**Editor: Jitesh S. B. Gajjar **

This Theme Issue of *Philosophical Transactions A* contains contributions from eminent applied mathematicians and fluid dynamicists on various topics including the latest developments in stability and transition of channel and boundary-layer flows, separation in laminar and turbulent boundary-layer flows, flow past bluff bodies, body impacts. The issue is specially dedicated to Professor Frank T. Smith FRS on the occasion of his 65th birthday. There are 14 contributed papers presenting original research, or reviews of areas which have been greatly influenced by Professor Smith's seminal research contributions in the last 45 years.

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