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Recent Developments on 3D Instabilities for Rotating Boundary Layer Flows

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In this talk we summarise some recent developments on the instability of boundary layer flow over rotating bodies. While the rotating disk is widely acknowledged as a key test case to investigate the crossflow instability, recent theoretical and experimental studies have successfully identified the more dangerous centrifugal instability, which is present for a rotating cone. We add further complexity to this problem by investigating the effect of isotropic and anisotropic roughness models for the rotating disk and, more recently, the rotating cone. The results suggest a complex interaction between competing instability mechanisms and potentially interesting implications for the design of spinning turbomachinery.

This talk is part of the Waves Group (DAMTP) series.

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