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doctoral thesis
Boundary layer method for unsteady aerodynamic loads determination
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2010. urn:nbn:hr:235:562514
Majić, Frane
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Majić, F. (2010). Boundary layer method for unsteady aerodynamic loads determination (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:562514

Majić, Frane. "Boundary layer method for unsteady aerodynamic loads determination." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2010. https://urn.nsk.hr/urn:nbn:hr:235:562514

Majić, Frane. "Boundary layer method for unsteady aerodynamic loads determination." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2010. https://urn.nsk.hr/urn:nbn:hr:235:562514

Majić, F. (2010). 'Boundary layer method for unsteady aerodynamic loads determination', Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 25 November 2024, https://urn.nsk.hr/urn:nbn:hr:235:562514

Majić F. Boundary layer method for unsteady aerodynamic loads determination [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2010 [cited 2024 November 25] Available at: https://urn.nsk.hr/urn:nbn:hr:235:562514

F. Majić, "Boundary layer method for unsteady aerodynamic loads determination", Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2010. Available at: https://urn.nsk.hr/urn:nbn:hr:235:562514

Metadata
TitleBoundary layer method for unsteady aerodynamic loads determination
Title (croatian)Metoda graničnog sloja za određivanje nestacionarnih aerodinamičkih opterećenja
AuthorFrane Majić
MentorZdravko Virag (mentor)
MentorRalph Voss (komentor)
VIAF: 236683450
Committee memberZdravko Terze (predsjednik povjerenstva)
Committee memberZdravko Virag (član povjerenstva)
Committee memberRalph Voss (član povjerenstva)
VIAF: 236683450
Committee memberZoran Milas (član povjerenstva)
Committee memberMilan Vrdoljak (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2010-05-25, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Aviation, Rocket and Space Technology
Aircraft Construction and Design
Universal decimal classification
(UDC)		53 - Physics
Abstract
In this work a simple and accurate method for two-dimensional unsteady aerodynamic load determination on airfoil is developed. The method employs viscous-inviscid coupling. The inviscid flow is governed by the unsteady Euler equations solved by finite volume method on moving C-type rigid grid, while viscous flow is governed by steady boundary layer integral equations. The Euler equations are solved in conservative form, in transformed body-fitted coordinates. The viscous-inviscid coupling is performed by transpiration velocity incorporated in the boundary condition on airfoil. Therefore, the method requires no grid deformation for the boundary layer influence inclusion. The transition is predicted by the en method. The viscous-inviscid method is focused on subsonic and transonic flows, at high Reynolds number, with shock-wave appearance. The steady and unsteady test cases for three characteristic airfoils are performed, namely NACA 0012, NACA64A010, NLR 7301. The results are compared with experimental data and with unsteady RANS calculations. The method gives results which are in good agreement with experimental data and with calculated unsteady RANS results. The method has convergence problems in the test cases with separation. The method is applicable in the design processes where unsteady loads are required within reasonable time and with accuracy comparable with RANS methods.
Abstract (croatian)
U ovome radu razvijena je jednostavna i precizna metoda za odredivanje nestacionarnih aerodinamičkih optrećenja za dvodimenzionalno strujanje oko aeroprofila. Metoda koristi princip sprezanja viskoznog i neviskoznog dijela strujanja. Neviskozni dio strujanja je opisano nestacionarnim Eulerovim jednadžbama koje su riješene pomoću metode kontrolnih volumena na pomičnoj nedeformabilnoj mreži C-tipa. Viskozni dio strujanja je opisan integralnim jednadžbama graničnog sloja za stacionarno strujanje koje su riješene Runge-Kutta metodom četvrtog reda. Eulerove jednadžbe su riješene u konzervativnom obliku, u transformiranim prianjajućim koordinatama. Sprezanje viskoznog i neviskoznog dijela strujanja je izvedeno pomoću transpiracijske brzine koja je uključena u rubni uvjet na aeroprofilu. Iz tog razloga metoda ne zahtijeva deformaciju mreže da bi se uključio utjecaj graničnog sloja. Položaj tranzicije graničnog sloja je predviđen pomoću en metode. Metoda viskozno-neviskoznog sprezanja je usmjerena na podzvučno i kroz zvučno strujanje pri velikim Reynoldsovim brojevima, s pojavom udarnog vala. Izvršeni su proračuni za stacionarno i nestacionarno strujanje, za tri karakteristična aeroprofila NACA 0012, NACA64A010 i NLR 7301. Rezultati su usporedeni s eksperimentalnim podacima i s nestacionarnim RA\NS proračunima. Metoda daje rezultate koji se dobro slažu s eksperimentalnim podacima i s proračunatim nestacionarnim RANS rezultatima. U slučajevima strujanja s odvajanjem, metoda pokazuje probleme s konvergencijom. Metoda je primjenjiva u procesima razvoja gdje se zahtijeva proračun nestacionarnih opterećenja unutar prihvatljivog vremena računanja i s preciznošću koja je usporediva s RANS metodama.
Keywords
Keywords (croatian)
Languageenglish
URN:NBNurn:nbn:hr:235:562514
Promotion2020
Study programmeTitle: Mechanical Engineering and Naval Architecture
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-06-25 11:17:35