Parametric Study of Cavity Leading-Edge Rod Spoilers by Advanced Hybrid RANS-LES Methods
Improved delayed detached-eddy simulation is performed to explore the control mechanism of the transverse rod spoiler near the leading-edge of an open-type cavity at Ma = 0.9. The rod induces vertical velocity and lifts up the shear layer, significantly reducing the pressure fluctuation inside the cavity. Rossiter peaks are damped and energy is redistributed to the high frequency components near the cavity leading-edge. Vortex shedding after the rod generates high frequency peaks. Then three rod spoilers of different diameters and gap distances are numerically evaluated and compared. A narrow gap between the rod and the wall tends to weaken the lifting-up of the shear layer. Large rod diameter enhances the lifting-up, but also generates excessive perturbation, which is also the case for the gap distance.
Investigations presented in this paper are supported by the National Natural Science Foundation of China (Grant No. 11372159), the Key Technologies R&D Program (Grant No. 2016YFA0401200) and the EU Horizon 2020 Research & Innovation Program IMAGE. The authors wish to thank the Tsinghua National Laboratory for Information Science and Technology for providing computation resources.
- 3.Gritskevich, M.S., Garbaruk, A.V., Schütze, et al.: Development of DDES and IDDES formulations for the \(k\)-\(\omega \) shear stress transport model. Flow Turbul. Combust. 88, 431–449 (2012)Google Scholar
- 4.Henshaw, M.J.C.: M219 cavity case. Verification and validation data for computational unsteady aerodynamics. Defense Technical Information Center, ADP010729 (2000)Google Scholar
- 8.Rossiter, J.E.: Wind-tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds. Rep. Memo. No. 3438, Aeronautical Research Council (1964)Google Scholar
- 9.Saddington, A.J., Thangamani, V., Knowles, K.: Comparison of passive flow control methods for a cavity in transonic flow. J. Aircr. https://doi.org/10.2514/1.C033365 (2016)
- 11.Spalart, P.R., Deck, S., Shur, M.L., et al.: A ner version of detached-eddy simulation, resistant to ambiguous gird densities. Theor. Comput. Fluid Dyn. 20, 181–195 (2006)Google Scholar
- 12.Xiao, Z.X., Liu, J., Huang, J.B., et al.: Numerical dissipation effects on massive separation around tandem cylinders. AIAA J. 50(5), 1119–1136 (2012)Google Scholar