LAUSR

Significance Throughout the past several decades, research on metamaterials has been highly active. Metamaterials are artificial materials with amazing properties such as invisibility, field rotation, and concentration. Typically, these unique functions are achieved by the special design of material structures and one function corresponds to one specific design. As a result, a multifunctional metamaterial has never been realized. Here, we experimentally realize a multifunctional hydrodynamic metamaterial for fluid flow in a porous medium. Our system integrates the functions of the cloak, concentrator, and rotator, and achieves a continuous adjustment in both the magnitude and direction of flow with negligible disturbance to the background. Our study brings advancement to the theoretical design and the practical application of multifunctional metamaterial.