Broadside Current Forces on Moored Ships

by William N. Seelig, Naval Facilities Engineering Command, Washington, United States,
David Kriebel, Naval Facilities Engineering Command, Washington, United States,
John Headland, Naval Facilities Engineering Command, Washington, United States,



Document Type: Proceeding Paper

Part of: Civil Engineering in the Oceans V

Abstract:

A method of estimating the static lateral current force on ships in deep and finite depth water is presented for the case of the current broadside to the ship. The method is based on recent scale model studies conducted, together with re-analysis of data for a wide variety of vessels modeled over the past five decades at a number of laboratories. In the method a deepwater drag coefficient is determined from ship properties. The shallow water limiting drag coefficient is determined as a function of current velocity squared. Drag coefficients for a vessel in finite depth water are then determined from a power law interpolation. A key finding is that channel blockage biases results from most laboratory studies.

Subject Headings: Ship motion | Drag (fluid dynamics) | Scale models | Lateral forces | Mooring | Laboratory tests | Ships

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