PSU Mark
Eberly College of Science Mathematics Department

Meeting Details

For more information about this meeting, contact Becky Halpenny.

Title:"A force dipole model for semidilute bacterial suspensions"
Seminar:Ph.D. Oral Comprehensive Examination
Speaker:Shawn Ryan, Adviser: Leonid Berlyand
Abstract Link:http://
Abstract:
We present results on suspensions of self-propelled bacteria where hydrodynamic interactions between particles are taken into account. Bacteria are modeled as point force dipoles subject to two types of interactions: hydrodynamic interactions and excluded volume type interactions introduced through the use of the Lennard-Jones potential. The alignment of asymmetrical particles and the presence of self-propulsion gives rise to a drastic reduction in the effective viscosity of the suspension. An explicit asymptotic formula for the effective viscosity in terms of known physical parameters is derived using a kinetic approach. This model allows for numerical simulations of a large number of particles, which are in agreement with the analytical results and experiment through a full range of concentrations. Current work involves understanding the onset of collective motion in the above model by investigation of the correlation of bacterial velocities and orientations as a function of the interparticle distance. This work is part of a doctoral thesis under the direction of Professor Leonid Berlyand.

Room Reservation Information

Room Number:203 EE West
Date:01 / 10 / 2012
Time:11:00am - 01:00pm