Large-Eddy Simulations of Synthetic Jets in Stagnant Surroundings and Turbulent Cross-Flow
Large-Eddy Simulations (LES) are used to investigate the physical processes involved in the injection of a synthetic (zero-net-flux) jet into a zero-pressure-gradient turbulent boundary layer at conditions corresponding to experimental data obtained by others. The boundary layer ahead of the jet is generated by a separate precursor simulation at a momentum-thickness Reynolds number of Re θ=920, providing the main simulation with a full and accurate description of the unsteady conditions. Phase-averaged results and time-averaged integral quantities are presented and compared against experimental data. This main study is preceded by a simulation of a synthetic-jet injected into stagnant surroundings, mainly in order to verify the computational framework, but also to gain insight into the behaviour of the vortex rings injected through a square orifice, in accord with corresponding experimental conditions.
Key wordsFlow control synthetic jets turbulent boundary layer LES
Unable to display preview. Download preview PDF.
- 2.Garcillan, L., Little, S., Zhong, S., Wood N.J.: Time evolution of the interaction of synthetic jets with a turbulent boundary layer. CEAS/KATnet Conference on Key Aerodynamic Technologies. Bremen, Germany (2005).Google Scholar
- 5.Rumsey, C.L., Manceau, R., Gatski, T.B.: Flow over 2-D wall mounted hump using URANS. In Proceedings of 12th ERCOFTAC/IAHR Workshop on Refined Turbulence modelling (2006).Google Scholar
- 8.Garcillan, L., Zhong, S., Pokusevski, Z., Wood, N.J.: A PIV study of synthetic jets with different orifice shape and orientation. AIAA Paper 2004-2213 (2004).Google Scholar