Journal article
Assessment of URANS surface effect ship models for calm water and head waves
Applied ocean research, Vol.67, pp.248-262
09/2017
DOI: 10.1016/j.apor.2017.07.013
Abstract
•Surface effect ship (SES) air cushion pressure and seal models are implemented in URANS hydrodynamics solver.•Verification and validation for T-Craft calm water resistance, impulsive heave and pitch decay, and wave-induced motions in head waves.•The experimental trends are predicted well and errors are mostly comparable to those for displacement and semi- and planing hulls.
Surface effect ship (SES) air cushion and seal models are implemented in an URANS hydrodynamics solver. The air cushion is modeled either as a prescribed pressure patch, or as a compressible isothermal/adiabatic ideal stagnant air with fan and leakage flows. The seals are either discretized as hinged bodies or modeled as 2D planing surfaces with hydrodynamic interaction. Verification and validation studies are performed using T-Craft experimental data for calm water resistance, sinkage and trim at Froude number (Fr)=0.1–0.6; impulsive heave and pitch decay at Fr=0; and wave-induced resistance and motion predictions in head waves at Fr=0 and 0.6. The compressible air cushion model with fan and leakage flows perform better than those without the fan and leakage flows and the prescribed pressure patch model. The hinged seal model performs better than the 2D planing surface model, but is computationally expensive for time accurate simulations. Therefore, the 2D planing surface model is used for the validation studies. SES simulations on grids with 5.3M cells show grid verification intervals of 6%, which are comparable to those reported for displacement and semi-planing hull studies on similar grid sizes. On an average calm water and impulsive motion predictions compare within 8.5% of the experimental data, and wave-induced motion predictions show somewhat larger error of 13.5%. The errors levels are mostly comparable to those for displacement and semi-planing and planing hulls. The study identifies that most critical advancement needed for SES simulations is the seal modeling including fluid structure interaction.
Details
- Title: Subtitle
- Assessment of URANS surface effect ship models for calm water and head waves
- Creators
- Shanti Bhushan - Mississippi State UniversityMaysam Mousaviraad - University of IowaFrederick Stern - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Applied ocean research, Vol.67, pp.248-262
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.apor.2017.07.013
- ISSN
- 0141-1187
- eISSN
- 1879-1549
- Grant note
- name: Ms. Kelly Cooper, award: N00014-10-1-0499
- Language
- English
- Date published
- 09/2017
- Academic Unit
- Mechanical Engineering; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984195060502771
Metrics
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