Abstract
Progress toward developing a closed loop control of flow around an airfoil with a Coanda flap is presented. Two loop components were addressed and analysed for the reference no-blowing case: the estimator and its input signal. For the estimator, a Proper Orthogonal Decomposition (POD) Galerkin model based on unsteady Reynolds averaged Navier-Stocks (uRANS) data was evaluated. To compensate for the unresolved dissipative scales in uRANS and for truncation error, the POD Galerkin model was calibrated by introducing an eddy viscosity term. The calibrated POD Galerkin model succeeded in replicating the time coefficients of the first two modes but failed to replicate the higher modes. The sensor location over the flap was optimized using modified Linear Stochastic Estimation (mLSE). With an optimal sensor placement it was possible to determine the state of the flow more accurately than for the same number of evenly spaced sensors.
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References
Pfingsten KC, Radespiel R (2009) Experimental and numerical investigations of a circulation control airfoil. In: 47th AIAA aerospace science meeting, Orlando.
Bergmann M, Cordier L, Brancher JP (2005) Optimal rotary control of the cylinder wake using proper orthogonal decomposition reduced-order model. Phys Fluids 17:097101
Mokhasi P, Rempfer D (2004) Optimized sensor placement for urban flow measurement. Phys Fluids 16(5)
Stalnov O, Palei V, Fono I, Cohen K, Seifert A (2007) Experimental estimation of a D-shaped cylinder wake using body-mounted sensors. Exp fluids 42(4):531–542
Noack BR, Afanasiev K, Morzynski M, Tadmor G, Thiele F (2003) A hierarchy of low-dimensional models for the transient and post-transient cylinder wake. J Fluid Mech 497:335–363 (Cambridge University Press).
Sirovich L (1987) Turbulence and the dynamics of coherent structures. Q Appl Math Vil XLV(3):561–590.
Cordier L, Abou El Majd B, Favier J (2010) Calibration of POD reduced order models using Tikonov regularization. Int J Numer Methods Fluids 63:269–296
Ausseur J (2007) Application of low-dimensional techniques for closed-loop-control of turbulent flows. Ph.D. dissertation, Department of Mechanical and Aerospace Engineering. Syracuse University, Syracuse, NY.
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© 2015 Springer International Publishing Switzerland
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El Sayed Mohamed, Y., Semaan, R. (2015). Progress Toward Closed Loop Control of a Flow Around an Airfoil with Coanda Blowing. In: Theofilis, V., Soria, J. (eds) Instability and Control of Massively Separated Flows. Fluid Mechanics and Its Applications, vol 107. Springer, Cham. https://doi.org/10.1007/978-3-319-06260-0_10
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DOI: https://doi.org/10.1007/978-3-319-06260-0_10
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