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The goal of this Multi-University Research Initiative is to establish the field of fluid-metamaterial interaction (FMI) that will discover new fluid-structure couplings between innovative materials and critical aerodynamic flows. We specifically seek to fundamentally understand how distinct classes of mechanical metamaterials interact with dynamics of dominant flow structures in turbulent flows, and understand how these interactions are affected by porosity and surface texture. The long-term goal is to meaningfully design bespoke aircraft (sub)surfaces with mechanical metamaterials for dynamic passive flow control, to revolutionize air vehicle performance.