Dr. Rabi Mehta, Experimental Fluid Dynamics I am a research scientist in the Fluid Mechanics Laboratory at NASA Ames Research Center. My background is in experimental research of fluid flows as applied to the field of aeronautics --- this subject is popularly known as aerodynamics. I did all my schooling in England. My undergraduate degree was in aeronautical engineering after which I went to graduate school at Imperial College in London where I specialized in fluid mechanics with emphasis on turbulence (yes, the same stuff you often experience on airplanes). I loved sports from the time I started elementary school in Nairobi, Kenya (Kenya lies on the east coast of Africa). Since Kenya was a British Colony at the time, we were mainly exposed to British sports such as soccer, and my favorite, cricket. I played cricket all through high school and college and at one time I wanted to become a professional cricket player in England. However, I was smart enough to listen to my father's advice and I decided to educate myself instead. I was lucky enough to be able to play cricket even out here in California. While at graduate school, I decided to apply my knowledge of aerodynamics to cricket and I wrote an article on the "Aerodynamics of a Cricket Balls" which received extensive publicity amongst the cricketing countries. As a follow on, during my last couple of years at Imperial College, we started an experimental project on cricket ball aerodynamics. Basically, we wanted to study how a cricket ball curves through the air (much like a curve ball in baseball) and what parameters can affect its flight. We conducted flow visualization studies and measured surface pressures and aerodynamic forces by projecting spinning cricket balls into a wind tunnel. That is how I got started in this exciting field. After I moved to California, I also looked at the aerodynamics of baseballs and golf balls. I consult regularly with golf companies on various issues regarding golf ball and golf club aerodynamics. I am familiar with all kinds of sports balls and their aerodynamics and I have written several articles on the subject. Currently, I am writing a book on "The Aerodynamics of a Cricket Ball" and I have a prototype design of a cricket ball which is being tested in England. The unique feature of my design is that the ball can be made to swing quite easily and hence the name: "Happy Swinger". As one of the team members on the Aerodynamics in Sports project, I will help the other researchers determine what information can be obtained from different wind tunnels, how the wind tunnel test should be conducted and how to interpret that data. We will be looking at different methods to simulate the spin of the ball in the wind tunnel and how the "fuzz" on the tennis ball effects its flight. It will be interesting to see how tennis balls differ or are similar to other sports balls.
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