Anti-inertial lift in foams: A signature of the elasticity of complex fluids

Benjamin Dollet*, Miguel Aubouy, François Graner

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

32 Citations (Scopus)


To understand the mechanics of a complex fluid such as a foam we propose a model experiment (a bidimensional flow around an obstacle) for which an external sollicitation is applied, and a local response is measured, simultaneously. We observe that an asymmetric obstacle (cambered airfoil profile) experiences a downwards lift, opposite to the lift usually known (in a different context) in aerodynamics. Correlations of velocity, deformations, and pressure fields yield a clear explanation of this inverse lift, involving the elasticity of the foam. We argue that such an inverse lift is likely common to complex fluids with elasticity.
Original languageEnglish
Article number168303
Number of pages4
JournalPhysical review letters
Issue number16
Publication statusPublished - 2005
Externally publishedYes


  • n/a OA procedure

Cite this