Numerical study of the natural convection of Boussinesq equations in parallelepipedal cavities with isothermal walls and heated from two sides: influence of walls conditions

摘要

The authors present a enw calcualtion code using a two-dimensional finite-element method valid in permanent and laminar flow. They consider elements of symmetry existing in boundary conditions imposed on velocities as well as on temepratures, then elements of symmetry existing only in boundary conditions imposed on velocities and, finally, boundary conditions containing no symmetry. The flow is tow-cellular so that the Rayleigh number remains inferior to a value in the order of 10~6. Beyond this value, secondary cells can appear, following the geometry of the enclosure.