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Towards complex physically-based lightning simulations

pubblicazioni - Memoria

Towards complex physically-based lightning simulations

Questo lavoro pu essere visto come il primo passo per la simulazione della progressione del leader tramite modelli pi prossimi alla reale fisica che regola i processi di scarica.

The numerical simulation of the propagation of lightning strikes is an important field of applied physics with many applications in the electric industry. A reliable prediction of the lightning phenomenon makes it possible to optimize the protections of power lines and to enhance the reliability of power delivery.

Most of the simulation tools developed in this field are based on semi-empirical approaches: they combine the exact computation of the electric field with the empirical description of the progression of the leader head. Some more complete physical schemes can be found in the literature: they embed the drift of charged species, such as electrons, positive and negative ions, with the chemical reactions.

This model is currently used to describe the corona and the streamer phenomena. The streamer model, even though physically sound, is very expensive to solve and is usually limited to two-dimensional axis-symmetric geometries. In particular, there are some numerical difficulties that limit the time step and the mesh size.In this work we analyse more closely these numerical problems and the possible methods in order to circumvent them. This can be seen as a first step to simulate the lightning progression with models that are closer to the real physics of the discharge phenomenon.

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