Improvement of Vertical Motion Prediction for the Ship Model Resistance Test using Dynamic Mesh

Abstract

The study is to use OpenFOAM for computational fluid dynamics (CFD) analysis Static and dynamic grid were used Static grid is only used to predict ship hull resistance and dynamic grid is used to predict ship hull resistance trim and sinkage The nominal wake profile and ship wave pattern were observed The trim and sinkage are very small values so for their prediction the large error was obtained by using experiment data (such as mass and center of gravity) Through numerical discretization process and when the grid attached to the hull surface it caused slight deviation between the ship geometries used in CFD simulation and the original IGS file Furthermore ship model initial motion and rotation center would be changed In the end these reasons cause large error The study provides the solution of this situation by a XCG (Center of gravity in x direction) correction process The results of trim and sinkage value were significantly improved

Date of Award	2020
Original language	English
Supervisor	Ping-Chen Wu (Supervisor)