Korean Register (KR) has published its new Numerical Calculation Guidelines for the Determination of the Attained EEDI, developed through a joint research initiative with HD Hyundai Heavy Industries (HD HHI) and Samsung Heavy Industries (SHI).
The guidelines establish a standardised methodology for numerical analysis based on Computational Fluid Dynamics (CFD), providing an alternative to conventional physical model testing for verifying Energy Efficiency Design Index (EEDI) performance.
Demonstrating the performance of energy-saving technologies to improve efficiency and reduce carbon emissions, such as air lubrication and wind-assisted propulsion systems, has typically required physical model testing using scaled vessel models in towing tanks or wind tunnels.
CFD-based computer simulations can calculate the flow of water and air around a hull as an alternative, with differences in simulation settings creating variations in results. The newly published guidelines standardise the procedure for determining the EEDI reference speed using CFD-based numerical calculations across three stages: qualification, validation and calibration, and main computation.
The guidelines also define analysis methodologies and reporting standards to ensure the reproducibility of results.
“Through this joint development, we have established an advanced technical standard that enables the maritime industry to proactively respond to international regulatory requirements,” said Kim Daeheon, Executive Vice President at KR.
“We will continue to expand our technical support to strengthen the shipbuilding industry’s digital engineering capabilities and lead the market for environmentally friendly vessels.”
The guidelines include specific modelling requirements and verification criteria for evaluating the performance of air lubrication and wind-assisted propulsion systems, areas that have not yet been fully addressed in the guidelines of either the IMO or the International Association of Classification Societies (IACS).
