| Title: | Aerodynamic analysis of an oscillating airfoil in a power-extraction regime using the compressible Navier-Stokes equations with efficient and accurate low-speed preconditioning |
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| Authors: | ID Drofelnik, Jernej (Author)
ID Škerget, Leopold (Mentor) More about this mentor... 
ID Campobasso, Sergio (Comentor) |
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| Files: |  UNI_Drofelnik_Jernej_2012.pdf (2,40 MB)
MD5: DE9AB7038188A8C3B7C4CCD7FF1CC4D5
PID: 20.500.12556/dkum/f3868526-6e52-47fc-b0d1-97c86d946463
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| Language: | English |
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| Work type: | Undergraduate thesis |
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| Typology: | 2.11 - Undergraduate Thesis |
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| Organization: | FS - Faculty of Mechanical Engineering
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| Abstract: | A wing that is simultaneously heaving and pitching may extract energy from an oncoming air flow, thus acting as turbine. The purpose of this study was to analyse the relationship between the aerodynamics and the theoretical performance of this device by means of timedependent
laminar flow simulations performed with a research compressible finite volume Navier-Stokes solver COSA. In presented analyses, which confirm the findings of another
independent study, the efficiency of the power extraction of this device can be of the order of 35 %, and such an efficient operating condition is characterized due to the favourable effects of a strong dynamic stall.
This study is a part of a wider research programme of Dr. Campobasso’s group at University of Glasgow, aiming to develop a general-purpose computational framework for
unsteady aerodynamic and aeroacoustic wind energy engineering. In view of aeroacoustic applications, the developed flow solver uses the compressible formulation of the Navier-Stokes equations with carefully optimized low-speed preconditioning. To demonstrate the modeling capabilities, the accuracy and the high computational performance of the developed low-speed preconditioning technology, the unsteady aerodynamics of the energy-extracting device is simulated by using a computationally challenging freestream Mach number of 0.001. A mixed preconditioning strategy that maintains both the nominal accuracy and the computational efficiency of the solver also for time-dependent low-speed problems is presented. A fundamental element of novelty of this study is a thorough assessment of the proposed approach partly based on the challenging and realistic problem associated with the oscillating wing device. |
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| Keywords: | Low-speed preconditioning, compressible multigrid Navier-Stokes solver, energy-extracting oscillating wing, computational fluid dynamics. |
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| Place of publishing: | Maribor |
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| Publisher: | [J. Drofelnik] |
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| Year of publishing: | 2012 |
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| PID: | 20.500.12556/DKUM-36807 |
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| UDC: | 533.6.011.8(043.2) |
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| COBISS.SI-ID: | 16974614 |
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| NUK URN: | URN:SI:UM:DK:1GY2HVQH |
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| Publication date in DKUM: | 06.07.2012 |
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| Views: | 2801 |
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| Downloads: | 195 |
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| Metadata: |    |
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| Categories: | KTFMB - FS
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