The behaviour of a mud-water interface underneath a slowly advancing ship at small keel clearance
Ferdinande, V.; Vantorre, M. (1991). The behaviour of a mud-water interface underneath a slowly advancing ship at small keel clearance, in: Proceedings of the International Symposium on Hydro- and Aerodynamics in Marine Engineering HADMAR '91, Varna, Bulgaria, 28 October - 1 November 1991. pp. [4-1]-[4-10]
In: (1991). Proceedings of the International Symposium on Hydro- and Aerodynamics in Marine Engineering HADMAR '91, Varna, Bulgaria, 28 October - 1 November 1991. Bulgarian Ship Hydrodynamics Centre: Varna. 2 vol. pp., meer
A mud layer on the sea bottom is simulated by a fluid layer of a certain thickness and density. A mixture of trichlorethane and petroleum seems to be the most appropriate fluid which can be used to simulate the water-mud interface. Model experiments on a slowly advancing ship at small keel clearance revealed the existence of a hydraulic jump in the two-fluids interface, clearly pointing to a well-defined physical pattern. In order to explain, and to describe this phenomenon, that influences the resistance, sinkage, performance and, more important in practice, the manoeuvrability of the ship, some theoretical considerations are presented. It appears that a simplified approach, notwithstanding crude approximations, based on the continuity principle and on an application of Bernoulli's equation to the two fluids layer problem, describes rather closely the main trends observed in the occurrence of the hydrodynamic phenomenon with varying parameters. Even the occurrence of steering anomalies observed above muddy bottoms can be explained.
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