SCALE INTERACTION IN A MIXING LAYER. THE ROLE OF THE LARGE-SCALE GRADIENTS. etc15 Tracking Number 263Presentation: Session: Vortex Dynamics 3 Room: Room B Session start: 10:30 Wed 26 Aug 2015 Daniele Fiscaletti d.fiscaletti@tudelft.nl Affifliation: Lab. for Aero & Hydrodinamics, Department of Mechanical Engineering, Delft University of Technology, Leeghwaterstraat 21 2628 CA Delft, The Netherlands Antonio Attili antonio.attili@kaust.edu.sa Affifliation: Clean Combustion Research Center King Abdullah University of Science and Technology, Saudi Arabia Fabrizio Bisetti fabrizio.bisetti@kaust.edu.sa Affifliation: Clean Combustion Research Center King Abdullah University of Science and Technology, Saudi Arabia Gerrit Elsinga g.e.elsinga@tudelft.nl Affifliation: Lab. for Aero & Hydrodinamics, Department of Mechanical Engineering, Delft University of Technology, Leeghwaterstraat 21 2628 CA Delft, The Netherlands Topics: - Vortex dynamics and structure formation Abstract: The interaction between scales is investigated in a turbulent mixing layer. The large-scale amplitude modulation of the small scales already observed in other works depends on the crosswise location. Large-scale positive fluctuations correlate with a stronger activity of the small scales on the low speed-side of the mixing layer, and a reduced activity on the high speed-side. However, from physical considerations we would expect the scales to interact in a qualitatively similar way within the flow and across different turbulent flows. Therefore, instead of the large-scale fluctuations, the large-scale gradients modulation of the small scales has been additionally investigated. |