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| Abstract No.: |
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Scheduled at:
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Wednesday, March 28, 2012, SuperC, Hall Ford 2:00 PM
Innovations in EBW
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| Title: |
Automatic generation of EGUN input files to provide enhanced mesh resolution for the numerical simulation of small cathodes of welding guns
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| Authors: |
Reinard Becker* / Scientific Software Service, Germany
Michael Mücke / Global Welding Technologies AG, Germany
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| Abstract: |
The dimensions of cathodes in welding guns are typically about 1/100 of the electrostatic important tank dimensions for the gun. Well established computer programs, like EGN2W(C) (former EGUN) are based on the discretisation of Poisson's equation on a quadratic grid and a minimum of 10 meshes along the cathode surface is required to simulate the emission properties with sufficient detail. The resulting number of more than 1 million meshes for the problem makes the computation slow and error prone - even on modern computers - because the convergence of the field calculation and the accuracy of ray tracing will be reduced. A well known solution to this problem is the use of a field line and of an equipotential line to cut-out a part of the whole geometry and to provide a higher mesh resolution in the cut-out region. In this paper we report on the automatic generation of an input file for a cut-out region of a welding gun using computed field and equipotential lines from a former run with less mesh resolution.
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