A5060442007- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Fluid Dynamics and Turbulent Flows
- Microplastics and Plastic Pollution
- Particle Dynamics in Fluid Flows
- Recycling and Waste Management Techniques
- Geophysics and Gravity Measurements
- Fluid dynamics and aerodynamics studies
- High-pressure geophysics and materials
- Nanoparticles: synthesis and applications
- Astro and Planetary Science
- Fluid Dynamics and Vibration Analysis
- Climate variability and models
- Drilling and Well Engineering
- Oceanographic and Atmospheric Processes
- Bacterial biofilms and quorum sensing
- Rheology and Fluid Dynamics Studies
- Characterization and Applications of Magnetic Nanoparticles
Universitat Politècnica de Catalunya
2024-2025
Helmholtz-Zentrum Dresden-Rossendorf
2021-2024
Brandenburg University of Technology Cottbus-Senftenberg
2022-2023
Abastumani Astrophysical Observatory
2022
University of Leeds
2022
<title>Abstract</title> This work investigates the role of shear and turbulent fluctuations on multi-species biofilm growth. The study is mostly motivated by understanding biofouling microplastics (MPs) in oceanic environments. By increasing particle stickiness, biofilms promote MP aggregation sinking; therefore, a thorough this multi-scale process crucial to improve predictions MPs fate. We conducted series laboratory experiments using an oscillating-grid system growth small plastic...
The effect of the nutation angle on flow inside a precessing cylinder is experimentally explored and compared with numerical simulations. focus laid typical breakdown directly forced m = 1 Kelvin mode for increasing precession ratio (Poincaré number) accompanying transition between laminar turbulent flows. Compared to reference case 90° angle, prograde rotation leads an earlier breakdown, while in retrograde case, continues exist also higher Poincaré numbers. Depending largely occurrence...
Abstract We numerically study precession driven flows in a cylindrical container whose nutation angle varies between 60 and 90 degrees for prograde retrograde precession. For we observe sharp transitions laminar turbulent flow state with low high geostrophic axisymmetric components related centrifugal instability, while rather smooth transition occurs. At the same time perpendicular shows an abrupt breakdown of directly excited by forcing mechanism, which is not case motion. characterize...
The properties of rotating turbulence driven by precession are studied using direct numerical simulations and analysis the underlying dynamical processes in Fourier space. study is carried out local coordinate frame, where gives rise to a background shear flow, which becomes linearly unstable breaks down into turbulence. We observe that this precession-driven general characterized coexisting two-dimensional (2D) columnar vortices three-dimensional (3D) inertial waves, whose relative energies...
Plastic particle pollution has threatened the well-being of seawater ecosystems over past decades. Therefore, understanding, modeling and (potentially) predicting dynamics microplastics biogenic particles in ocean turbulence is utmost importance to help develop mitigation strategies propose technological solutions ultimately aimed at safeguarding global water systems. This particularly significant for upper-ocean layer. To that end, this work presents a comprehensive openly accessible...
The fluid flow in a precessing cylinder is investigated numerically with focus on the Ekman boundary layers strongly forced regime. Not surprisingly, that regime, we find deviations from linear theory due to significant modifications of base terms an axisymmetric geostrophic mode whose rotation opposite container. transition bulk three-dimensional non-axisymmetric pattern reflected scaling both sidewall and top bottom cylinder. In our simulations, surpass threshold first instability (class...
We reveal and analyze an efficient magnetic dynamo action due to precession-driven hydrodynamic turbulence in the local model of a precessional flow, focusing on kinematic stage this dynamo. The growth rate field monotonically increases with Poincaré number Po, characterizing precession strength, Prandtl Pm, equal ratio viscosity resistivity, for considered ranges these parameters. critical Po_{c} onset decreases increasing Pm. To understand scale-by-scale evolution (growth) its driving...
We examine the fluid flow forced by precession of a rotating cylindrical container using numerical simulations and experimental measurements with ultrasonic Doppler velocimetry (UDV). The analysis is based on decomposition field into contributions distinct azimuthal symmetry or analytically known inertial modes corresponding calculation their amplitudes. show that predominant fraction kinetic energy precession-driven contained only within few large-scale modes. most striking observation...
We demonstrate an efficient magnetic dynamo due to precession-driven hydrodynamic turbulence in the local model. Dynamo growth rate increases with Poincar\'{e} and Prandtl numbers. Spectral analysis shows that acts over a broad range of scales: at large (system size) intermediate scales it is driven by 2D vortices shear background precessional flow, while smaller mainly 3D inertial waves. These results are important for understanding field generation amplification precessing planets stars.