Second-Order Seakeeping Analyses using Perturbators. Issue 1 (January 2014)

• Record Type: Journal Article
• Authors: Söding, Heinrich
• Is Part Of: Ship technology research. Volume 61:Issue 1(2014)
• Page Start: 4
• Page End: 15
• Publication Date: 2014-01
• Subjects: Potential Flow -- Numerical Solution -- Nonlinear; Shipbuilding -- Periodicals; 623.82072
• DOI: 10.1179/str.2014.61.1.001
• Languages: English
• ISSNs: 0937-7255

Abstract

Abstract : Perturbation methods up to first order are common in seakeeping predictions. For higher than first order, lengthy theoretical analyses are retired; they result in complicated formulae requiring high programming effort, and often the well-established numerical methods for first-order quantities fail when applied to second-order flow quantities. Both the derivation of the required expressions and their programming can be simplified substantially by using mathematical entities called perturbators. Here the concept of perturbators is described, and their application is demonstrated for a two-dimensional test problem: the force and moment up to second order acting on a fixed, partly immersed cylindrical body in a regular wave.