In this course the numerical code series Phoenics (Cham) and Fluent (Fluent) are used to study a layer of fluid between horizontal parallels walls maintained at different temperatures (Free convection, Rayleigh-Benard instability). After having define the problem to be solved (choise of the equations, of the models, of the boundary conditions and of the initial conditions), we determine the critical Rayleigh's number above which stationnary convective rolls appear. We analyse the dynamical and thermal behavior of the convective structures at the onset of motion. Numerical results are compared to theoretical results obtained from linear stability analysis.
Projets by group :