CAD-free hydrodynamic optimisation using consistent kernel-based sensitivity filtering. Issue 3 (October 2015)

• Record Type: Journal Article
• Authors: Kröger, J.; Rung, T.
• Is Part Of: Ship technology research. Volume 62:Issue 3(2015)
• Page Start: 111
• Page End: 130
• Publication Date: 2015-10
• Subjects: CAD-free shape optimisation -- Adjoint sensitivity computation -- Kernel-based vectorial filtering -- Ship hydrodynamics -- Navier-Stokes simulations -- Wake quality; Shipbuilding -- Periodicals; 623.82072
• DOI: 10.1080/09377255.2015.1109872
• Languages: English
• ISSNs: 0937-7255

Abstract

Abstract : This paper advocates the benefits of consistent kernel-based filter functions dedicated to the filtering of shape sensitivities obtained from CAD-free adjoint hydrodynamic shape optimisation procedures. Emphasis is given to explicit corrections of truncated Gaussian filters in discrete space subjected to first-order consistency constraints. The nature of the approach supports an irregular distribution of surface-mesh points without modifying the shape sensitivity influences. The methodology facilitates an apparently simple explicit Lagrangian surface parameterisation at a moderate computational surplus. Results indicate benefits of a consistent approach as regards the conservation of surface-mesh properties and the approach towards optima. Examples indicate the practical impact for aftship and wake-equalising duct examples. Accordingly, designs that feature large (local) deformations of the initial shape can be examined during a few hours of turn-around time using a single tool rather than a tool chain.