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Materials with periodic architectures exhibit many beneficial characteristicssuch as high specific stiffness thanks to the material placement along thestress paths and the nano-scale strength amplification achieved through the useof hierarchical architectures. Recently, the porosity of architecturedmaterials was leveraged to increase the efficiency of compact heat exchangers,and their internal aerodynamics was studied. However, their performance onexternal aerodynamics applications is generally assumed to be detrimental.Here, we demonstrate that exposing 3D lattice material to the external flowreduced the drag of a circular cylinder when placed at carefully selectedangular locations. We tested two configurations with the lattice materialinstalled at the windward and leeward regions. On the one hand, the windwardconfiguration showed a strong Re dependency, with a drag reduction of up to 45%at Re=11E4. On the other hand, the lattice material in the leeward regionreduced the drag by 25% with weak Re dependency. Alterations of the latticematerial topology had a noticeable effect on the drag reduction in both cases.Adding aerodynamic features to the already proven beneficial structuralproperties of 3D lattice materials might aid in the development of low-poweredautomotive, naval, and aerospace vehicles.

Drag Reduction of a Circular Cylinder Through the Use of an Architectured Lattice Material