DNS of turbulent mixing layers with variable density etc15 Tracking Number 485Presentation: Session: Reacting and compressible flows 2 Room: Room F Session start: 10:30 Thu 27 Aug 2015 Antonio Almagro aalmagro@ing.uc3m.es Affifliation: Universidad Carlos III de Madrid Oscar Flores oflores@ing.uc3m.es Affifliation: Universidad Carlos III de Madrid Manuel García-Villalba mgarciav@ing.uc3m.es Affifliation: Universidad Carlos III de Madrid Topics: - Reacting and compressible turbulence, - Transport and mixing, - Jets and wakes Abstract: We present some preliminary results of direct numerical simulations of three-dimensional, temporal, plane mixing layers with variable density. The simulations are run with a parallel in-house code that solves the Navier-Stokes equations in the Low-Mach number approximation, using a novel algorithm based on an extended version of the velocity-vorticity formulation used by Kim, Moin & Moser (1987) for incompressible flows. The simulations are run with Pr=0.7 and achieve Re_lambda=90-110 during the self-similar evolution of the mixing layer. Four cases with density ratios s=1,2,4 and 8 are presented. Our results show good agreement with previous experimental and numerical studies, and allow us to characterize the scales in the temperature spectra. |