Giacomo Lari

Research interests


Celestial Mechanics

When we consider the motion of a celestial body (e.g. a planet), the gravitational attraction of the main body (e.g. the Sun) can be insufficient to obtain an orbit that approximates the real one with the wanted accuracy. Just considering the perturbation of a third body we can obtain very interesting effects on the motion, such as in the case of mean motion resonances of asteroids or between satellites. For my research activity I am studying the Laplace resonance between the Galilean satellites of Jupiter (Io, Europa, Ganymede and Callisto): the resonant interaction between the moons and the dissipative effects due to the tides with Jupiter, make the satellites' orbits evolve. This mechanism is well know in celestial mechanics theory, but its magnitude in the case of Jupiter is still a discussion matter into the scientific community.

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Space Missions

There are several interplanetary missions that are operating in the Solar System. Apart from NASA (National Aeronautics and Space Administration), also ESA (European Space Agency) makes great efforts in its own space program. JUICE mission is a future European mission that will explore the Jovian system, obtaining different kind of data on the Galilean satellites. Departing from the orbit determination software ORBIT14, developed by the Celestial Mechanics Group of Pisa, I am performing different simulations in order to study the performances of the mission. Apart from some common dynamical parameters, such as the moons' gravitational coefficients, I am interested in the determination of the position of the Galilean satellites and the dissipation due to the tidal forces.

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Computational Fluid Dynamics

In the case of a volcanic eruption the magma flows from the cone to the areas below. A possible model that can predict the path of the fluid is described by the Shallow Water equations, for which it is considered a low fluid thickness and a 2-dimensional motion. In order to obtain realistic simulations, it is necessary to consider a suitable rheology, that adds friction forces to the model. Recently I worked on a project of the INGV, under the supervision of Dr. de' Michieli Vitturi, where we developed a numerical solver for the Shallow Water equations (IMEX_SfloW2D software), in order to study Etna eruption events.

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Publications

Conferences and Meetings

Visits

Summer schools