Anzeige
Erschienen in:
2011 | OriginalPaper | Buchkapitel
8. Shallow Water Ship Hydrodynamics
verfasst von : A. J. Hermans
Erschienen in: Water Waves and Ship Hydrodynamics
Verlag: Springer Netherlands
Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
Abstract
In this chapter we consider slender ships in shallow water; we discuss three related topics. We are, among others, interested in the influence of the bottom on the vertical motion of the ship. It turns out that a ship in shallow water experiences a certain sinkage and trim due to the bottom effect. This is of importance if one wishes to determine the required depth of harbours in such a way that a ship may enter safely. It is also of importance to know the wall effects for ships travelling in a shallow channel. Here we wish to know sinkage and trim but also the force and moment due to the interaction of the walls of the channel. The third topic we shall consider is the interaction among ships.
The topics have been investigated by E.O. Tuck (J. Fluid Mech. 26: 81–95, 1966), R.F. Beck (J. Ship Res. 2, 1977) and R.W. Yeung (Proc. Sympos. Aspects of Navigability, 1978 and J. Fluid Mech. 85:143–159, 1978). The first two are steady flow problems, while the third one is unsteady due to the difference in forward speed of the two ships. The method we use to solve these problems is related to the well-known method of matched asymptotic expansions. To obtain insight into this method, we apply it to the unsteady flow around a two-dimensional airfoil, where the introduction of the inner expansion is not commonly done. The incoming flow is in principle nearly parallel to the airfoil while the fluid domain is extended toward infinity. Thereafter, we treat the case of a crosscurrent flow around a slender body wedged between two parallel plates. The notion blockage will be introduced in this way. After the preliminary investigations, we shall pay attention to the three problems mentioned above.