Dynamic large eddy simulation of surging airfoils with moderate to large streamwise oscillations

Authors
Kocher, Alexander W.
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Other Contributors
Sahni, Onkar
Gandhi, Farhan
Oberai, Assad
Issue Date
2017-05
Keywords
Aeronautical engineering
Degree
MS
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
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Abstract
A dynamic large eddy simulation (LES) based numerical investigation is carried out for flow over two surging airfoils with moderate to large streamwise oscillations. In each case, the airfoil is set at a fixed angle of attack and is subjected to a sinusoidal surging motion (i.e., in the streamwise direction). The amplitude of oscillation is characterized by the advance ratio of the blade section, which is defined by the ratio of the maximum relative velocity in excess of the mean relative velocity, or the freestream velocity, to the mean relative velocity. The relative airfoil velocity is defined with respect to the ambient fluid. In this study, the amplitude of the sinusoidal oscillations is varied within a moderate and high range. For the moderate range, a NACA 0018 airfoil at a mean Reynolds number of 300,000 and 4° angle of attack is considered. Two advance ratios of 0.34 and 0.51 are considered to match with the experiments of Strangfeld et al.. For the high range, a NACA 0012 airfoil at a mean Reynolds number of 40,000 and 6° angle of attack is considered at three advance ratios of 0.8, 1.0 and 1.2 to compare with the experiments of Granlund et al.. These cases span a range of operating conditions, including a reversed flow condition.
Description
May 2017
School of Engineering
Department
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
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