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The model of ideal fluid flow around a cylindrical obstacle exhibits along-established physical picture where originally straight streamlines will bedeflected over the whole space by the obstacle. As inspired by transformationoptics and metamaterials, recent theories have proposed the concept of fluidcloaking able to recover the straight streamlines as if the obstacle does notexist. However, such a cloak, similar to all previoustransformation-optics-based devices, relies on complex metamaterials, beingdifficult to implement. Here we deploy the theory of scattering cancellationand report on the experimental realization of a fluid-flow cloak withoutmetamaterials. This cloak is realized by engineering the geometry of the fluidchannel, which effectively cancels the dipole-like scattering of the obstacle.The cloaking effect is demonstrated via direct observation of the recoveredstraight streamlines in the fluid flow with injected dyes. Our work sheds newlight on conventional fluid control and may find applications in microfluidicdevices.

A metamaterial-free fluid-flow cloak