期刊
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
卷 15, 期 4, 页码 316-330出版社
SPRINGER JAPAN KK
DOI: 10.1007/s00773-010-0098-6
关键词
Self-propulsion; CFD; Ship motions; Overset grids; Propellers; Free surface
资金
- US Office of Naval Research [N00014-01-1-0073, N00014-06-1-0474]
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-omega/k-E > 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.
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