Abstract
Synthetic jet actuators (SJAs) are popular active-flow control devices. Hence, they have been widely investigated through computational fluid dynamics (CFD) simulations and experiments. Although such simulations are faster, cheaper, and more popular than experiments, the simulation results of similar geometries often differ from one another. A reason for the differences between CFD results is the simplification of CFD models. To determine the influence level of SJA simplifications on the aerodynamics of an airfoil under a separated condition, this study compares the most complicated assumption for SJA simulation with the simplest one. A NACA 0015 airfoil is simulated at an angle of attack of 16.6° and a Reynolds number of 896000. Two different methods are applied to simulate SJA, namely, morphing mesh (MM) technique for piston movement and oscillatory inlet velocity (OIV) at the jet-exit location. Results reveal that the mean lift value of the MM case is only 3% less than that of the OIV case. However, the drag forces of MM case are approximately 15% higher than those of the OIV case. In addition, the vortex structures in the OIV case are smaller than those in the MM case. Finally, the cycle-averaged streamlines of the two models are similar near the trailing edge, but they differ in the vicinity of the SJA exit location.
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This paper was presented at the 10th ACFD, Jeju, Korea, October 2014. Recommended by Guest Editor Hyoung-Gwon Choi
Nahmkeon Hur is a Professor in the Department of Mechanical Engineering of Sogang University in Seoul, Korea and a director of Multi-phenomena CFD Engineering Research Center (ERC) funded by National Research Foundation of Korea. He received his Ph.D. from Stevens Institute of Technology in 1988. His research interests include multiphysics and multi-dynamics CFD and their industrial applications. He served as the president of Korean Society of Mechanical Engineers (KSME) in 2014.
Mohammad Moshfeghi received his B.Sc. and M.Sc. in Aerospace Engineering from Tehran Polytechnic in 2002 and 2005. He holds a Ph.D. about flow control over wind turbine blades from Xi’an Jiaotong University in 2013. He is currently a Research Professor at Multi-phenomena CFD Engineering Research Center (ERC) at Sogang University in Seoul, Korea.
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Moshfeghi, M., Hur, N. Effects of SJA boundary conditions on predicting the aerodynamic behavior of NACA 0015 airfoil in separated condition. J Mech Sci Technol 29, 1829–1836 (2015). https://doi.org/10.1007/s12206-015-0403-8
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DOI: https://doi.org/10.1007/s12206-015-0403-8