Divya Tyagi, right, a Penn State engineering graduate student, shows her work on a century-old math problem to Sven Schmitz, a College of Engineering faculty member and Tyagi's adviser. Credit: Kevin Sliman. All Rights Reserved.UNIVERSITY PARK, Pa. — A Penn State engineering student refined a century-old math problem into a simpler, more elegant form, making it easier to use and explore. Divya Tyagi’s work expands research in aerodynamics, unlocking new possibilities in wind turbine design that ...