Papers by Aldo Tamburrino
E3S web of conferences, Dec 31, 2022
During 29-31 January 2021 (austral summer), an extreme storm event triggered catastrophic debris ... more During 29-31 January 2021 (austral summer), an extreme storm event triggered catastrophic debris flows in central Chile (33-36°S). At small and precarious rural settlements in the commune of Malloa in central Chile, debris flows where triggered by a hailstorm. Hail-debris flows, with hail volume concentration near 10%-20%, caused 200 injured individuals and 73 damaged houses. In this study, haildebris flows where modelled using the FLO2D. software, calibrated against flow velocities and flooded areas obtained from audiovisual records taken by local inhabitants (using cell phones) and a high-accuracy post-event topography obtained with a drone. Results suggest that hail content significantly reduces flow resistance compared to typical debris flows, thus increasing flow velocity, and run out. On the other hand, damage to infrastructure was more related to the materiality of the houses (precarious settlements) than to debris flow severity.
Mathematics, Jan 25, 2024
This article investigates the velocity field of a free-surface flow subjected to harmonic deforma... more This article investigates the velocity field of a free-surface flow subjected to harmonic deformation of the channel bottom, progressing asymptotically from a flat initial state to a maximum amplitude. Assuming a uniform main flow with the primary velocity component transverse to the bed undulation, analytical solutions are obtained for the three velocity components and free surface distortion using the method of perturbations. The perturbation components of the velocity field, streamlines, and surface deformation depend on a dimensionless parameter that reflects the fluid inertia induced by bed deformation relative to viscous resistance. When viscous effects dominate, a monotonic decay of the perturbations from the bed to the free surface is observed. In contrast, when inertia dominates, the perturbations can exhibit an oscillatory behavior and introduce circulation cells in the plane normal to the main flow. The interplay between inertia and viscosity reveals scenarios where surface and bed deformations are either in or out of phase, influencing vertical velocity components. Figures illustrate these phenomena, providing insights into the complex dynamics of free-surface flows with harmonic bed deformation in the direction normal to the main flow, and amplitude growing with time. The results are limited to small deformations of the channel bottom, as imposed by the linearization of the momentum equations. Even so, to the best of the authors' knowledge, this problem has not been addressed before.
The relative effect of ambient fluid and initial density in the mobility of fine granular flows
AGUFM, Dec 1, 2016
Paste ..., 2009
The present tendency of the mining industry to design and evolve their production systems to mini... more The present tendency of the mining industry to design and evolve their production systems to minimise the use of water has resulted in the need for an assessment of efficient paste and thickened tailings disposal sites. This paper proposes a dimensionless variable and a length model for slow laminar Bingham flows. Results converge to previous scalings at the limit of Newtonian fluid. Reasonable agreement with field data reported in the previous edition of the present conference was found.
Development of the kinematic model to rapidly simulate the flow of caved rock for block caving
In recent years, new efforts have been made into the investigation of gravity flow of caved rock ... more In recent years, new efforts have been made into the investigation of gravity flow of caved rock for block caving methods using different research approaches. These include physical modelling, numerical modelling and full scale tests. One of the practical aims of studying the flow characteristics of the caved rock is to evaluate ore recovery, dilution and mixing resulting from given draw control and production level design practices. To date, the main tool used to predict mixing and recovery for mine long-term planning purposes in block caves is the volumetric model or template mixing approaches. From the various emergent numerical approaches to simulate the flow of the caved rock, the kinematic model (KM) has been proposed to describe the granular flow in silos and bins. In this paper we developed an improved kinematic model (IKM) and used it to replicate the flow for block caving using several drawpoints. The mixing which is generated from the flow was validated using data coming from an extensive experimental work. Results indicate that the calibrated model could simulate the flow using the kinematic approach in both isolated and multiple draw conditions.
Segregation effects on flow’s mobility and final morphology of axisymmetric granular collapses
Granular Matter, Aug 30, 2022
calculated from the data collected. kinetic energy distribution. Velocity spectra and autocorrela... more calculated from the data collected. kinetic energy distribution. Velocity spectra and autocorrelations were also velocity fields, mean velocity profiles, turbulence intensities and turbulent Flow visualization and PIV techniques were used to compute instantaneous region of a tank agitated by jets located in the bottom are presented in the paper. Results of an experimental study about the flow structure in the near free surface phenomenon, which is important in the gas transfer process across the interface. upwelling of fluid. It is postulated that these events are associated to the renewal most relevant event corresponds to a horizontal sweep, usually preceded by an periodical pattern, was inferred from flow visualization and measurements. The A succession of events in the near air-water interface, forming a quasiones. horizontal size and diminishing the vertical one, or breaking down in smaller vortices deform when they approach to the free surface, increasing their vertical velocity fluctuation was inferred from the velocity spectra. Ascending associated to large scale motions in the tank. Isotropy loss and damping of the Velocity spectra and autocorrelations showd some dominant frequencies 1 Introduction and objectives the air-water interface is essential to predict concentration levels or distribution interface. In particular, a better knowledge of the gas transfer mechanism across important role in the mass and heat transfer mechanism across the air-water Phenomena occurring at and near the free surface of turbulent flows play an
Experimental Study Of The Flow Structure In The Near Free-surface Region
WIT transactions on engineering sciences, May 28, 2002
Free-surface turbulence measurements in an open-channel flow
Free-surface turbulence measurements in an open-channel flow. Aldo Tamburrino, John S Gulliver Fr... more Free-surface turbulence measurements in an open-channel flow. Aldo Tamburrino, John S Gulliver Free-surface turbulence, 103-112, 1994. Velocity measurements near a free surface are complicated by limitations on probe resolution and fluctuations of the free surface itself. ...
Stochastic approach to free-surface turbulence
Stochastic Hydraulics 2000, 2020
World Congress on Mechanical, Chemical, and Material Engineering, 2017
Preliminary results of an experimental study on the incipient motion of granular, non-cohesive pa... more Preliminary results of an experimental study on the incipient motion of granular, non-cohesive particles in a laminar oscillatory flow of water and power law fluids are presented in this paper. The threshold condition is defined in terms of two dimensionless variables, one () representing the ratio between Coulombic and drag forces acting on the particles, and another () that involves the quotient of the particle diameter and a scale of the boundary layer thickness, a modified Reynolds number of the particle, and a function of the flow behaviour index of the fluid. A relation between and was obtained that shows good agreement with the experimental data.
Reservoir sedimentation
River Flow 2006, 2006
Engineering Applications of Computational Fluid Mechanics, 2018
Numerical modeling of pile scour is performed due to the action of unsteady currents and oscillat... more Numerical modeling of pile scour is performed due to the action of unsteady currents and oscillatory flow greens, using 3D Reynolds averaged Navier-Stokes (RANS) equations for the hydrodynamic description and the Exner equation for the morphological evolution of the bed, all of them incorporated into the computational fluid dynamics tool called REEF3D. As a first task, the numerical model was calibrated by comparing its results of scour against two sets of data, the first one obtained from numerical simulations and the second one from experimental tests. From these results it was possible to define the closure model of turbulence and a relaxation coefficient on the bed load equation necessary to increase the mobility of the sediments in the vicinity of the pile. Once the model was calibrated, a set of numerical simulations of pile scour under unsteady flow and oscillatory flow was performed using different hydrographs and wave conditions. There is a strong agreement between the simulated data and the experimental data reported by other authors for unsteady flow. In the case of scour associated with oscillatory flow, the numerical results showed the same statistical behavior as the experimental data previously published by others. When the numerical results are analyzed according to the Keulegan-Carpenter number, they represent the scour phenomenon in the same order of magnitude of the experiments. A conclusion of the study is the necessity to improve the sediment transport description, in order to avoid the use of a dedicated relaxation coefficient that reduces the threshold condition of the incipient transport.
Mechanics Research Communications, 1997
The evolution of the major achievements in water lifting devices with emphasis on the major techn... more The evolution of the major achievements in water lifting devices with emphasis on the major technologies over the centuries is presented and discussed. Valuable insights into ancient water lifting technologies with their apparent characteristics of durability, adaptability, and sustainability are provided. A comparison of the relevant technological developments in several early civilizations is carried out. These technologies are the underpinning of modern achievements in water engineering. They represent the best paradigm of probing the past and facing the future. A timeline of the historical development
Superhydrophobic SLA 3D printed materials modified with nanoparticles biomimicking the hierarchical structure of a rice leaf
Science and Technology of Advanced Materials
In this paper, results of an experimental study aimed to determine the characteristics of bedform... more In this paper, results of an experimental study aimed to determine the characteristics of bedforms generated by non-cohesive granular particles under the action of subcritical laminar flows of pseudoplastic fluids in open channels are reported. In terms of proper dimensionless parameters, conditions for existence of bedforms are determined. Relationships among dimensionless geometric characteristics and celerity with those parameters defining the flow conditions and sediment properties are also found.
Traditionally, interactions between tributary alluvial fans and the main river have been studied ... more Traditionally, interactions between tributary alluvial fans and the main river have been studied on the field and in the laboratory, giving rise to different conceptual models that explain their role in the sediment cascade. On the other hand, numerical modeling of these complex interactions is still limited because the broad debris flow transport regimes are associated with different sediment transport models. Even though sophisticated models capable of simulating many transport mechanisms simultaneously exist, they are restricted to research purposes due to their high computational cost. In this article, we propose a workflow to model the response of the Crucecita Alta alluvial fan in the Huasco Valley, located in the Atacama Desert, Chile, during an extreme storm event. Five different deposits were identified and associated with four debris flow surges for this alluvial fan. Using a commercial software, our workflow concatenates these surges into one model. This study depicts the significance of the mechanical classification of debris flows to reproduce how an alluvial fan controls the tributary-river junction connectivity. Once our model is calibrated, we use our workflow to test if a channel is large enough to mitigate the impacts of these flows and the effects on the tributary-river junction connectivity.
Granular Matter, 2016
We report results of the run-out of experimental dam-break flows in a horizontal channel generate... more We report results of the run-out of experimental dam-break flows in a horizontal channel generated from the collapse of columns of fine (75 µm) particles fluidized at various degrees. We find that the flow run-out (x) made dimensionless by the initial column length (x o) is a power function of the initial column height-to-length ratio (r), as shown in previous works with non-fluidized flows. The run-out of flows initially fluidized at different degrees is accounted by x/x o = αr n. For initially non-fluidized flows, our values of α are significantly higher than those reported earlier for flows of coarser granular material (>0.15 mm), showing that finely grained flows have longer run-outs compared to their coarser counterparts. The coefficient α is a function of the initial degree of fluidization, with a higher growth above 93 % of fluidization, which coincides with the onset of bed expansion, and it accounts for a flow run-out increase being up to more than twice that of non-fluidized flows. The parameter α is well correlated with the amount of initial bed expansion, which undergoes a sharp transition at high degrees of fluidization that has shown to be an important B S. Montserrat
Optical Engineering, 2016
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Papers by Aldo Tamburrino