Fluid-structure interaction

Propulsion of micro-organism is induced by the motion of appendices like cilia or flagella whose motion in the surrounding flow generates the propulsive forces. At these small scales, the fluid dynamics is dominated by viscous forces a regime quantified by low Reynolds numbers. Fluid-structure interaction describes situations where a deformable object is  deformed and/or transported by a flow. The presence of the object will perturb the flow and this coupling is non trivial. Many theoretical and numerical works have been developed these past years to understand these phenomena but only few experimental studies have been carrie out mainly due to the lack of controlled experimental systems. During the past years we studied different model situations where the properties of both the objects (mainly size and elasticity) and the flow are well-controlled.

  • Experimental Collaborations: Anke Lindner (PMMH, ESPCI), Howard Stone (Princeton University, USA), Al Crosby (UMass, USA)
  • Numerical/theoretical Collaborations: Michael Shelley (NYU, USA), David Saintillan (UCSD, USA)

You will find illustrations of the different situations we have studied so far. More info by clicking on the images!!

 

Anchored micro-helices deformed by a flow

Anchored micro-helices deformed by a flow

 

Flexible filament freely evolving in an array of stagnation points

Flexible filament freely evolving in an array of stagnation points

Photopolymerized fiber deformed by increasing flow rates.

Photopolymerized fiber deformed by increasing flow rates.

 

 

 

 

 

 

 

 

 

 

 

link to Fluid-structure Interaction webpage at PMMH.