A solution adaptive structured-unstructured grid procedure for unsteady flows

dc.contributor.advisor R. G. Rajagopalan
dc.contributor.advisor J. C. Tannehill
dc.contributor.author Mathur, Sanjay
dc.contributor.department Aerospace Engineering
dc.date 2018-08-23T12:23:07.000
dc.date.accessioned 2020-06-30T07:02:39Z
dc.date.available 2020-06-30T07:02:39Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 1993
dc.date.issued 1993
dc.description.abstract <p>A solution adaptive hybrid grid method for the computation of two-dimensional, unsteady flows is presented. The method is capable of handling multiple component, complex geometries in relative motion, such as those encountered in turbomachinery analysis. The numerical approach uses a hybrid structured-unstructured zonal grid topology along with modeling equations and solution techniques that are most appropriate in the individual domains, thus combining the advantages of both structured and unstructured grid methods. The viscous flow region in the immediate vicinity of the airfoils is resolved using a third-order accurate, implicit, upwind solution of the Navier-Stokes equations on structured, O-type grids. Explicit solutions of the Euler equations are obtained in the rest of the domain that consists of an unstructured mesh made up of triangular cells. The use of both central- and upwind-differenced flux schemes is investigated for the unstructured domains. Methodologies for accurate, conservative transfer of information at the interface between the structured and unstructured domains as well as that between two unstructured grids in relative motion are developed. An efficient and robust solution adaptation strategy is developed which incorporates both refinement and de-refinement capabilities for the unstructured grid regions. Both time-averaged and time-resolved results are presented for test cases and are compared with available experimental data. The quality of the results obtained by the present method is comparable with those obtained by methods based on fully structured grids. Calculations performed using the solution adaptation capabilities are also presented.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/10170/
dc.identifier.articleid 11169
dc.identifier.contextkey 6386121
dc.identifier.doi https://doi.org/10.31274/rtd-180813-9572
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/10170
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/63287
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/10170/r_9321195.pdf|||Fri Jan 14 18:15:07 UTC 2022
dc.subject.disciplines Aerospace Engineering
dc.subject.keywords Aerospace engineering and engineering mechanics
dc.subject.keywords Aerospace engineering
dc.title A solution adaptive structured-unstructured grid procedure for unsteady flows
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 047b23ca-7bd7-4194-b084-c4181d33d95d
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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