Turbocharger turbine and exhaust manifold flow computation with the Space-Time Variational Multiscale Method and Isogeometric Analysis

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dc.citation.firstpage764en_US
dc.citation.journalTitleComputers & Fluidsen_US
dc.citation.lastpage776en_US
dc.citation.volumeNumber179en_US
dc.contributor.authorOtoguro, Yutoen_US
dc.contributor.authorTakizawa, Kenjien_US
dc.contributor.authorTezduyar, Tayfun E.en_US
dc.contributor.authorNagaoka, Kenichiroen_US
dc.contributor.authorMei, Senen_US
dc.date.accessioned2019-08-28T16:10:12Zen_US
dc.date.available2019-08-28T16:10:12Zen_US
dc.date.issued2019en_US
dc.description.abstractWe address the computational challenges encountered in turbocharger turbine and exhaust manifold flow analysis. The core computational method is the Space–Time Variational Multiscale (ST-VMS) method, and the other key methods are the ST Isogeometric Analysis (ST-IGA), ST Slip Interface (ST-SI) method, ST/NURBS Mesh Update Method (STNMUM), and a general-purpose NURBS mesh generation method for complex geometries. The ST framework, in a general context, provides higher-order accuracy. The VMS feature of the ST-VMS addresses the computational challenges associated with the multiscale nature of the unsteady flow in the manifold and turbine, and the moving-mesh feature of the ST framework enables high-resolution computation near the rotor surface. The ST-SI enables moving-mesh computation of the spinning rotor. The mesh covering the rotor spins with it, and the SI between the spinning mesh and the rest of the mesh accurately connects the two sides of the solution. The ST-IGA enables more accurate representation of the turbine and manifold geometries and increased accuracy in the flow solution. The STNMUM enables exact representation of the mesh rotation. The general-purpose NURBS mesh generation method makes it easier to deal with the complex geometries we have here. An SI also provides mesh generation flexibility in a general context by accurately connecting the two sides of the solution computed over nonmatching meshes. That is enabling us to use nonmatching NURBS meshes here. Stabilization parameters and element length definitions play a significant role in the ST-VMS and ST-SI. For the ST-VMS, we use the stabilization parameters introduced recently, and for the ST-SI, the element length definition we are introducing here. The model we actually compute with includes the exhaust gas purifier, which makes the turbine outflow conditions more realistic. We compute the flow for a full intake/exhaust cycle, which is much longer than the turbine rotation cycle because of high rotation speeds, and the long duration required is an additional computational challenge. The computation demonstrates that the methods we use here are very effective in this class of challenging flow analyses.en_US
dc.identifier.citationOtoguro, Yuto, Takizawa, Kenji, Tezduyar, Tayfun E., et al.. "Turbocharger turbine and exhaust manifold flow computation with the Space-Time Variational Multiscale Method and Isogeometric Analysis." <i>Computers & Fluids,</i> 179, (2019) Elsevier: 764-776. https://doi.org/10.1016/j.compfluid.2018.05.019.en_US
dc.identifier.doihttps://doi.org/10.1016/j.compfluid.2018.05.019en_US
dc.identifier.urihttps://hdl.handle.net/1911/107373en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsThis is an open access article under the CC BY-NC-ND license. ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )en_US
dc.rights.urihttp://creativecommons.org/licenses/BY-NC-ND/4.0/en_US
dc.subject.keywordTurbochargeren_US
dc.subject.keywordTurbineen_US
dc.subject.keywordExhaust manifolden_US
dc.subject.keywordSpace–Time Variational Multiscale Methoden_US
dc.subject.keywordST-VMSSTen_US
dc.subject.keywordSlip Interface methoden_US
dc.subject.keywordST-SIen_US
dc.subject.keywordST Isogeometric Analysisen_US
dc.subject.keywordST-IGAen_US
dc.titleTurbocharger turbine and exhaust manifold flow computation with the Space-Time Variational Multiscale Method and Isogeometric Analysisen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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