A5089262400- Fluid Dynamics and Turbulent Flows
- Computational Fluid Dynamics and Aerodynamics
- Model Reduction and Neural Networks
- Aerodynamics and Acoustics in Jet Flows
- Icing and De-icing Technologies
- Turbomachinery Performance and Optimization
- Advanced Thermodynamic Systems and Engines
- Scientific Research and Discoveries
- Surface Modification and Superhydrophobicity
- Lattice Boltzmann Simulation Studies
- Fluid Dynamics Simulations and Interactions
- Nuclear reactor physics and engineering
- Calibration and Measurement Techniques
- Fluid Dynamics and Heat Transfer
- Magnetic Properties and Applications
- Nuclear Engineering Thermal-Hydraulics
- Image Processing Techniques and Applications
- Wind and Air Flow Studies
- Parallel Computing and Optimization Techniques
- Astronomy and Astrophysical Research
- Statistical and numerical algorithms
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Superconducting and THz Device Technology
- Dark Matter and Cosmic Phenomena
Politecnico di Milano
2021-2025
KTH Royal Institute of Technology
2022-2024
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2022
Thales (Italy)
2010
Space (Italy)
2010
Alenia Aermacchi
2010
In this paper we present the Low Frequency Instrument (LFI), designed and developed as part of Planck space mission, ESA program dedicated to precision imaging cosmic microwave background (CMB). Planck-LFI will observe full sky in intensity polarisation three frequency bands centred at 30, 44 70 GHz, while higher frequencies (100-850 GHz) be covered by HFI instrument. The LFI is an array radiometers based on state-of-the-art Indium Phosphide cryogenic HEMT amplifiers implemented a...
Abstract A numerical investigation of the flow evolution over a pitching NACA 0012 airfoil incurring in deep dynamic stall phenomena is presented. The experimental data at Reynolds number Re = 135, 000 and reduced frequency k 0.1, provided by Lee Gerontakos, are compared to simulations using different turbulence models. After preliminary space time convergence study, two- three-dimensional URANS with models explored, highlighting advantages drawbacks. Then, turbulence-resolving capabilities...
This study investigates the flow evolution around a sinusoidal pitching NACA 0012 airfoil, defined by National Advisory Committee for Aeronautics, undergoing deep dynamic stall using wall-resolved large eddy simulation (LES) approach. Numerical results are assessed against experimental data from Lee and Gerontakos (2004) at Reynolds number Re = 135 000 reduced frequency k 0.1. A comprehensive analysis of computational model span size is presented, highlighting requirement span-to-chord ratio...
A particle tracking framework for the computation of collection efficiency in-flight ice accretion is presented. Algorithms are presented both Lagrangian and Eulerian descriptions droplets equations. Strengths weaknesses each method analyzed possible solutions described implemented. For solver, a automatic resolution adaptation introduced, strategy exploiting parallelism described. In frame scheme solution equations on unstructured 3D grids using relaxation approach. An hybrid approach also...
A machine learning framework is developed to compute the aerodynamic forces and moment coefficients for a pitching NACA0012 airfoil incurring in light deep dynamic stall. Four neural network frameworks of increasing complexity are investigated: two multilayer perceptrons convolutional networks. The framework, addition standard mean squared error loss, features an improved loss function loads. In total, five models investigated increasingly complexity. model, coupled with based on force...
The current work presents an innovative numerical technique for high-Reynolds/high-Mach number compressible flow simulations in complex configurations. In particular, the research combines a novel wall-modeled large-eddy simulation with sharp-interface immersed boundary method framework of high-order schemes. proposed approach enables best from wall modeling and boundary. first is concerned accurately dealing flows while avoiding direct control near-wall resolution; second related to...
We present URANOS-2.0, the second major release of our massively parallel, GPU-accelerated solver for compressible wall flow applications. This latest version represents a significant leap forward in initial tool, which was launched 2023 (De Vanna et al. [1]), and has been specifically optimized to take full advantage opportunities offered by cutting-edge pre-exascale architectures available within EuroHPC JU. In particular, URANOS-2.0 emphasizes portability compatibility improvements with...
We give the calibration and scientific performance parameters of Planck Low Frequency Instrument (LFI) measured during ground cryogenic test campaign. These characterise instrument response constitute our best pre-launch knowledge LFI performance. The shows excellent $1/f$ stability rejection instrumental systematic effects; noise that is most sensitive its kind. set will be updated flight operations through end mission.
Abstract Electromagnetics (EM) can be described, together with the constitutive laws, by four PDEs, called Maxwell's equations. “Quasi‐static” approximations emerge from neglecting particular couplings of electric and magnetic field related quantities. In case slowly time varying fields, if inductive resistive effects have to considered, whereas capacitive neglected, magneto quasi‐static (MQS) approximation applies. The solution MQS equations, traditionally obtained finite differences...
This paper focuses on the solution of dispersed phase Eulerian-Lagrangian one-way coupled particle laden flows.An efficient two-constraint domain partitioning for 2D and 3D unstructured hybrid meshes is proposed implemented in distributed memory architectures.A preliminary simulation, using a set representative particles, performed first to suitably tag cells with weight proportional probability being crossed by particle.In addition, an innovative parallel ray-tracing location algorithm...
The flow behavior of the two-blade MERIT rotor in hover, focusing on both pre-stall and stall regimes, is investigated through a comprehensive numerical-experimental approach. study leverages unsteady RANS simulations to compute thrust power polars validates them against experimental measurements. Valuable insights are provided into capabilities methods modern turbulence models for predicting performance across these critical operating conditions. Furthermore, numerical model incorporates...
A numerical investigation of the flow evolution over a pitching NACA 0012 airfoil incurring in deep dynamic stall phenomena is presented. The experimental data at Reynolds number Re = 135 000 and reduced frequency k 0.1, provided by Lee Gerontakos, are compared to simulations using different turbulence models. After preliminary space time convergence study, two- three-dimensional URANS with models explored, highlighting advantages drawbacks. Then, turbulence-resolving capabilities hybrid...
Abstract. The present work numerically investigates the flow evolution of a pitching NACA 0012 airfoil incurring in deep dynamic stall phenomena. experimental data at Reynolds number Re = 1.35 · 105 and reduced frequency k 0.1, provided by Lee et al., are compared to numerical simulation using different methods. Firstly, 2D URANS with turbulence models explored highlighting advantages drawbacks each strategy. On one hand, simulations able describe most characteristic features stall. other...
Dynamic stall is a challenging fluid dynamics phenomenon occurring during rapid transient motion of airfoils where the angle attack exceeds static angle. Understanding dynamic essential for designing efficient aerodynamic systems in applications such as helicopters, wind turbines, and specific aircraft maneuvers. The highly non-linear unsteady phenomena involved are to be included reduced order model. In this work, physics-based machine learning framework developed fast predict forces...
This study investigates the flow evolution past a pitching NACA0012 airfoil undergoing deep dynamic stall using wall-resolved large eddy simulation approach. Numerical results are validated against experimental data from Lee and Gerontakos at Reynolds number Re = 135 000 reduced frequency k 0.1. A comprehensive analysis of computational grid span size is presented, highlighting critical requirement for span-to-chord ratio least one. Furthermore, comparative assessment with state-of-the-art...
In this paper we present the test results of qualification model (QM) LFI instrument, which is being developed as part ESA Planck satellite. particular discuss calibration plan has defined main requirements radiometric tests and experimental setups. Then describe how these have been implemented in custom-developed cryo-facilities results. We conclude with a discussion lessons learned for testing Flight Model (FM).
Coupled fluid-particle simulations are routinely used in a variety of applications, ranging from respiratory droplet spreading to internal combustion engines, ink-jet printing in-flight ice accretion. The efficiency parallel algorithms simulate systems is strongly influenced by the different evolution flow and particles dynamics. Indeed, domain partitioning based on particle workload possibly sub-optimal terms number fluid volume elements associated each process. In this work, an efficient...
Large-scale parallel numerical simulations are fundamental for the understanding of a wide variety aeronautical problems. Mesh decomposition is applied to make use hardware. In particular, when using massively architecture, not only final quality mesh subdivision relevant. Also partitioning algorithm itself needs be robust as well efficient. A strategy dynamic based on runtime measurements presented. We integrate 'Geometric Partitioner' (GeMPa), which library Hilbert Space-Filling...
Particle tracking within an underlying flow field is routinely used to analyse both industrial processes and natural phenomena. In a computer code running on distributed-memory architecture, the different behaviour of fluid-particle systems must be taken into account properly balance element-particle subdivision among processes. unsteady simulations, parallel efficiency even more critical because it changes over time. Another challenging aspect scalable implementation initial particle...