Korean Register (KR) has released new guidelines for numerical calculation methods used to determine attained Energy Efficiency Design Index (EEDI), developed jointly with HD Hyundai Heavy Industries (HD HHI) and Samsung Heavy Industries (SHI).
The guidelines introduce a standardised methodology for Computational Fluid Dynamics (CFD)-based numerical analysis, offering an alternative to conventional physical model testing used to verify vessel energy efficiency.
The move comes as the International Maritime Organization (IMO) continues tightening emissions regulations, driving wider adoption of energy-saving technologies such as air lubrication and wind-assisted propulsion systems.
Traditionally, verifying the performance of these technologies required physical testing using scaled vessel models in towing tanks or wind tunnels, increasing both costs and development timelines.
KR said the new framework structures CFD-based EEDI calculations into three stages: qualification, validation and calibration, and main computation.
READ: KR study details safety priorities for hydrogen-fuelled ships
The guidelines also define reporting and analysis standards aimed at improving consistency and reliability.
The document includes modelling requirements and classification verification criteria for air lubrication and wind-assisted propulsion systems, areas not yet fully covered by IMO or International Association of Classification Societies (IACS) guidance.
Developed with input from HD HHI and SHI, the guidelines incorporate practical ship design and engineering data, with the aim of streamlining approval processes and reducing design lead times.
Kim Daeheon, Executive Vice President at KR, said: “Through this joint development, we have established an advanced technical standard that enables the maritime industry to proactively respond to international regulatory requirements.
“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.”
In April, KR launched Version 24 of KR-CON, its digital database of international maritime conventions.
For more information:
Korean Register – https://www.krs.co.kr/kor/
