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2016 | OriginalPaper | Chapter

Numerical Modeling of Wind Tunnel Walls for the Investigation of Oscillating Airfoils

Authors : Christoph Kaiser, Jens Nitzsche

Published in: New Results in Numerical and Experimental Fluid Mechanics X

Publisher: Springer International Publishing

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Abstract

The numerical modeling of airfoil oscillations in wind tunnels is investigated on the basis of frequency response functions of the flow field due to a forced motion input employing unsteady RANS simulations. The analyzed models reasonably predict the unsteady wind-tunnel wall effects, including the acoustic wind tunnel resonance. For high frequencies, however, the model shows significant spurious fluctuations related to non-physical reflections at the outflow boundary. Therefore, both increasing the distance to the computational boundaries and a nominally less-reflective boundary condition according to Hedstrom (1979, J. Comput. Phys. 30:222–237) are examined leading to slightly improved results.

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Title: Numerical Modeling of Wind Tunnel Walls for the Investigation of Oscillating Airfoils
Authors: Christoph Kaiser
Jens Nitzsche
Publisher: Springer International Publishing
Book: New Results in Numerical and Experimental Fluid Mechanics X
Print ISBN: 978-3-319-27278-8

Electronic ISBN: 978-3-319-27279-5

Copyright Year: 2016
DOI: https://doi.org/10.1007/978-3-319-27279-5_40

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