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Simulation of Actual Sea Performance

Simulation of Actual Sea Performance

VESTA is a program that allows to evaluate the performance in actual seas under the input sea conditions by inputting an arbitrary sea condition (wind waves, swells, and wind speed) and specifying the number of revolutions.

Simulation Example

When simulating ship performance in actual seas for a large container ship, enter the following sea conditions and fuel indices.
Target Container Ship Main Items
Perpendicular length 300m
Ship's beam width 40m
Planned full-load draft 14m
Planned velocity 25.1knot
Maximum continuous output 59,540kW
Maximum number of containers loaded 6500TEU

We give the following oceanographic conditions and fuel indexes as input data.

Significant wave height (wind wave, swell), average wind speed

Main wave direction (wind wave, swell), wind direction

Fuel index


When the specified rotation speed is 88 rpm, the following results can be obtained.

RPM (Ne) and Fuel Index (FI)

The sea is rough, the fuel index reaches its limit, and the RPMs decreases.

Speed

A large speed reduction occurs with a decrease in RPM.

Fuel consumption (FPD: per day, FPM: per nautical mile)

Due to the decrease RPM, the fuel consumption per day decreases. However, since ship speed also decreases, fuel consumption per mile increases.