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SNAME:The SNNM Semiempirical Method for the Prediction of the Added Resistance of Ships in Waves of Arbitrary Heading

Tuesday, 29th June

5:00 pm

 

SNAME Greek Section is pleased to to its final online-only meeting for the 2020-2021 season where

Apostolos Papanikolaou

Em. Professor, National Technical University of Athens, Greece

and

Shukui Liu

Lecturer, Nanyang Technological University, Singapore

will make a presentation on the topic of

The SNNM Semiempirical Method for the Prediction of the Added Resistance of Ships in Waves of Arbitrary Heading

The accurate prediction of the added resistance in waves is a classic and very complex topic of seakeeping, and the progress in the state of the art has been moderate. This subject has recently attracted increased interest due to its direct involvement in the implementation of the energy efficiency regulations, such as EEDI, which were first introduced by IMO in 2008 and require the use of a satisfactory and transparent method for the estimation of the added resistance and powering in waves under normal and extreme environmental conditions (minimum powering issue). This webinar will first briefly review available methods in the added resistance prediction, followed by a critical examination of the essential problems faced by alternative approaches. The focal point of the webinar will be the presentation of the SNNM semi-empirical method, originally developed in the SHOPERA project at NTUA, Greece and later on extended to arbitrary headings at NTU, Singapore. MARIC, China supported actively the validation of the method. An early version of the method has been discussed at IMO MEPC 70…76 as a recommended method for minimum propulsion power assessment. Recently, it also successfully passed an independent validation by the 29th ITTC SOS committee and subsequently was accepted in the ITTC procedure for correcting the effect of waves on speed/power trial results. The SNNM method requires the knowledge of only very limited hull form information, thus, it can be readily and widely applied by practicing engineers in cases, where detailed hull form is not available, as it is often the case for non newbuildings (EEXI). It is thus expected to contribute effectively to the maritime industry’s effort in reducing GHG emission following IMO’s targets.

 

Register Online

Registration will close on June 28, 2021.

A link to join the webinar will be emailed to you on June 29, 2021.

 

Questions? Contact memberservices@sname.org

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