Journal article
Turn and zigzag maneuvers of a surface combatant using a URANS approach with dynamic overset grids
Journal of marine science and technology, Vol.18(2), pp.166-181
06/2013
DOI: 10.1007/s00773-012-0196-8
Abstract
Unsteady Reynolds averaged Navier–Stokes (URANS) computations of standard maneuvers are performed for a surface combatant at model and full scale. The computations are performed using CFDShip-Iowa v4, a free surface solver designed for 6DOF motions in free and semi-captive problems. Overset grids and a hierarchy of bodies allow the deflection of the rudders while the ship undergoes 6DOF motions. Two types of maneuvers are simulated: steady turn and zigzag. Simulations of steady turn at 35° rudder deflection and zigzag 20/20 maneuvers for Fr = 0.25 and 0.41 using constant RPM propulsion are benchmarked against experimental time histories of yaw, yaw rate and roll, and trajectories, and also compared against available integral variables. Differences between CFD and experiments are mostly within 10 % for both maneuvers, highly satisfactory given the degree of complexity of these computations. Simulations are performed also with waves, and with propulsion at either constant RPM or torque. 20/20 zigzag maneuvers are simulated at model and full scale for Fr = 0.41. The full scale case produces a thinner boundary layer profile compared to the model scale with different reaction times and handling needed for maneuvering. Results indicate that URANS computations of maneuvers are feasible, though issues regarding adequate modeling of propellers remain to be solved.
Details
- Title: Subtitle
- Turn and zigzag maneuvers of a surface combatant using a URANS approach with dynamic overset grids
- Creators
- Pablo Carrica - IIHR Hydroscience and Engineering The University of Iowa Iowa City IA 52242 USAFarzad Ismail - School of Aerospace Engineering Universiti Sains Malaysia 14300 Penang MalaysiaMark Hyman - Naval Surface Warfare Center Panama City Panama City FL 32407-7001 USAShanti Bhushan - Center for Advanced Vehicular Systems Mississippi State University Starkville MS 39762 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.18(2), pp.166-181
- Publisher
- Springer Japan; Japan
- DOI
- 10.1007/s00773-012-0196-8
- ISSN
- 0948-4280
- eISSN
- 1437-8213
- Language
- English
- Date published
- 06/2013
- Academic Unit
- Mechanical Engineering; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984064105502771
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