Space–time VMS flow analysis of a turbocharger turbine with isogeometric discretization: computations with time-dependent and steady-inflow representations of the intake/exhaust cycle

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dc.citation.firstpage1403en_US
dc.citation.issueNumber5en_US
dc.citation.journalTitleComputational Mechanicsen_US
dc.citation.lastpage1419en_US
dc.citation.volumeNumber64en_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.authorAvsar, Rehaen_US
dc.contributor.authorZhang, Yutongen_US
dc.date.accessioned2019-12-12T17:25:28Zen_US
dc.date.available2019-12-12T17:25:28Zen_US
dc.date.issued2019en_US
dc.description.abstractMany of the computational challenges encountered in turbocharger-turbine flow analysis have been addressed by an integrated set of space–time (ST) computational methods. The core computational method is the ST variational multiscale (ST-VMS) method. The ST framework provides higher-order accuracy in general, and the VMS feature of the ST-VMS addresses the computational challenges associated with the multiscale nature of the unsteady flow. The moving-mesh feature of the ST framework enables high-resolution computation near the rotor surface. The ST slip interface (ST-SI) method 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 Isogeometric Analysis enables more accurate representation of the turbine geometry and increased accuracy in the flow solution. The ST/NURBS Mesh Update Method enables exact representation of the mesh rotation. A general-purpose NURBS mesh generation method makes it easier to deal with the complex geometries involved. An SI also provides mesh generation flexibility in a general context by accurately connecting the two sides of the solution computed over nonmatching meshes, and that is enabling the use of nonmatching NURBS meshes in the computations. The computational analysis needs to cover 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. As one way of addressing that challenge, we propose here to calculate the turbine efficiency for the intake/exhaust cycle by interpolation from the efficiencies associated with a set of steady-inflow computations at different flow rates. The efficiencies obtained from the computations with time-dependent and steady-inflow representations of the intake/exhaust cycle compare well. This demonstrates that predicting the turbine performance from a set of steady-inflow computations is a good way of addressing the challenge associated with the multiple time scales.en_US
dc.identifier.citationOtoguro, Yuto, Takizawa, Kenji, Tezduyar, Tayfun E., et al.. "Space–time VMS flow analysis of a turbocharger turbine with isogeometric discretization: computations with time-dependent and steady-inflow representations of the intake/exhaust cycle." <i>Computational Mechanics,</i> 64, no. 5 (2019) Springer: 1403-1419. https://doi.org/10.1007/s00466-019-01722-2.en_US
dc.identifier.digitalOtoguro2019en_US
dc.identifier.doihttps://doi.org/10.1007/s00466-019-01722-2en_US
dc.identifier.urihttps://hdl.handle.net/1911/107868en_US
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.rightsThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.en_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/),en_US
dc.subject.keywordTurbochargeren_US
dc.subject.keywordTurbineen_US
dc.subject.keywordSpace–time variational multiscale method (ST-VMS)en_US
dc.subject.keywordST slip interface method (ST-SI)en_US
dc.subject.keywordST isogeometric analysis (ST-IGA)en_US
dc.subject.keywordSteady-inflow representationen_US
dc.titleSpace–time VMS flow analysis of a turbocharger turbine with isogeometric discretization: computations with time-dependent and steady-inflow representations of the intake/exhaust cycleen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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