Open Water Squat Predictions for HALIFAX, KINGSTON and ORCA Classes

PDF

Authors
  1. McTaggart, K.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
This report presents predictions of squat for the HALIFAX, KINGSTON and ORCA classes in shallow water. Squat is the physical phenomenon of a ship at speed being attracted toward the ocean bottom, possibly resulting in grounding. A potential flow panel method was developed for predicting hydrodynamic forces in shallow water and the associated change in ship position. The method provides squat predictions over most operational speeds, with the exception of transcritical flow conditions having water depth Froude numbers ranging from approximately 0.8 to 1.2. Presented results of bottom clearance as a function of ship speed can provide guidance to ship operators for determining safe ship speeds in given water depths. The results are given for ships in unconfined waters. If ships are expected to travel in confined waters, such as canals, then additional computations should be performed using the developed method, which already has the capability to model canal walls.

Il y a un résumé en français ici.

Keywords
heave;pitch;potential flow;ship;squat;trim
Report Number
DRDC-RDDC-2017-R075 — Scientific Report
Date of publication
01 Apr 2017
Number of Pages
44
DSTKIM No
CA045121
CANDIS No
805507
Format(s):
Electronic Document(PDF)

Permanent link

Document 1 of 1

Date modified: