanced Drug Discovery: Applying Machine Learning to Accelerate The Drug Discovery Process Open
View article: Fate of bubble clusters rising in a quiescent liquid
Fate of bubble clusters rising in a quiescent liquid Open
We use experiments to study the evolution of bubble clusters in a swarm of freely rising, deformable bubbles. A new machine learning-aided algorithm allows us to identify and track bubbles in clusters and measure the cluster lifetimes. The…
View article: Simulation of droplet entrainment in annular flow with a morphology adaptive multifield two-fluid model
Simulation of droplet entrainment in annular flow with a morphology adaptive multifield two-fluid model Open
Modeling of annular flow with the computational fluid dynamics (CFD) is challenging as one has to consider several, rather different, phenomena simultaneously: the continuous liquid film, continuous gas core, and dispersed droplets. A morp…
View article: Effects of surfactants on bubble-induced turbulence
Effects of surfactants on bubble-induced turbulence Open
We use experiments to explore the effect of surfactants on bubble-induced turbulence (BIT) at different scales, considering how the bubbles affect the flow kinetic energy, anisotropy and extreme events. To this end, high-resolution particl…
View article: Numerical Simulation of Flashing Flows in a Converging–Diverging Nozzle with Interfacial Area Transport Equation
Numerical Simulation of Flashing Flows in a Converging–Diverging Nozzle with Interfacial Area Transport Equation Open
Flashing flows of initially sub-cooled water in a converging–diverging nozzle is investigated numerically in the framework of the two-fluid model (TFM). The thermal non-equilibrium effect of phase change is considered by an interfacial hea…
View article: A Note on Modeling the Effects of Surfactants on Bubble‐Induced Turbulence
A Note on Modeling the Effects of Surfactants on Bubble‐Induced Turbulence Open
Recent experimental results reveal that with rising concentration of surfactants, the generated bubble‐induced turbulence (BIT) increases as well, although the bubbles rise slower. Herein, it is shown that this phenomenon has not be consid…
View article: CFD Modeling of Phase Change during the Flashing-Induced Instability in a Natural Circulation Circuit
CFD Modeling of Phase Change during the Flashing-Induced Instability in a Natural Circulation Circuit Open
Flashing-induced instability (FII) has a significant impact on the safe operation of a natural circulation circuit, a phenomenon frequently encountered in the cooling systems of advanced light water reactors. While one-dimensional system c…
View article: Message from the Guest Editor of the 18th Multiphase Flow Conference Special Issue
Message from the Guest Editor of the 18th Multiphase Flow Conference Special Issue Open
View article: Euler-Euler CFD simulation of high velocity gas injection at pool scrubbing conditions
Euler-Euler CFD simulation of high velocity gas injection at pool scrubbing conditions Open
Pressure relief by blowdown is one of the most important measures to prevent excessive pressures in the primary circuit or containment in severe nuclear accidents. Pool scrubbing can significantly reduce the release of radioactive material…
View article: Sustainable development of simulation setups and addons for OpenFOAM for nuclear reactor safety research
Sustainable development of simulation setups and addons for OpenFOAM for nuclear reactor safety research Open
Open-source environments such as the Computational Fluid Dynamics software OpenFOAM are very appealing for research groups since they allow for an efficient prototyping of new models or concepts. However, for downstream developments to be …
View article: Direct numerical simulation of heat transfer on a deformable vapor bubble rising in superheated liquid
Direct numerical simulation of heat transfer on a deformable vapor bubble rising in superheated liquid Open
Heat transfer on a vapor bubble rising in superheated liquid is investigated by direct numerical simulation. The vapor–liquid system is described by the one-fluid formulation with the level set method capturing the interface. The proportio…
View article: Effects of surfactants on bubble-induced turbulence
Effects of surfactants on bubble-induced turbulence Open
We use experiments to explore the effect of surfactants on bubble-induced turbulence (BIT) at different scales, considering how the bubbles affect the flow kinetic energy, anisotropy and extreme events. To this end, high-resolution Particl…
View article: Development of machine learning framework for interface force closures based on bubble tracking data
Development of machine learning framework for interface force closures based on bubble tracking data Open
View article: DNS and Highly-Resolved LES of Heat and Mass Transfer in Two-Phase Counter-Current Condensing Flow
DNS and Highly-Resolved LES of Heat and Mass Transfer in Two-Phase Counter-Current Condensing Flow Open
A comprehensive study of direct-contact condensation heat transfer for turbulent, counter-current, liquid/vapour flow in a nearly horizontal channel at high pressure (i.e. 5 MPa) has been carried out based on Direct Numerical Simulation (D…
View article: A particle-center-averaged Euler-Euler model for monodisperse bubbly flows
A particle-center-averaged Euler-Euler model for monodisperse bubbly flows Open
View article: Numerical modeling of horizontal stratified two-phase flows using the AIAD model
Numerical modeling of horizontal stratified two-phase flows using the AIAD model Open
In nuclear reactor safety research, the countercurrent gas-liquid two-phase flow in the hot leg of a pressurized water reactor (PWR) has attracted considerable attention. Previous work has proven that the algebraic interfacial area density…
View article: An experimental study on the multiscale properties of turbulence in bubble-laden flows
An experimental study on the multiscale properties of turbulence in bubble-laden flows Open
The properties of bubble-laden turbulent flows at different scales are investigated experimentally, focusing on the flow kinetic energy, energy transfer and extreme events. The experiments employed particle shadow velocimetry measurements …
View article: Bubble identification from images with machine learning methods
Bubble identification from images with machine learning methods Open
An automated and reliable processing of bubbly flow images is highly needed to analyse large data sets of comprehensive experimental series. A particular difficulty arises due to overlapping bubble projections in recorded images, which hig…
View article: A CFD Approach for the Flow Regime Transition in a Vane-Type Gas-Liquid Separator
A CFD Approach for the Flow Regime Transition in a Vane-Type Gas-Liquid Separator Open