Numerical Simulations of the Flow Dynamics Past an Oscillating Rod-Airfoil Configuration
The rod-airfoil subjected to a forced oscillation was numerically studied using the Improved Delayed Detached Eddy Simulation (IDDES) method. The freestream flow Mach number is 0.21 and Reynolds number based on the rod diameter is 48000. The transversely oscillating motion of the rod-airfoil changes the flow properties dramatically, compared to the stationary case. The shear layers become unstable earlier and the formation length is shortened, although the oscillating case has less small-scale structures. The oscillation enhances the lift fluctuations sharply and changes the phase relationships of lift between the rod and the airfoil. The relationships between the time history of lift coefficients and the evolutions of instantaneous flow fields are also explored.
The investigations presented in this paper were supported by the National Natural Science Foundation of China (Grant No. 11372159), the National Key Technologies R&D Program of China (Grant No. 2016YFA0401200) and the European Union’s Horizon 2020 research and innovation program (Grant No 688971).
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