DC FieldValueLanguage
dc.contributor.advisorWatmuff, Jon-
dc.contributor.authorSchirra, Julian C.-
dc.date.accessioned2025-07-08T09:19:58Z-
dc.date.available2025-07-08T09:19:58Z-
dc.date.issued2017-02-02-
dc.identifier.urihttps://hdl.handle.net/20.500.12738/17833-
dc.description.abstractFor highly non-planar lifting systems like the box wing, induced drag predictions based on common potential-flow methods can have limited accuracy. This is primarily related to the linear, fixed-wake surrogate models, which neglect the correlation of the effective height-to-span ratio and system angle of attack or insufficiently account for free-wake deformations such as deflection and roll-up effects. Dependent on the vertical and horizontal wing arrangement of simplified box wing and biplane configurations and the system angle of attack, the present research analyses the unknown impact of wake model effects, investigates the accuracy of potential-flow induced drag predictions against an Euler-flow reference and explores the influence of higher-order wake effects. The computational expense of considered methodologies is assessed to evaluate their applicability within an aerodynamic design and optimization methodology for highly non-planar lifting systems. Under certain conditions, higher-order wake and wake surrogate effects are confirmed to impact on the induced drag prediction. The body-fixed wake model is found generally inappropriate for induced drag estimation of present lifting systems, whereas the freestream-fixed wake model provides consistent results. Positive-staggered systems at positive angels of attack are found particularly prone to higher-order wake effects, due to the vertical contraction of wake trajectories, which leads to smaller effective height-to-span ratios than compared with negative stagger and thus closer interactions between trailing wakes and lifting surfaces. A relaxed, force-free wake model is found compulsory to enable fast but accurate induced drag predictions when using potential-flow methods for the analysis of highly non-planar lifting systems with significant positive stagger.en
dc.language.isoenen_US
dc.subjectaircraften_US
dc.subjectboxwingen_US
dc.subjectnon-planaren_US
dc.subjectstaggeren_US
dc.subjectheighten_US
dc.subjectspanen_US
dc.subjectangle of attacken_US
dc.subjectAOAen_US
dc.subjectliften_US
dc.subjectdragen_US
dc.subjectinduced dragen_US
dc.subjectlifting systemen_US
dc.subjectwakeen_US
dc.subjecthigher-order wake effecten_US
dc.subjectpotential flowen_US
dc.subjectcomputational fluid dynamicsen_US
dc.subjectCFDen_US
dc.subject.ddc620: Ingenieurwissenschaftenen_US
dc.titleAccurate induced drag prediction for highly non-planar lifting systemsen
dc.typeThesisen_US
dc.description.versionPeerRevieweden_US
local.contributorCorporate.otherFH Aachen-
thesis.grantor.placeMelbourneen_US
thesis.grantor.universityOrInstitutionRMIT Universityen_US
tuhh.contributor.refereeScholz, Dieter-
tuhh.oai.showtrueen_US
tuhh.publication.instituteForschungsgruppe Flugzeugentwurf und -systeme (AERO)en_US
tuhh.publication.instituteDepartment Fahrzeugtechnik und Flugzeugbauen_US
tuhh.publication.instituteFakultät Technik und Informatiken_US
tuhh.publication.instituteRMIT Universityen_US
tuhh.publisher.doi10.25439/rmt.27589401-
tuhh.type.opusDissertation-
dc.type.casraiDissertation-
dc.type.dinidoctoralThesis-
dc.type.driverdoctoralThesis-
dc.type.statusinfo:eu-repo/semantics/publishedVersionen_US
dc.type.thesisdoctoralThesisen_US
dcterms.DCMITypeText-
local.comment.externalFurther Supervisor: Bauschat, Michael (FH Aachen). The thesis examination did not comprise an oral component or doctoral viva.en_US
item.creatorGNDSchirra, Julian C.-
item.grantfulltextnone-
item.openairetypeThesis-
item.advisorGNDWatmuff, Jon-
item.fulltextNo Fulltext-
item.languageiso639-1en-
item.cerifentitytypePublications-
item.creatorOrcidSchirra, Julian C.-
item.openairecristypehttp://purl.org/coar/resource_type/c_46ec-
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