Abstract
The optimal control of noise emitted by a 2D plane jet and first results for 3D plane jets are presented. The so-called adjoint-equations provide sensitivity information used in a gradient-based minimization of aerodynamic sound even for high dimensional control problems. The goal is to reduce the noise in the farfield of a plane jet by applying cooling and heating in small control volumes located in the jet shear layers. The farfield-sound was directly calculated by solving the compressible Navier-Stokes-equations and non-reflecting boundary conditions for the adjoint-equations were derived and implemented along with sponge zones to minimize reflections. Using optimal control a sound pressure level (SPL) reduction of up to 7dB could be reached. Furthermore 3D DNS results indicate large differences in the size and coherence of structures in the adjoint field.
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Marinc, D., Foysi, H. (2013). Optimal Control of a Plane Jet Using the Adjoint Method. In: Dillmann, A., Heller, G., Kreplin, HP., Nitsche, W., Peltzer, I. (eds) New Results in Numerical and Experimental Fluid Mechanics VIII. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 121. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35680-3_19
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DOI: https://doi.org/10.1007/978-3-642-35680-3_19
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