Evaluation of Seakeeping Predictions

Frederick Stern; Hamid Sadat-Hosseini; Maysam Mousaviraad; Shanti Bhushan

doi:10.1007/978-94-007-7189-5_4

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Book chapter

Evaluation of Seakeeping Predictions

Frederick Stern, Hamid Sadat-Hosseini, Maysam Mousaviraad and Shanti Bhushan

Numerical Ship Hydrodynamics, pp.141-202

Springer Netherlands

10/01/2013

DOI: 10.1007/978-94-007-7189-5_4

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Abstract

Test cases related to seakeeping are studied in this chapter including heave and pitch with or without surge motion in regular head waves for KVLCC2 and KCS and wave diffraction and roll-decay with forward speed for DTMB 5415. For seakeeping, the total average error is E = 23 %D, comparable to the average error for previous seakeeping predictions. For resistance, the largest error values are for the 1st harmonic amplitude and phase (34 %D), followed by 0th harmonic amplitude (18 %D) and steady (7 %D). For motions, the largest error values are for the 0th harmonic amplitudes (54 %D), followed by 1st harmonic amplitude and phase (13 %D) and steady (9 %D). The errors for the CFD predictions are similar for the different geometries and wavelengths, the small and large amplitude waves, and for the cases with and without surge motion. The errors are larger for the cases with zero forward speed. Compared with potential flow, CFD showed larger errors for motions for the medium and long wavelengths. For wave diffraction submissions, the large grid size DES simulation has achieved an average error value of less than 10 %D, while for the small grid size URANS simulations the average error is 28 %D. For roll decay submissions, the average error values are 10 %D for resistance and less than 1 %D for roll motions.

Coarse Grid

Forward Speed

Harmonic Amplitude

Pitch Moment

Roll Motion

Details

Title: Subtitle: Evaluation of Seakeeping Predictions
Creators: Frederick Stern - University of Iowa
Hamid Sadat-Hosseini - University of Iowa
Maysam Mousaviraad - University of Iowa
Shanti Bhushan - Mississippi State University
Resource Type: Book chapter
Publication Details: Numerical Ship Hydrodynamics, pp.141-202
DOI: 10.1007/978-94-007-7189-5_4
Publisher: Springer Netherlands; Dordrecht
Language: English
Date published: 10/01/2013
Academic Unit: IIHR--Hydroscience and Engineering; Mechanical Engineering
Record Identifier: 9984201547602771

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