Introduction of MMG standard method for ship maneuvering predictions

Abstract

A lot of simulation methods based on Maneuvering Modeling Group (MMG) model for ship maneuvering have been presented. Many simulation methods sometimes harm the adaptability of hydrodynamic force data for the maneuvering simulations since one method may be not applicable to other method in general. To avoid this, basic part of the method should be common. Under such a background, research committee on ''standardization of mathematical model for ship maneuvering predictions'' was organized by the Japan Society of Naval Architects and Ocean Engineers and proposed a prototype of maneuvering prediction method for ships, called ''MMG standard method''. In this article, the MMG standard method is introduced. The MMG standard method is composed of 4 elements; maneuvering simulation model, procedure of the required captive model tests to capture the hydrodynamic force characteristics, analysis method for determining the hydrodynamic force coefficients for maneuvering simulations, and prediction method for maneuvering motions of a ship in fullscale. KVLCC2 tanker is selected as a sample ship and the captive mode test results are presented with a process of the data analysis. Using the hydrodynamic force coefficients presented, maneuvering simulations are carried out for KVLCC2 model and the fullscale ship for validation of the method. The present method can roughly capture the maneuvering motions and is useful for the maneuvering predictions in fullscale.

Broaching probability for a ship in irregular stern-quartering waves: theoretical prediction and experimental validation

“…The used propulsion and maneuvering models are based on conventional methods such the Maneuvering Modeling Group (MMG) model [51], but adapted for twin propellers and twin rudders and their emersion [33]. To allow readers to reproduce the results, all models and the system parameters used are provided here.…”

Predictions of ship maneuverability based on virtual captive model tests

“…simulating the captive model tests with a Reynolds-averaged Navier-Stokes (RANS)-based solver, and then predicts the standard maneuvers using the mathematical models with the obtained hydrodynamic coefficients. Two classic types of mathematical models -the Abkowitz model (Abkowitz, 1964) and the Maneuvering Modeling Group (MMG) model (Yasukawa & Yoshimura, 2015) -for predicting ship maneuverability are generally adopted. More and more researchers are trying to use CFD methods for predicting the hydrodynamic derivatives.…”

Effect of Engine Output on Maneuverability of a VLCC in Still Water and Adverse Weather Conditions

“…Additionally, small engine output leads to a low propeller load and thereby reduces the rudder force. Therefore, an excessive reduction in the engine output will result in a potentially unexpected unsafe situation wherein a helms man may not be able to maneuver the ship well in adverse weather conditions [1,2].…”

“…This study examined a situation in which the engine output of a VLCC was reduced due to the progress of the energy-saving and used an MMG-based maneuvering simulation method [1] to investigate the maneuverability of the VLCC in still water and adverse weather conditions. It may be noted that the prediction accuracy of the simulation method was sufficient for practical use [1,9].…”