New Methods to Speed-up the Boundary Element Method in LS-DYNA

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datacite.relationtype.isvariantformofhttp://hdl.handle.net/2003/37010
datacite.relationtype.isvariantformofhttp://hdl.handle.net/2003/37011
dc.contributor.authorL‘Eplattenier, Pierre
dc.contributor.authorAshcraft, Cleve
dc.contributor.authorRouet, François-Henry
dc.contributor.authorWeisbecker, Clement
dc.contributor.authorBateau-Meyer, Sarah
dc.date.accessioned2018-07-10T13:57:55Z
dc.date.available2018-07-10T13:57:55Z
dc.date.issued2018-05-14
dc.description.abstractLS-DYNA is a general purpose explicit and implicit finite element program used to analyse the non linear dynamic response of three-dimensional solids and fluids. It is developed by Livermore Software Technology Corporation (LSTC). An electromagnetism (EM) module has been added to LS-DYNA for coupled mechanical/thermal/electromagnetic simulations, which have been extensively performed and benchmarked against experimental results for Magnetic Metal Forming (MMF) and Welding (MMW) applications. These simulations are done using a Finite Element Method (FEM) for the conductors coupled with a Boundary Element Method (BEM) for the surrounding air. The BEM has the advantage that it does not require an air mesh, which can be difficult to build when the gaps between conductors are very small, and to adapt when the conductors are moving, with contact possibly arising. Besides, the BEM does not require the introduction of infinite boundary conditions which are somehow artificial and can create discrepancies. On another hand, it generates dense matrices which take time to assemble and solve, and require a lot of memory. In LS-DYNA, the memory issue is handled by using low rank approximations on the off diagonal sub-blocks of the BEM matrices, creating a so-called Block Low Rank (BLR) matrix structure. The issue of the assembly and solve time is now being studied, and we present the so called “Multi-Center” (MC) method where the computation of the far-field submatrices is greatly reduced and the solve time somehow reduced. We will present the method as well as some first results.en
dc.identifier.urihttp://hdl.handle.net/2003/36968
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-18967
dc.language.isoen
dc.relation.ispartof8th International Conference on High Speed Formingen
dc.subjectsimulationen
dc.subjectboundary element method (BEM)en
dc.subjectelectroformingen
dc.subject.ddc620
dc.subject.ddc670
dc.titleNew Methods to Speed-up the Boundary Element Method in LS-DYNAen
dc.typeText
dc.type.publicationtypeconferenceObject
dcterms.accessRightsopen access
eldorado.secondarypublicationfalse

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