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Alejandro Bilbao

Soft Matter and Complex Fluids


Research




Hydrodynamics of undulatory locomotion


Low Reynolds number undulatory swimmer C. elegans exhibits surprisingly complex behavior despite its simple neural system. C. elegans is able to
propel itself and navigate towards sources of food in a variety of environments, including thin fluid layers. In this study, the body of the animal
is modeled as a long chain of hydrodynamically interacting spheres which has been shown to faithfully represent the behaviour of submerged fiber-like
objects. Using highly accurate hydrodynamic models, the locomotion and navigation of the nematode is fully described.

A sample simulation video may be downloaded HERE. (Theora video compression)




Jamming of constricted particulate systems


Rich dynamic behaviors exist in Brownian particulate systems flowing through an abrupt constriction. Simulations reveal that the flow is directly related to
the driving force as well as geometrical constraints of the system. In addition, events of jamming/unjamming and formation of crystalline structures occur
intermittently for certain channel configurations.

A simulation video may be downloaded HERE. (Theora video compression)




Colloidal suspensions


Colloidal particles under confinement subjected to external Stokes flow may exhibit non-linear time irreversible behaviors. Simulations show that in the presence of parallel walls spheres displaced by shear flow produce swapping motions in periodic systems.

A simulation video may be downloaded HERE. (Theora video compression)


 

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