Dynamics and influence of the buoyancy frequency in unstably stratified homogeneous turbulence etc15 Tracking Number 123Presentation: Session: Instability and Transition 1 Room: Room B Session start: 10:30 Tue 25 Aug 2015 Alan Burlot alan.burlot@ec-lyon.fr Affifliation: CEA - Ecole centrale de Lyon Benoit-Joseph Gréa benoit-joseph.grea@cea.fr Affifliation: CEA Fabien Godeferd fabien.godeferd@ec-lyon.fr Affifliation: Ecole centrale de Lyon Claude Cambon claude.cambon@ec-lyon.fr Affifliation: Ecole centrale de Lyon Topics: - Transport and mixing, - Instability and transition Abstract: We investigate unstably stratified homogeneous turbulence through direct numerical simulation and a spectral model based on a eddy-damped quasi-normal Markovian closure. In this study, we take into account and evaluate the importance of an unsteady buoyancy frequency expressing the evolution of a mixing zone submitted to Rayleigh-Taylor instability. |