I will describe experiments using soap films and soap bubbles to illustrate the interest of these common objects to some fluid mechanics problems. The flow in the very thin layer of these films is basically two dimensional and this property brings fundamental differences with fluid flows in three dimensions as well as experimental simplification. I will use three examples for this talk: the measurement of viscous drag in turbulent soap film channels, the interaction between a flow and different structures in fast flowing soap films, and thermal convection in soap bubbles. In all these cases, the two dimensional nature of the flow allows to capture some of the key features of the underlying dynamics such as the role of the structure of the turbulence on the scaling of the viscous drag in the first case, a symmetry breaking mechanism leading to locomotion of passive objects in the second case, and the appearance of large scale vortices in the last case.
Accès Salle des séminaires FAST-LPTMS (Bât. 530, salle C.120, 1er)