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Evaluation of uniform current dynamic effect in practical ship manoeuvring

Artyszuk J.

Annual of Navigation

2004

No. 8

57-66

The dynamic model of the uniform current, as introduced in the previous paper of this volume, is assessed against a bit simpler approach called semi-dynamic one. In the latter, a ship is assumed to move in still water and the over ground movement is just computed after each iteration of the differential equations integration. The level of inaccuracy caused by the semi-dynamic method depends upon the manoeuvre type. Also, some aspects of ship berthing in the ahead uniform current are raised, and compared with different degrees of simplification as employed in the shiphandling practise while dealing with the current (referred to in general as the kinematic model).

A uniform current in ship manoeuvring mathematical model

Artyszuk J.

Annual of Navigation

2004

No. 8

67-76

Some essential aspects of mathematical modelling the uniform current dynamic impact on ship manoeuvring are discussed and assessed. a simulation of a pure drift, and such a drift coupled with a turning motion is next performed for a small tanker. The one-knot current gives rise to the maximum yaw velocity of order fifteen degrees per minute associated however with a relatively long response time.