kvlcc2

Determining the EEDI “minimum propulsion power”, new paper

Recently, SSPA’s experts in seakeeping and ship performance in waves presented a new paper at an international conference, held by RINA (the Royal Institution of Naval Architects). A concise version of the presented paper and the results is available for download.

The introduction of EEDI (the Energy Efficiency Design Index) almost a decade ago, slow steaming and the wish to reduce bunkering costs have resulted in a trend to install less powerful engines in ships. To avoid vessels becoming underpowered and unsafe, IMO (the International Maritime Organization) published an interim guideline. SSPA used the KVLCC2 tanker as a case study and followed the guideline step by step to find the minimum engine size. Our experts used a combination of CFD (Computational Fluid Dynamics) and model tests. 

The paper was presented by Frederik Gerhardt, PhD, during the conference “Influence of EEDI on Ship Design & Operation”. Held online 27th May 2020 by the Royal Institution of Naval Architects www.rina.org.uk/EEDI_2020

- “Results show that it is particularly important to determine the added resistance in waves correctly because it dominates the power prediction. Carefully conducted tests in SSPA’s large seakeeping basin are a good way to do this. From the investigation also becomes clear, that the selection of the ‘propulsive’ factors, particularly the thrust deduction factor t, has a significant influence on results”, says Dr Frederik Gerhardt, Senior Technical Specialist for seakeeping and ship performance in waves at SSPA.

About the paper

Title: Determining the EEDI “minimum propulsion power”
Authors: F. C. Gerhardt, M. Kjellberg, B. Korkmaz, K. Ljungqvist and A. Shiri, SSPA Sweden AB, Sweden.

Download

A concise version of the presented paper is available for download:
Determining the EEDI minimum propulsion power.pdf

Full paper incl. additional tables and figures available from: publications@rina.org.uk

About the authors

Frederik Gerhardt is the Senior Technical Specialist for seakeeping and ship performance in waves at SSPA Sweden AB. He is responsible for model tests in SSPA’s Maritime Dynamics Laboratory and is a member of the ITTC Seakeeping Committee. 
Martin Kjellberg holds the position of Specialist in seakeeping and ship performance in waves at SSPA Sweden AB and is the main developer of SHIPFLOW MOTIONS at Flowtech International AB. 
Burak Korkmaz is a specialist in hydrodynamic predictions and CFD at SSPA Sweden AB. He currently studies towards a PhD at Chalmers University of Technology. 
Kasper Ljungqvist holds a position as Project Manager at SSPA Sweden AB. His main focus areas are calm water towing tank tests and hull form development. 
Alex Shiri is Senior Researcher and Project manager at SSPA Sweden AB. His main focus is developing combined CFD and EFD methods for marine applications.

Photo

SSPA used the KVLCC2 tanker as a case study and followed the guideline step by step to find the minimum engine size. Our experts used a combination of CFD and model tests.