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research-article

A Three Steps CFD-BEM-FEM Method to Study the Influence of Green Water Impact on A Large Containership in Time Domain

[+] Author and Article Information
Kudupudi Ravindra Babu

Dept. of Ocean Engineering & Naval Architecture, IIT Kharagpur, Kharagpur, India-721302
ravindra.kudupudi@iitkgp.ac.in

Sumit Kumar Pal

Dept. of Ocean Engineering & Naval Architecture, IIT Kharagpur, Kharagpur, India-721302
sumitkpal@iitkgp.ac.in

Ranadev Datta

Dept. of Ocean Engineering & Naval Architecture, IIT Kharagpur, Kharagpur, India-721302
ranadev@naval.iitkgp.ac.in

1Corresponding author.

ASME doi:10.1115/1.4043416 History: Received December 19, 2018; Revised April 02, 2019

Abstract

The paper introduces a simplified coupled CFD-BEM-FEM based approach to study the effect green water induced loading on global structural responses such as Bending Moment, Shear Force etc. The proposed numerical scheme is based on a coupled three-step model. Initially, rigid modes of structural motions are calculated adopting a three dimensional (3D) time domain panel method without incorporating the green water loading. The time histories of the green water impact on the deck are computed using a finite volume based CFD tool with these pre-calculated rigid body motions. Finally, the problem of fluid-structure interaction is solved by considering the green water force as an external input. The direct integration scheme (i.e. Newmark - Beta method in the time domain) is employed to solve this structural problem modeled with one dimensional (1D) FEM. To check the robustness and efficacy of the proposed model and to evaluate green water effect on the structure and vice versa, a large container vessel with and without forward speed is investigated. The impact is studied with respect to motion, shear force and bending moment. The results confirm that the impact of green water and structural flexibility is significant. Therefore, these effects must be considered while designing a container ship. Also from the results, it appears that the present three-step model is an effective, efficient and useful practical tool to predict such effects.

Copyright (c) 2019 by ASME
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