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Description
Broadband acoustic analysis and design of realistic computer-aided design (CAD) geometries are challenging due to the non-affine frequency dependence of the Boundary element method. When combined with isogeometric analysis (IGABEM), exact CAD geometry representation, high accuracy, and relaxed mesh requirements are offered. However, the use of spline-based basis functions increases the computational cost per degree of freedom, making analyses and iterative design loops computationally demanding. In that context, this work presents an efficient IGABEM-based framework that enables broadband acoustic shape exploration by combining IGABEM with a non-intrusive two-step model order reduction (MOR) strategy. The frequency-dependent boundary element system is approximated and reduced using Krylov-subspace recycling MOR and reduced basis method, allowing fast evaluation of acoustic responses over wide frequency ranges. Shape variations are performed directly at the CAD level by modifying NURBS control points supported by a topological ring-based smoothing strategy to ensure smooth and robust geometry updates. The methodology is demonstrated on an academic example, a multi-patch non-conforming flat plate subjected to broadband acoustic excitation. The result shows that geometry smoothing leads to more natural shape variations, while the reduced-order model makes acoustic evaluations computationally feasible.