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International audienceLa transition vers la turbulence en conduite cylindrique est observée pour Re assez grand, malgre la stabilité linéaire de l'état laminaire. Expérimentalement, la transition se manifeste par le développement de bouffées turbulentes, spatialement localisées. Du côté théorique, des ondes progressives, instables et de courte longueur d'onde, ont été mises en évidence numériquement. Cette étude, qui utilise la simulation numérique directe ainsi qu'un modèle réduit, suggère la compatibilité entre les deux approches. [Edge states and slugs in cylindrical pipe flow. Transition to turbulence in cylindrical pipe flow is observed for large enough values of Re, despite the linear stability of the laminar base flow. Experimentally, transition occurs through the growth of localised structures like puffs or slugs. On a more theoretical side, unstable travelling waves with a short wavelength have been computed numerically. This investigation, based on both between direct numerical simulation and a reduced order model, suggests compatibility between the two approaches.

États limites et bouffées turbulentes en conduite cylindrique