Abstract: Several phenomena in the physical and the life sciences can be modeled as a time dependent interface problem and nonlinear partial differential equations. Examples include the study of electro-osmotic flows, molecular beam Epitaxy, free surface flows and multiphase flows in porous media. One of the main difficulties in solving numerically these equations stems from the fact that the geometry of the problems is often arbitrary and special care is needed to correctly apply boundary conditions. Another difficulty is associated with the fact that such problems involve dissimilar length scales, with smaller scales influencing larger ones so that nontrivial pattern formation dynamics can be expected to occur at all intermediate scales. Uniform grids are limited in their ability to resolve small scales and are in such situations extremely inefficient in terms of memory storage and CPU requirements. In this talk, I will present recent advances in the numerical treatment of interface problem and describe new numerical solvers for nonlinear partial differential equations in the context of adaptive mesh refinement based on Octree grids. If time permits, I will also present an accurate method for accurately simulating fluid-solid two-way coupling.
Bio: Frédéric Gibou's research is focused on the design and the applications of new high resolution multiscale computational algorithms for a variety of applications including materials science, multiphase flows at the micro/nanoscale, computer vision with an emphasis on the segmentation of medical images and computer graphics. For further details on Prof. Gibou'a work please see his personal website here.