CFD Modelling and Simulation
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Mapping flagellated swimmers to surface-slip driven swimmers.
Gidituri, H.
; Kabacaoglu, G.; Ellero, M.; Balboa, F. (2023)
Flagellated microswimmers are ubiquitous in natural habitats. Understanding the hydrodynamic behavior of these cells is of paramount interest, owing to their applications in bio-medical engineering and disease spreading. ... -
Swimming Efficiently by Wrapping
Ellero, M.; Balboa, F.; Gidituri, H. (2023)
Single flagellated bacteria are ubiquitous in nature. They exhibit various swimming modes using their flagella to explore complex surroundings such as soil and porous polymer networks. Some single-flagellated bacteria ... -
A simple catch: Fluctuations enable hydrodynamic trapping of microrollers by obstacles
van der Wee, E. B.; Blackwell, B. C.; Sokolov, A.; Balboa, F.; Katz, I. T.; Delmotte, B.; Driscoll, M. M. (2023-03-10)
It is known that obstacles can hydrodynamically trap bacteria and synthetic microswimmers in orbits, where the trapping time heavily depends on the swimmer flow field and noise is needed to escape the trap. Here, we use ... -
Computational modeling of passive transport of functionalized nanoparticles
Moreno-Chaparro, D.; Moreno, N.; Balboa, F.; Ellero, M. (2023-03-14)
Functionalized nanoparticles (NPs) are complex objects present in a variety of systems ranging from synthetic grafted nanoparticles to viruses. The morphology and number of the decorating groups can vary widely between ... -
Shape matters: Competing mechanisms of particle shape segregation
(2022)It is well-known that granular mixtures that differ in size or shape segregate when sheared. In the past, two mechanisms have been proposed to describe this effect, and it is unclear if both exist. To settle this question, ... -
Computational Mesoscale Framework for Biological Clustering and Fractal Aggregation
Zohravi, E.; Moreno, N.; Ellero, M. (2023-09-11)
Hierarchical clustering due to diffusion and reaction is a widespread occurrence in natural phenomena, displaying fractal behavior with non-integer size scaling. The study of this phenomenon has garnered interest in both ... -
Numerical simulations of thixotropic semi-solid aluminium alloys in open-rotor and rotor-stator mixers
Garcia, I.; Figueroa-Landeta, M.; López-Aguilar, J. E.; Garcia de Cortazar, M.; Girot, F.; Ellero, M. (2023-09-21)
This research uses the Bautista-Manero-Puig (BMP) model to examine flow patterns of semi-solid aluminium alloys (Al) in open-rotor and stator-rotor mixers via numerical solutions. The model captures the distinct ... -
On building physics-based AI models for the design and SHM of mooring systems
Nava, V.; Aristondo, A.; Varo, V.; Esteras, M.; Touzon, I.; Boto, F.; Mendikoa, I.; Ruiz-Minguela, P.; Gil-Lopez, S.; Gorostidi, N.; Pardo, D. (2023-01-01)
Expert systems in industrial processes are modelled using physics-based approaches, data-driven models or hybrid approaches in which however the underlying physical models generally constitute a separate block with respect ... -
Faulty wind farm simulation: An estimation/control-oriented model
Peña-Sanchez, Y.; Penalba, M.; Nava, V. (2023-01-01)
A large percentage of the electricity generation cost of wind turbines (WTs) is related to the operation and maintenance of the WTs. To reduce such costs, fault detection and isolation (FDI) and fault tolerant control (FTC) ... -
The role of the particle aspect ratio in the discharge of a narrow silo
(2022-10-01)The time evolution of silo discharge is investigated for different granular materials made of spherical or elongated grains in laboratory experiments and with discrete element model (DEM) calculations. For spherical grains, ... -
The complex viscosity of Möbius macromolecules
Piette, J. H.; Moreno, N.; Fried, E.; Giacomin, A. J. (2020-09-01)
Using general rigid bead-rod theory, we explore the effect of twisting a macromolecule on its rheological properties in suspensions. We thus focus on macromolecules having the form of Möbius bands so that the number of ... -
Tribological variable-friction coefficient models for the simulation of dense suspensions of rough polydisperse particles
Ruiz-Lopez, J.A.; Prasanna Kumar, S. S.; Vazquez-Quesada, A.; De Vicente, J.; Ellero, M. (2023-03-01)
The rheology of concentrated suspensions of particles is complex and typically exhibits a shear-thickening behavior in the case of repulsive interactions. Despite the recent interest arisen, the causes of the shear-thickening ... -
Non-affine motion and selection of slip coefficient in constitutive modeling of polymeric solutions using a mixed derivative
Nieto, D.; Español, P.; Ellero, M. (2023-01-01)
Constitutive models for the dynamics of polymer solutions traditionally rely on closure relations for the extra stress or related microstructural variables (e.g., conformation tensor) linking them to flow history. In this ... -
SPH simulations of thixo-viscoplastic fluid flow past a cylinder
Rossi, E.; Garcia de Beristain, I.; Vazquez-Quesada, A.; López-Aguilar, J. E.; Ellero, M. (2022-10-01)
Thixotropic materials are complex fluids that display time-dependent viscosity and/or yield-stress response upon the application of a fixed deformation, while recovering their original structured-state when the deformation ... -
Mesoscopic simulations of inertial drag enhancement and polymer migration in viscoelastic solutions flowing around a confined array of cylinders
Nieto, D.; Ellero, M. (2022-07-01)
We study the flow around a periodic array of cylinders using a mesoscopic viscoelastic fluid that mimics polymeric solutions. We model our fluid employing a novel mesoscopic method based on Smoothed Dissipative Particle ... -
Limited Visual Range in the Social Force Model: Effects on Macroscopic and Microscopic Dynamics
García, A.; Hernández-Delfin, D.; Lee, D.J.; Ellero, M. (2023-01-15)
The Social Force Model has been widely used to simulate pedestrian dynamics. Its simplicity and ability to reproduce some collective patterns of behavior make it an adequate tool in the field of pedestrian dynamics. However, ... -
A numerical method for suspensions of articulated bodies in viscous flows
Balboa, F.; Delmotte, B. (2022-09-01)
An articulated body is defined as a finite number of rigid bodies connected by a set of arbitrary constraints that limit the relative motion between pairs of bodies. Such a general definition encompasses a wide variety of ... -
Technology-Agnostic Assessment of Wave Energy System Capabilities
Ruiz‐minguela, P.; Blanco, J.M.; Nava, V.; Jeffrey, H.F. (2022-04-01)
Developing new wave energy technologies is risky, costly and time-consuming. The large diversity of concepts, components and evaluation criteria creates a vast design space of potentially feasible solutions. This paper ... -
Experimental investigation of anomalous molecular probe diffusion in entangled polymer melts
Nieto, D.; Ramakrishnan, V.; Smoukov, S. K.; Venerus, D. C. (2022-01-01)
Investigations on the diffusion of small molecules or particles in polymeric materials are important to numerous technologies and can also be used to gain insight on polymer chain dynamics. Systems where the probe size is ... -
Mesoscopic simulations of inertial drag enhancement and polymer migration in viscoelastic solutions flowing around a confined array of cylinders
Nieto, D.; Ellero, M. (2022-07-01)
We study the flow around a periodic array of cylinders using a mesoscopic viscoelastic fluid that mimics polymeric solutions. We model our fluid employing a novel mesoscopic method based on Smoothed Dissipative Particle ...
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