Why Perform Code‐to‐Code Comparisons: A Vacuum Arc Discharge Simulation Case Study |
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| Authors: | H Timko P S Crozier M M Hopkins K Matyash R Schneider |
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| Institution: | 1. CERN, Genève 23, CH‐1211, Switzerland;2. Helsinki Institute of Physics and Department of Physics, P. O. Box 43, FIN‐00014 University of Helsinki, Finland;3. Scalable Algorithms Sandia National Laboratories, P.O. Box 5800, MS 1322 Albuquerque, NM 87185, U.S.A.;4. Nanoscale and Reactive Processes Sandia National Laboratories, P.O. Box 5800, MS 0836 Albuquerque, NM 87185, U.S.A.;5. Max‐Planck‐Institut für Plasmaphysik, EURATOM Association, Wendelsteinstr. 1, D‐17491 Greifswald, Germany;6. Institut für Physik, Ernst‐Moritz‐Arndt‐Universit?t, Felix‐Hausdorff Str. 6, D‐17489 Greifswald, Germany |
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| Abstract: | Numerical modeling is increasingly becoming an indispensable tool for investigations in many fields of physics. Such modeling is especially useful in today's big science projects as a tool that can provide predictions and design parameters. The reliability of simulation results is thus essential. Code‐to‐code comparisons can help increase our confidence in simulation results, especially when other verification methods – such as comparison to theoretical models or experimental results – are limited or unavailable. In this paper, we describe a code‐to‐code comparison exercise wherein we compare one‐dimensional vacuum arc discharge simulation results from two independent particle‐in‐cell (PIC) codes. As part of our case study, we define a vacuum arc discharge test problem that can be used by other research groups for further comparison. Early disagreement between the two sets of our results motivated us to re‐examine the underlying methods in our codes. After remedying discrepancies, we observe good agreement in vacuum arc discharge time‐to‐breakdown, as well as in the time evolution of particle and current densities. This exercise demonstrates the usefulness of code‐to‐code comparisons and provides an example case study for the benefit of other research groups who may wish to carry out similar code‐to‐code comparisons (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| Keywords: | Code‐to‐code comparison vacuum arcs PIC |
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