Abstract
The interaction of a turbulent boundary layer with a compliant surface is studied experimentally in a rotating disk geometry. A hydroelastic instability, in the form of a wave structure in the compliant surface-liquid interface, develops when the quotient (free stream fluid velocity) × (square root of the liquid density)/(square root of the shear modulus of the compliant material) exceeds a critical value. Below this critical condition surface compliance does not affect the flow in any measurable way, whereas above it the skin-friction drag is significantly increased. Explanations for these observations are offered on the basis of photographic and visual studies of the wave structure and a theoretical treatment of the interaction of an inviscid fluid with a compliant surface.
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