A Multi-Method Solver for Flow Around Ships

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Authors
  1. Hally, D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
One of the primary goals of the Ship Noise Group at DREA is to reduce cavitation noise on Canadian Forces ships. Reduction in cavitation is achieved by improving propeller designs which in turn requires an accurate prediction of the flow into the propeller. This flow is incompressible, has very high Reynolds number (approximately 10E9 based on ship length), can have complex geometry if propeller shafts, brackets, rudders, etc. are included, and has a free surface. Moreover, it is unlikely that the flow near the stern can be modelled adequately if wall functions are used. Consequently, solvers for this application have high memory requirements due to the large number of nodes needed. For the past few years DREA has been developing a multi-method solver for this application; it is called TRANSOM. This paper is a progress report for the TRANSOM project. TRANSOM's design allows for a multi-block hybrid grid having different flow solvers on each block: a finite-difference pseudo-compressibility method on structured blocks (called SPC for structured pseudo-compressibility); and a finite element (FE) method on unstructured blocks. However, the implementation of the coupling across block interfaces on hybrid grids is not yet complete, so that currently either a fully structures or unstructured grid must be used.
Keywords
Computer programs (TRANSOM);Pseudo compressible flow;Reynolds-Averaged Navier-Stokes Equations;SPC (Structured Pseudo-Compressibility);Hybrid grids;Multi-method solver
Report Number
DREA-SL-1999-049 — Paper
Date of publication
01 May 1999
Number of Pages
8
DSTKIM No
CA001412
CANDIS No
513116
Format(s):
Hardcopy;Document Image stored on Optical Disk

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