John K. Harvey is a Professor in Gas Dynamics at Imperial College and is a visiting Professor in the Department of Engineering at the University of Cambridge. He obtained his PhD in 1960 at Imperial College for research into the roll stability of slender delta wings which was an integral part of the Concorde development program. In the early 1960s he became involved in experimental research into rarefied hypersonic flows, initially with Professor Bogdonoff at Princeton University and subsequently back at Imperial College in London. He has published widely on the use of the Direct Simulation Mo...