ETD

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Tesi etd-01242017-223351


Tipo di tesi
Tesi di laurea magistrale
Autore
GIORLA, DALILA
URN
etd-01242017-223351
Titolo
EM Zooming Procedure in ANSYS Maxwell 3D
Dipartimento
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA NUCLEARE
Relatori
relatore Prof.ssa Lo Frano, Rosa
tutor Ing. Roccella, Riccardo
relatore Prof. Aquaro, Donato
Parole chiave
  • Disruptions
  • EM loads
  • ANSYS Maxwell 3D
  • ITER
Data inizio appello
20/02/2017
Consultabilità
Non consultabile
Data di rilascio
20/07/2026
Riassunto
The electromagnetic (EM) loads produced by plasma disruptions are the most concerning issue for the ITER in-vessel components design. During the last years several numerical methods have been developed in order to evaluate the effect of fast EM transients on the plasma surrounding structures. The Secondary Excitations (SE) method is an interface procedure that allows the transfer of information from 2D plasma equilibrium codes to Finite Element (FE) codes. The SE are an assembly of active toroidal conductors that reproduce the EM transient during a disruption. The SE method can be applied for the evaluation of the EM loads acting on a component in two different approaches: a) the Global Approach (GA), in which the SE reproduce the plasma source field, and the component and all the relevant structures are outside the axisymmetric conductors assembly; b) the Zooming Approach (ZA), in which the sample and the main toroidal components are enclosed in the SE array. In the ZA the SE include not only the plasma source field but also the effect of the eddy currents induced in the main toroidal continuous structures during the disruption scenario. The aim of this work is the implementation of the ZA in the ANSYS Maxwell 3D code. The basic idea is to take advantage of the implementation in a user friendly code of a numerical procedure that allows the reduction of the computational effort without loss of accuracy compared to the GA. The EM analysis has been performed focusing on the evaluation of EM loads on the ITER Diagnostic Generic Equatorial Port Plug (GEPP) during major disruptions scenario. A 20º sector of ITER Vacuum Vessel completed of Diagnostic GEPP and Blanket Modules has been modelled and reshaped to fit the SE zooming region. The current input data for the SE have been obtained from the SE method interface software: the EMAG code. In order to overcome some limits in the post processing phase of ANSYS Maxwell 3D, a dedicated algorithm has been developed for the extrapolation of EM forces and moments acting on the Diagnostic GEPP. The results have shown a good agreement with a previous GA analysis carried out by the Princeton Plasma Physics Laboratory (PPPL). A further study has been developed for the evaluation of EM loads in presence of ferromagnetic materials with the aim to investigate the ANSYS Maxwell code capabilities in simulating ferromagnetism effects. In this case, the central first walls of the Diagnostic GEPP have been modelled as composed of EUROFER.
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