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dc.contributor.authorHosder, Serhaten_US
dc.date.accessioned2014-03-14T20:40:02Z
dc.date.available2014-03-14T20:40:02Z
dc.date.issued2001-06-15en_US
dc.identifier.otheretd-06152001-121441en_US
dc.identifier.urihttp://hdl.handle.net/10919/33582
dc.description.abstractSteady and unsteady flow over a generic Suboff submarine model is studied. The skin-friction magnitudes are measured by using hot-film sensors each connected to a constant temperature anemometer. The local minima in the skin-friction magnitudes are used to obtain the separation locations. Steady static pressure measurements on the model surface are performed at 10° and 20° angles of attack. Steady and unsteady results are presented for two model configurations: barebody and sail-on-side case. The dynamic plunge-pitch-roll model mount (DyPPiR) is used to simulate the pitchup maneuvers. The pitchup maneuver is a linear ramp from 1° to 27° in 0.33 seconds. All the tests are conducted at ReL=5,500,000 with a nominal wind tunnel speed of 42.7±1 m/s. Steady results show that the flow structure on the leeward side of the barebody can be characterized by the crossflow separation. In the sail-on-side case, the separation pattern of the non-sail region follow the barebody separation trend closely. The flow on the sail side is strongly affected by the presence of the sail and the separation pattern is different from the crossflow separation. The flow in the vicinity of the sail-body junction is dominated by the horseshoe type separation. Unsteady results of the barebody and the non-sail region of the sail-on-side case show significant time lags between unsteady and steady crossflow separation locations. These effects produce the difference in separation topology between the unsteady and steady flowfields. A first-order time lag model approximates the unsteady separation locations reasonably well and time lags are obtained by fitting the model equation with the experimental data. The unsteady separation pattern of the sail side does not follow the quasi-steady data with a time lag and the unsteady separation structure is different from the unsteady crossflow separation topology observed for the barebody and the non-sail region of the sail-on-side case.en_US
dc.publisherVirginia Techen_US
dc.relation.hasparttitle_abstract.pdfen_US
dc.relation.haspartchapter7_ref.pdfen_US
dc.relation.haspartchapter6.pdfen_US
dc.relation.haspartchapter5.pdfen_US
dc.relation.haspartchapter4.pdfen_US
dc.relation.haspartchapter3.pdfen_US
dc.relation.haspartchapter2.pdfen_US
dc.relation.haspartchapter1.pdfen_US
dc.relation.haspartappend_vita.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectunsteady flowen_US
dc.subjectskin-frictionen_US
dc.subjecthot-filmen_US
dc.subjectseparationen_US
dc.titleUnsteady Skin-Friction Measurements on a Maneuvering Darpa2 Suboff Modelen_US
dc.typeThesisen_US
dc.contributor.departmentAerospace and Ocean Engineeringen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairSimpson, Roger L.en_US
dc.contributor.committeememberDevenport, William J.en_US
dc.contributor.committeememberGrossman, Bernard M.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06152001-121441/en_US
dc.date.sdate2001-06-15en_US
dc.date.rdate2002-06-22
dc.date.adate2001-06-22en_US


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