Journal article
Unsteady RANS method for surface ship boundary layer and wake and wave field
International journal for numerical methods in fluids, Vol.37(4), pp.445-478
2001
DOI: 10.1002/fld.183
Abstract
Results are reported of an unsteady Reynolds-averaged Navier–Stokes (RANS) method for simulation of the boundary layer and wake and wave field for a surface ship advancing in regular head waves, but restrained from body motions. Second-order finite differences are used for both spatial and temporal discretization and a Poisson equation projection method is used for velocity–pressure coupling. The exact kinematic free-surface boundary condition is solved for the free-surface elevation using a body-fitted/free-surface conforming grid updated in each time step. The simulations are for the model problem of a Wigley hull advancing in calm water and in regular head waves. Verification and validation procedures are followed, which include careful consideration of both simulation and experimental uncertainties. The steady flow results are comparable to other steady RANS methods in predicting resistance, boundary layer and wake, and free-surface effects. The unsteady flow results cover a wide range of Froude number, wavelength, and amplitude for which first harmonic amplitude and phase force and moment experimental data are available for validation along with frequency domain, linear potential flow results for comparisons. The present results, which include the effects of turbulent flow and non-linear interactions, are in good agreement with the data and overall show better capability than the potential flow results. The physics of the unsteady boundary layer and wake and wave field response are explained with regard to frequency of encounter and seakeeping theory. The results of the present study suggest applicability for additional complexities such as practical ship geometry, ship motion, and maneuvering in arbitrary ambient waves.
Details
- Title: Subtitle
- Unsteady RANS method for surface ship boundary layer and wake and wave field
- Creators
- Shin Hyung Rhee - Iowa Institute of Hydraulic Research, Department of Mechanical Engineering, University of Iowa, Iowa City, IA, United StatesFred STERN - Iowa Institute of Hydraulic Research, Department of Mechanical Engineering, University of Iowa, Iowa City, IA, United States
- Resource Type
- Journal article
- Publication Details
- International journal for numerical methods in fluids, Vol.37(4), pp.445-478
- Publisher
- Wiley; Chichester
- DOI
- 10.1002/fld.183
- ISSN
- 0271-2091
- eISSN
- 1097-0363
- Language
- English
- Date published
- 2001
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984064240002771
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