Application of the Design of Experiments and Computational Fluid Dynamics to Bow Design Improvement

Woochan Seok,Jeonghwa Seo,Shin Hyung Rhee,Gwan Hoon Kim

doi:10.3390/jmse7070226

Abstract

Techniques of the design of experiments (DOE) and computational fluid dynamics (CFD) were applied for improving the bow shape of a tanker hull. Through this, a hull that could reduce the added resistance in waves was derived. The key design elements of the bow shape were selected as parameters for design optimization and added resistance in the short-wavelength region was interpreted through CFD considering the operational condition of the full scale ship. For design parameter changes, the number of analyses was minimized by applying DOE. The regression equation for calculating added resistance was derived using bow-shape design parameters by applying the response surface method and regression analysis to obtain the optimal hull with minimal added resistance was derived. The methodology was applied to an Aframax tanker hull form, and the derived added resistance regression equation and the added resistance value obtained through CFD analysis showed a difference of approximately 1%. The model test results of the improved hull form showed that the added resistance was reduced by 52% in comparison to that obtained for the original hull form.

Highlights

With the increased global interests in eco-friendliness, the Energy Efficiency Design Index (EEDI) adopted by the International Maritime Organization (IMO) in 2013 regulates greenhouse gas (GHG) emission of maritime industries
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Summary

Introduction

With the increased global interests in eco-friendliness, the Energy Efficiency Design Index (EEDI) adopted by the International Maritime Organization (IMO) in 2013 regulates greenhouse gas (GHG) emission of maritime industries. Kim et al [5] conducted CFD analysis on the added resistance of a very large crude oil carrier (VLCC) in waves and verified the effects on the energy-saving device through comparison with the model test results. The present study attempted to find main hull form parameters and correlations between them, which is a prerequisite for hull form optimization to reduce added resistance in waves In this process, the design of experiments (DOE) was applied to systematically and effectively perform CFD analyses. DOE was applied to the optimization process of bow shapes to reduce the added resistance in waves.

Optimization Methods

Design Parameter Variation

Computational Method

Bow Shape Optimization

Findings

Design Parameters