Calculation of Streamlines on the USNS VANGUARD.
Abstract
Computer calculations were made of the paths of streamlines on the hull of the USNS VANGUARD (TAGM-19). The calculations were made by using a potential flow computer program which accounts for free surface effects. Computer runs were made for ship speeds of 0, 5, 20, and 30 knots, where the 0-knot speed corresponds to the double model case where the free surface is treated as a plane symmetry. Numerous computer-generated figures of the ship lines and streamlines for the 0-, 5-, and 10-knot cases are presented. The results are also summarized in tabular form. For a streamline passing through a fixed point on the bottom of the hull at Frame 143, the axial location of a proposed acoustic receiver array, the results show that the closest approach of the streamline to the actual free surface monotonically increases with increasing speed. Thus, the 0-speed case represents the most conservative estimate. The results also show that streamlines located 7.5 feet (2.3 m) outboard of the vertical plane of symmetry, the outreach of the proposed receiver array, approach no closer than 11 feet (3.4 m) to the free surface in the bow region for the 0-, 5-, and 10-knot cases. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1979
- Accession Number
- ADA074934
Entities
People
- David W Taylor
- H. T. Wang
- J. Libby