Drag reduction in turbulent boundary layers by in-plane wall motion

What is it about?

This is a rather short, plainly-written review of recent research in the field of turbulent skin-friction drag reduction, with special emphasis on open-loop predetermined techniques, and full details on their subset based on spanwise forcing.

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Why is it important?

The style of the review makes it suited to the non-specialist reader, that gets introduced to the field through an historical approach. The most significant steps of our progresses in the last decades are mentioned, before focusing on recent developments. A critical outlook is offered in the concluding section to describe the author's view of how the filed will likely evolve in the future.