Marco De Paoli

Marco De Paoli
University of Twente | UT · Physics of Fluids Group

Doctor of Philosophy

About

47
Publications
4,407
Reads
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237
Citations
Introduction
Marco De Paoli currently works at the Institute of Fluid Mechanics and Heat Transfer, TU Wien. Marco does research in Fluid Mechanics.
Additional affiliations
September 2017 - August 2020
TU Wien
Position
  • University Assistant
Description
  • Lab of multiphase flows
April 2017 - present
TU Wien
Position
  • University Assistant
Education
March 2016 - November 2016
TU Wien
Field of study
  • Institute of Fluid Mechanics and Heat Transfer
January 2014 - December 2016
University of Udine
Field of study
  • Environmental and Energy Engineering Science
March 2013 - June 2013

Publications

Publications (47)
Article
Full-text available
We perform large-scale numerical simulations to study Rayleigh–Darcy convection in three-dimensional fluid-saturated porous media up to Rayleigh–Darcy number $Ra=8\times 10^4$ . At these large values of $Ra$ , the flow is dominated by large columnar structures – called megaplumes – which span the entire height of the domain. Near the boundaries, th...
Preprint
Full-text available
We assess experimentally the scaling laws that characterize the mixing region produced by the Rayleigh-Taylor instability in a confined porous medium. In particular, we aim at verifying the existence of a superlinear scaling for the growth of the mixing region, as was observed in recent two-dimensional simulations. To this purpose, we use a Hele-Sh...
Presentation
Full-text available
Three-dimensional Rayleigh-Darcy convection at high Rayleigh numbers
Presentation
Full-text available
Influence of the reservoir properties on the dynamics of a migrating current of carbon dioxide
Presentation
Full-text available
Three-dimensional Rayleigh-Darcy convection at high Rayleigh numbers
Article
Full-text available
We investigate experimentally the dynamics of non-axisymmetric fibres in channel flow turbulence, focusing specifically on the importance of the fibre size relative to the flow scales. To this aim, we maintain the same physical size of the fibres and we increase the shear Reynolds number. Experiments are performed in the TU Wien Turbulent Water Cha...
Article
After the Spanish flu pandemic, it was apparent that airborne transmission was crucial to spreading virus contagion, and research responded by producing several fundamental works like the experiments of Duguid [J. P. Duguid, J. Hyg. 44, 6 (1946)] and the model of Wells [W. F. Wells, Am. J. Hyg. 20, 611–618 (1934)]. These seminal works have been pil...
Article
Full-text available
In this work, we investigate the dynamics of long non-axisymmetric fibres in turbulent channel flow. The experimental facility is the TU Wien Turbulent Water Channel, consisting of a closed water channel (aspect ratio of 10), and the experiments are performed at a shear Reynolds number of 360. Fibres are neutrally buoyant rods that are curved and c...
Preprint
Full-text available
After the Spanish flu pandemic, it was apparent that airborne transmission was crucial to spreading virus contagion, and research responded by producing several fundamental works like the experiments of Duguid [J. Hyg. 44:6, 1946] and the model of Wells [Am. J. Hyg., 20:611–18,1934]. These seminal works have been pillars to past and current guideli...
Article
Full-text available
Storage of carbon dioxide (CO2) in saline aquifers is a promising tool to stabilize the anthropogenic CO2 emissions. At the reservoir conditions, injected CO2 is buoyant with respect to the ambient fluid (brine) and spreads as a current laterally and toward the top cap rock of the aquifer, with the potential risk of a leakage into the upper aquifer...
Data
This movie is showing the process of Concentration- based Velocity Reconstruction depicted in Fig.10 of the paper: https://link.springer.com/article/10.1007/s00348-020-03016-3
Article
Full-text available
We examine the process of convective dissolution in a Hele-Shaw cell. We consider a one-sided configuration and we propose a newly developed method to reconstruct the velocity field from concentration measurements. The great advantage of this Concentration-based Velocity Reconstruction (CVR) method consists of providing both concentration and velo...
Article
Full-text available
How non-Darcy effects influence scaling laws in Hele-Shaw convection experiments - Volume 892 - Marco De Paoli, Mobin Alipour, Alfredo Soldati
Data
Time-dependent evolution of a system characterized by Rayleigh-Darcy number Ra0 = 12023 and amplitude of the initial perturbation O(ε) = 10−5. (a) Concentration distribution with explicit indication of the finger extension (mixing length, red dashed lines). (b) Horizontally-averaged concentration profile. (c) Time dependent evolution of M(t).
Data
Time-dependent evolution of a system characterized by Rayleigh-Darcy number Ra0 = 12023 and amplitude of the initial perturbation O(ε) = 10−5. (a) Scalar dissipation rate distribution. (b) Horizontally-averaged scalar dissipation rate profile. (c) Time-dependent evolution of ⟨χ(t)⟩.
Data
Time-dependent evolution of a system characterized by Rayleigh-Darcy number Ra0 = 12023 and amplitude of the initial perturbation O(ε) = 10−5. (a) Scalar dissipation rate distribution. (b) Power spectrum computed along the centerline. (c) Time-dependent evolution of mean wavenumber.
Article
Full-text available
We study the problem of fluid mixing induced by gravity-driven Rayleigh-Taylor convective dissolution in porous media with top and bottom confinement. The competition between buoyancy and diffusion is measured by the Rayleigh-Darcy number, Ra0, the value of which controls the entire dynamics of the flow. In this work, mixing is quantified by the me...
Article
Full-text available
The process of solutal convection in porous media is here studied experimentally in a Hele‐Shaw cell. Motivated by the carbon sequestration process, potassium permanganate and water are used to mimic the dissolution of carbon dioxide in brine in underground geological formations. An optical method is used to accurately reconstruct the solute concen...
Article
Numerical simulations are used here to analyze the Rayleigh-Taylor instability in confined and isotropic porous media. The Rayleigh-Taylor instability phenomena arise when a layer of heavy fluid sits on top of a layer of a lighter fluid. Small fluctuations of the interface separating the two fluid layers produce larger structures that eventually dr...
Preprint
Full-text available
Numerical simulations are used here to analyze the Rayleigh-Taylor (RT) instability in confined and isotropic porous media. The Rayleigh-Taylor instability phenomena arise when a layer of heavy fluid sits on top of a layer of a lighter fluid. Small fluctuations of the interface separating the two fluid layers produce larger structures that eventual...
Article
In this work, we examine the influence of viscosity on breakup and coalescence of a swarm of large drops in a wall-bounded turbulent flow. We consider several values of surface tension and a wide range of drops to fluid viscosity ratios λ=ηd/ηc (with ηd the viscosity of the drops and ηc the viscosity of the carrier fluid), from λ=0.01 to λ=100, whi...
Thesis
Convection in porous media occurs in a number of industrial and geological applications, and has important fundamental features related to the physics of buoyancy drive flows. In recent years, this phenomenon has received renovated attention for the implications it can bear in carbon dioxide sequestration strategies. In this work convective flows...
Article
Full-text available
In the present study, we use direct numerical simulations to examine the role of non-isotropic permeability on solutal convection in a fluid-saturated porous medium. The dense solute injected from the top boundary is driven downwards by gravity and follows a complex time-dependent dynamics. The process of solute dissolution, which is initially cont...
Poster
Full-text available
We consider a buoyancy-driven flow in a fluid-satured porous layer. Space-time measurements of the concentration field are used to characterize the flow topology.
Poster
Full-text available
Reduction of greenhouse effect: prediction of CO2 dissolution in geological reservoirs
Article
Full-text available
Solute convection in porous media at high Rayleigh-Darcy numbers has important fundamental features and may also bear implications for geological CO2 sequestration processes. With the aid of direct numerical simulations, we examine the role of anisotropic permeability on the distribution of solutal concentration in fluid saturated porous medium. Ou...
Thesis
Full-text available
The evaluation of particle concentration in wall-bounded turbulence is a problem of many implications for a variety of industrial and environmental applications. This problem cannot be tackled using a numerical approach based on Direct Numerical Simulation (DNS), which would require excessive computational costs to match flow Reynolds number and ge...

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Projects

Projects (3)
Project
Anisotropic particles in turbulent channel flows: experiments
Project
Numerical investigation of convection in porous media in different flow configurations (Rayleigh-Benard, Rayleigh-Taylor, ...)
Project
Investigation of convection in Hele-Shaw flows and development of new methods