Journal article
Self-propulsion computations using a speed controller and a discretized propeller with dynamic overset grids
Journal of marine science and technology, Vol.15(4), pp.316-330
12/2010
DOI: 10.1007/s00773-010-0098-6
Abstract
A method that can be used to perform self-propulsion computations of surface ships is presented. The propeller is gridded as an overset object with a rotational velocity that is imposed by a speed controller, which finds the self-propulsion point when the ship reaches the target Froude number in a single transient computation. Dynamic overset grids are used to allow different dynamic groups to move independently, including the hull and appendages, the propeller, and the background (where the far-field boundary conditions are imposed). Predicted integral quantities include propeller rotational speed, propeller forces, and ship’s attitude, along with the complete flow field. The fluid flow is solved by employing a single-phase level set approach to model the free surface, along with a blended k−ω/k−ɛ based DES model for turbulence. Three ship hulls are evaluated: the single-propeller KVLCC1 tanker appended with a rudder, the twin propeller fully appended surface combatant model DTMB 5613, and the KCS container ship without a rudder, and the results are compared with experimental data obtained at the model scale. In the case of KCS, a more complete comparison with propulsion data is performed. It is shown that direct computation of self-propelled ships is feasible, and though very resource intensive, it provides a tool for obtaining vast flow detail.
Details
- Title: Subtitle
- Self-propulsion computations using a speed controller and a discretized propeller with dynamic overset grids
- Creators
- Pablo Carrica - IIHR-Hydroscience and Engineering The University of Iowa Iowa City IA 52242 USAAlejandro Castro - IIHR-Hydroscience and Engineering The University of Iowa Iowa City IA 52242 USAFrederick Stern - IIHR-Hydroscience and Engineering The University of Iowa Iowa City IA 52242 USA
- Resource Type
- Journal article
- Publication Details
- Journal of marine science and technology, Vol.15(4), pp.316-330
- Publisher
- Springer Japan; Japan
- DOI
- 10.1007/s00773-010-0098-6
- ISSN
- 0948-4280
- eISSN
- 1437-8213
- Language
- English
- Date published
- 12/2010
- Academic Unit
- Mechanical Engineering; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984064591102771
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