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http://dx.doi.org/10.1016/j.ijnaoe.2016.04.001

Strongly coupled partitioned six degree-of-freedom rigid body motion solver with Aitken's dynamic under-relaxation  

Chow, Jeng Hei (DHI Water & Environment (S) Pte Ltd.)
Ng, E.Y.K. (School of Mechanical and Aerospace Engineering, Nanyang Technological University)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.8, no.4, 2016 , pp. 320-329 More about this Journal
Abstract
An implicit method of solving the six degree-of-freedom rigid body motion equations based on the second order Adams-Bashforth-Moulten method was utilised as an improvement over the leapfrog scheme by making modifications to the rigid body motion solver libraries directly. The implementation will depend on predictor-corrector steps still residing within the hybrid Pressure Implicit with Splitting of Operators - Semi-Implicit Method for Pressure Linked Equations (PIMPLE) outer corrector loops to ensure strong coupling between fluid and motion. Aitken's under-relaxation is also introduced in this study to optimise the convergence rate and stability of the coupled solver. The resulting coupled solver ran on a free floating object tutorial test case when converged matches the original solver. It further allows a varying 70%-80% reduction in simulation times compared using a fixed under-relaxation to achieve the required stability.
Keywords
CFD; OpenFOAM; Strongly coupled; Motion response; Wave loads; Dynamic under-relaxation;
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