CAD-Based Parameterization for Adjoint Optimization

Manipulating CAD geometry using primitive components rather than the originating software is typically a challenging prospect. The parameterisation used to define the geometry of a model is often integral to the efficiency of the design. Even more crucial are the relations (constraints) between those parameters that do not allow the model to be under-defined. However, access to these parameters is lost when making the CAD model portable. Importing a standard CAD file gives access to the Boundary Representation (BRep) of the model and consequently its boundary surfaces which are usually trimmed patches. Therefore, in order to connect Adjoint optimization and Computational Fluid Dynamics to the industrial design framework (CAD) in a generic manner, the BRep must be used as a starting point to produce volume meshes and as a means of changing a model’s shape. In this study, emphasis is given firstly, to meshing (triangulation) of a BRep model as a precursor to volume meshing and secondly, to the use of techniques similar to Free Form Deformation for changing the model’s shape.