Hydrodynamics of wind-assisted ship propulsion validation of RANS-CFD methodology

Nico van der Kolk, Lex Keuning, Rene Huijsmans

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

A Reynolds-Averaged Navier Stokes computational fluid dynamics (RANS-CFD) package will be one of the primary tools used during the development of a performance prediction program for Wind-Assisted commercial ships. The modelling challenge presented by large separated flow structures in the wake of the sailing ship points to a conscientious validation study. A validation data set, consisting of hydrodynamic forces acting on the ship sailing with a leeway angle, was collected at the Delft University of Technology towing tank facility, for bare-hull and appended cases. Four hull geometries were selected to represent of the Delft Wind-Assist Systematic Series. Appended cases were designed to represent a broad range of appendage topologies: Rudder, Bilge-keels, Skeg, and Barkeel. The direct validation exercise for the bare-hull case was successful, with the validation level for the sideforce equal to 9.5% (fine mesh: 9M cells). An extended validation statement is made for simulations for the entire series. This exercise was successful for leeway angles equal to 훽훽=[3표표,6표표]. The validation level (base mesh, 3M cells) for each force component is:푢푢푋푋′=12%, 푢푢푌푌′=17%, 푢푢푁푁′=10%. The validation for appended geometries was not regarded as successful, with the exception of the Rudder case. The numerical uncertainty is the dominant contribution for the validation level, motivating a proportionate refinement of the grid. Here, it is sufficient to achieve parity with other contributions to the uncertainty within the larger context of the project.
Original languageEnglish
Title of host publicationProceedings of the 4th International Conference on Innovation in High Performance Sailing Yachts (INNOVSAIL 2017)
EditorsPatrick Bot
PublisherSailing Yard Research Foundation (SYRF)
Pages207-216
Publication statusPublished - 2017
EventINNOVSAIL 2017: 4th International Conference on Innovation in High Performance Sailing Yachts - Lorient, France
Duration: 28 Jun 201730 Jun 2017

Conference

ConferenceINNOVSAIL 2017: 4th International Conference on Innovation in High Performance Sailing Yachts
CountryFrance
CityLorient
Period28/06/1730/06/17

Keywords

  • computational fluid dynamics
  • hydrodynamic lift
  • hydrodynamics
  • Reynolds-Averaged Navier-Stokes (RANS)
  • wind loads

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