CHARACTERISATION OF A WAVY CONVECTIVE INSTABILITY IN POISEUILLE-RAYLEIGH-BENARD FLOWS: LINEAR STABILITY ANALYSIS AND NON LINEAR NUMERICAL SIMULATIONS UNDER RANDOM EXCITATIONS

摘要

The aim of the present paper is to characterize a secondary convective instability of Poiseuille-Rayleigh-Benard (PRB) mixed convection flows in air that takes the shape of wavy thermoconvective rolls, for 70≤Re≤300 and 30003Ra~*. Comparisons with the experiments by Pabiou et al. [JFM, 2005] are proposed.