Fluid Mechanics Seminar: Ahmad Zareei

Transformation Optics (aka transformation media) offers an unprecedented method of manipulating a variety of waves through architecting the propagation medium. The necessary condition for a wave to be controllable by this method is that its governing equation must be form-invariant under coordinate transformation. Maxwell's equations for electromagnetic waves is an examples of such systems. In transformation optics, the coordinate transformation is translated into material properties, which are usually anisotropic and spatially varying. These constitutive parameters of materials could be approximated using artificial (meta)materials. Idea of Transformation Optics with analogy could be applied in other areas of science such as water waves, acoustic waves, elastodynamic waves or even seismic waves, in order to design new materials to steer and control these waves. New devices can be designed using this method to concentrate, scatter or rotate waves or even cloak a region of space from these waves. In this talk, I will cover an introduction to transformation media methods and how we used this method to cloak a region from incoming waves in the shallow water and how we have extended this method for the waves in finite and infinite depth. I will also discuss a way of extending this method for those systems with non-forminvariant governing equations.

Bio: Ahmad Zareei is a Ph.D. candidate at the University of California, Berkeley in the Department of Mechanical Engineering studying under the supervision of Professor Reza Alam. His current research interests are in theoretical and applied fluid dynamics, dynamical systems and geophysical fluid dynamics. Previously, he completed bachelors in Mechanical Engineering and Physics at Sharif University followed by a masters in Mechanical Engineering at UCB.