Towards Multidisciplinary Adjoint Optimization of Turbomachinery Components

The current state-of-the-art adjoint design optimizations for turbomachinery components focus solely on aerodynamic cost functions and constraints, yet disregard structural feasibility during the optimization procedure. This paper presents the first steps taken towards including structural constraints in a multidisiplinary adjoint optimization design chain for turbomachinery components. Particularly in turbomachinery, deformations arise due to centrifugal and pressure load during running conditions, which lead to a coupled fluid-structure interaction problem. While most optimization methods treat the fluid and structure domains separately in
a single-disciplinary fashion, we seek to directly include the coupled fluid-structure interaction within the adjoint optimization. To this end, a cold-to-hot transformation tool that deforms a CAD geometry based on FEM displacements is implemented and differentiated using adjoint algorithmic differentiation to compute the required transformation sensitivities.