Control effect of porous mesh on aerodynamic noise of large-scale landing gear

A porous wire mesh is employed to investigate flow control and noise reduction in landing gear. The numerical simulation is based on the improved delayed detached-eddy simulation method and the Ffowcs Williams–Hawkings equation. Aerodynamic noise prediction is first conducted for the baseline landing gear model, and the applicability of the porous wire mesh boundary condition is validated. Subsequently, two types of porous mesh structures are applied for noise reduction, both achieving significant noise suppression. Building on this, a parametric study on porosity is performed. It is found that when porosity is small, the flow characteristics resemble those of a solid fairing, with dominant noise originating from the wake region of the porous mesh; when porosity is large, the flow field approaches the baseline configuration, with noise dominated by interference between different landing gear components. The moderate porosity of 0.45 is identified as the optimal porosity. Both noise sources are effectively suppressed, yielding the maximum far-field noise reduction. Regarding aerodynamic forces, while the solid fairing significantly increases drag, the porous meshes mitigate this additional drag. The findings provide a theoretical basis for landing gear noise reduction design.