Adjoint-based design optimization using CAD parameterization through CAPRI

Within the field of computational design, there often exists a disconnect between the parametric model creation (performed in a CAD or other modeling environment) and the analysis codes used by the optimizer of the design process. In order to assure that optimization is occurring on the true surface and based on a parameterization that is applicable to the final product, an interface between the model generation and the optimization software has been created: the Computational Analysis PRogramming Interface (CAPRI¹). CAPRI is an API that allows communication with CAD software during the various stages of computational design. A framework was developed for implementing CAPRI within the SimCenter's current GEOMETRY libraries with the aim of improving geometry representation and accuracy. The framework also supports functionality to interface with a design optimization cycle by providing sensitivity derivatives and surface mesh coordinates throughout successive iterations. This provides an effective and efficient use of gradient-based optimizers. A sample wing was generated using SolidWorks² as the CAD tool with the root and tip sections defined using a NACA 2412 airfoil. Design optimization was then performed upon this model with tip rotation and wing length as adjustable parameters.