Papers by Domenic D'Ambrosio
AIAA SCITECH 2022 Forum, 2022
2020 IEEE International Workshop on Metrology for Agriculture and Forestry (MetroAgriFor), 2020
This paper describes the preliminary design of an innovative concept rotary-wing Unmanned Aircraf... more This paper describes the preliminary design of an innovative concept rotary-wing Unmanned Aircraft System (UAS) for precision agriculture and aerial spraying applications. Aerial spraying of plant protection products and pesticides shows open challenges in terms of performance and regulatory requirements. In particular, the focus here is on highlighting the advantages of the proposed solution in performing precise and expeditious interventions, coping with the spray drift problem (i.e. minimization of drift). Flight performances and agronomists’ requirements are combined to define the mission and the aerial vehicle and spray system design.
INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2019, 2020
Proceedings, 2020
Computational fluid dynamics is recently being considered as an interesting tool to predict and a... more Computational fluid dynamics is recently being considered as an interesting tool to predict and analyze surfboards’ hydrodynamic characteristics for the purpose of optimizing the design. In this paper we define a systematic methodology that could be used to measure forces and moments exerted by the fluid on the surfboard. We define a “surfboard attitude” matrix, for instance varying the angle of attack and the tip surfacing height, and we fill it with values of drag, lift and moment. With these data, we can calculate the position of the center of pressure and analyze static equilibrium conditions in the presence of external forces that represent the weight of a surfer.
35th AIAA Plasmadynamics and Lasers Conference, 2004
An upwind numerical method for predicting ideal MHD high speed o ws is presented. It is based on ... more An upwind numerical method for predicting ideal MHD high speed o ws is presented. It is based on a ux-dierence splitting procedure with an approximate solver for the solution of the Riemann problem. The method is used for investigating numerically the admissibility of discontinuities that satisfy the jump conditions of the 1D planar problem. Fast and slow magnetic shock waves are numerically predicted and also particular shocks, which result from the merging of a slow and a fast magnetic compression waves. Moreover, compound waves are computed where a compression shock is attached to a rarefaction fan of the same family. Both slow and fast compound waves are predicted numerically, as well as transitional compound waves which represent the limiting case of a fast and a slow rarefaction fans attached each other through a compression shock.
Computational Fluid Dynamics 2000, 2001
The Aeronautical Sciences Division, Air Vehicles Directorate, Air Force Research Laboratory (AFRL... more The Aeronautical Sciences Division, Air Vehicles Directorate, Air Force Research Laboratory (AFRL/RBA) completed a program including modeling and experimental work of the effect of plasmas on air flows. Heating, magnetohydrodynamic (MHD) and electrodynamic (EHD) effects are considered. The direct current plasmas are normal or abnormal glow discharges and the alternating current plasmas are dielectric barrier discharges. Each of these plasma types has actuating effects in different flow regimes. In addition to plasma effects, the phenomenon of pure heating was studied. Path finding numerical simulations of weakly ionized airflows in a hypersonic flow have been successfully accomplished. The research results from this modeling work consist of a basic formulation of the magneto-aerodynamic equations, a plasma model based on the drift-diffusion theory, numerical algorithm development, and computational results. In addition, detailed computer models of the effect of energy deposition on ...
16th AIAA Computational Fluid Dynamics Conference, 2003
Numerical experiments are presented aimed at comparing the behavior of state-to-state chemical ki... more Numerical experiments are presented aimed at comparing the behavior of state-to-state chemical kinetics models with respect to the macroscopic thermochemical non-equilibrium models that are usually used in the numerical computation of high temperature hypersonic flows. The comparison is focused both on the differences in the numerical results and on the computational effort related to the adoption of the each approach.
40th Thermophysics Conference, 2008
A finite-volume two-dimensional heat-conduction solver for solid bodies has been developed and th... more A finite-volume two-dimensional heat-conduction solver for solid bodies has been developed and then coupled with a hypersonic fluid solver with the aim of evaluating the thermal load a body has to withstand when it is immersed in a high-speed flow. The focus of this work is on the coupling that can be enforced between the two solvers: a tight coupling technique has been developed, which is paticularly suitable for unsteady time-accurate calculations. However, considering the very different time scales of the fluid dynamic and heat conduction phenomena, this may lead to unacceptable computational times. An alternative approach proposed in this article, valid for steady problems, is to proceed with "quasi-stationary" states, allowing the heat-conduction solver to evolve alone at greater ∆t until a threshold on the T W is reached; after that the two solvers are again run together so that the fluid-dynamic field can "relax". The comparison made with experimental data, where available, show a fairy good agreement. Also, the influence of the thresholds on the numerical solutions was investigated: it was found that they have a quite strong impact on the results and their choice should be made with caution.
This paper deals with the numerical rebuilding of an experimental test performed at Alta Spa in t... more This paper deals with the numerical rebuilding of an experimental test performed at Alta Spa in the frame of the italian project CAST on a double cone geometry, obtained scaling down the one already tested in the LENS facility at Calspan [1]. Also the nozzle flow was simulated, in order to get the correct non-equilibrium freestream conditions for the test article. The results are compared with the experimental data provided by Alta Spa [2]. A sensitivity analysis has been also performed in order to verify the effectof a number of parameters for which some uncertainties are still present.
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Papers by Domenic D'Ambrosio