em zooming procedure in ansys maxwell 3d

Abstract The severity of electromagnetic (EM) loads produced by plasma disruptions is one of the most concerning issues for the ITER in-vessel components design. To investigate the effects of fast EM transients on plasma surrounding structures during a disruption the Secondary Excitations (SE) method is used. This is an interface procedure to couple 2D plasma equilibrium codes with Finite Elements (FE) software. The Zooming Approach (ZA) used for the analyses presented here is a particular implementation of the SE method. The aim of this work is the demonstration that the ZA can be effectively applied in case of ANSYS Maxwell 3D analyses combining the ease of use of the Maxwell code with the computational efficiency of the ZA. The work has been carried out evaluating the EM loads acting on the ITER Diagnostic Equatorial Port Plug (EPP) during major disruptions scenario and comparing these loads with those obtained in previous analyses. Additional analyses have been performed to study the effect of ferromagnetic materials on EM loads in order to investigate ANSYS Maxwell capabilities in simulating non-linear magnetic properties

Thermal tests of a scaled down mock-up of CP5.2 packaging system: Post-test analysis

Abstract In this study, the thermal performances of an Italian CP5.2 packaging system aimed at the transportation of bituminised wastes (i.e. engulfing fire of 800 °C for 30 min according to the IAEA regulation) are presented. Due to the high risk of auto-ignition of the bituminised wastes, that are stowed in the drums, in turn, immersed in the cement matrix of the CP 5.2, it was decided to test firstly a small scale mock-up. The mock up, containing only one drum with bituminised waste, was designed and built at the Department of Civil and Industrial Engineering (DICI) of the University of Pisa. The experimental test was carried out at Lab. Guerrini of the University of Pisa. Results demonstrated that after half an hour of fire exposure at 800 °C, the temperature in the bituminised waste package is below that of auto-ignition of the bitumen. The obtained results allowed in addition to set up the test procedure to adopt for fire test of a full scale CP5.2 system. Post test analysis, which was carried out by performing FEM analysis, is also presented and results compared to the experimental ones

EM Zooming Procedure in ANSYS Maxwell 3D

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

Thermal tests of a scaled down mock-up of CP5.2 packaging system: Post-test analysis

Abstract In this study, the thermal performances of an Italian CP5.2 packaging system aimed at the transportation of bituminised wastes (i.e. engulfing fire of 800 °C for 30 min according to the IAEA regulation) are presented. Due to the high risk of auto-ignition of the bituminised wastes, that are stowed in the drums, in turn, immersed in the cement matrix of the CP 5.2, it was decided to test firstly a small scale mock-up. The mock up, containing only one drum with bituminised waste, was designed and built at the Department of Civil and Industrial Engineering (DICI) of the University of Pisa. The experimental test was carried out at Lab. Guerrini of the University of Pisa. Results demonstrated that after half an hour of fire exposure at 800 °C, the temperature in the bituminised waste package is below that of auto-ignition of the bitumen. The obtained results allowed in addition to set up the test procedure to adopt for fire test of a full scale CP5.2 system. Post test analysis, which was carried out by performing FEM analysis, is also presented and results compared to the experimental ones