Prof. Nadarajah is an expert in the area of aerodynamic shape optimization of complex systems subjected to forces exerted by both steady and unsteady fluid flow. In the past two years, the thrust of his research work has been devoted to new algorithms to both compute and redesign turbo-machinery, helicopter, and wind turbine blades to improve the efficiency. His approach utilizes the nonlinear frequency-domain (NLFD) technique for the rapid simulation of the flow field and an adjoint-based approach for the rapid redesign of the blades and currently stands as the fastest technique without sacrificing the accuracy of the flow solution. His group’s current research efforts have focused on the development of an implicit NLFD spectral-difference scheme to achieve high-order accurate solutions for unsteady flows, advancement of the NLFD approach by both developing an adaptive time step and overset mesh capability for the algorithm, the formulation of the adjoint equations for viscous dominated flows, and the development of algorithms to optimize turbine blades to minimize the film coolant mass flow rate and to reduce the thermal load on the blade surface while maintaining the total pressure loss. His group also carries out research on the investigation both static and dynamic stall as well as evolution of the tip vortex using a detached-eddy simulation (DES) technique.