Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 45: P10: Colloids and Complex Liquids

CPP 45.2: Poster

Wednesday, March 18, 2015, 10:00–13:00, Poster A

Dynamics of a rigid particle near a deformable interface in a viscous flow — •Abdallah Daddi-Moussa-Ider, Achim Guckenberger, and Stephan Gekle — Biofluid Simulation and Modeling, University of Bayreuth, Germany

Using computer simulations, we study the parallel motion of a rigid particle moving close to a deformable elastic membrane. We use a completed double layer boundary integral formulation to solve the Stokes equation in the limit of low Reynolds numbers. The interface deformability is treated in the linear response framework where its elastic energy is locally stored in a shear deformation and dilatation. A bending resistance has been included in order to account for the strong local curvatures. By dragging the rigid particle parallel to the elastic interface, we evaluate the drag coefficient for several distances from the surface. An elasto-hydrodynamic coupling between the flow and the wall deformation plays an important role for the particle dynamics. We find that the drag coefficient and the rotation about the axis parallel to the interface are largely dependent on the interface rigidity. We compare our numerical results for high stiffness values with the analytically exact solutions in the hard wall limit.