Formation of Large-Amplitude Wave Groups in an Experimental Model Basin
Abstract
Experiments were performed to develop the capability to generate groups of large-amplitude waves in irregular seas in a model basin. Secondary objectives included demonstrating the ability to generate single extreme waves and also the application of experimental measurement techniques to produce point and wave-field topology data. The process was intended to be deterministic in nature, such that a large wave group or single large wave will occur in the model basin at a predictable and repeatable location and time. Proving the feasibility of generating asymmetric large-amplitude wave groups in an experimental basin is the first step in the development of an experimental test technique that ensures a model will be exposed to multiple realistic extreme wave events during a test run. This technique will remove the "randomness" associated with model experiments in irregular waves from the process to evaluate ship performance in severe sea conditions. It will also reduce time in the basin and more accurately represent a full-scale seaway where ship may be at risk. To investigate the feasibility of producing grouped extreme waves in an experimental basin, experiments were conducted in August and November 2007 in the Maneuvering and Seakeeping (MASK) basin at the Naval Surface Warfare Center, Carderock Division (NSWCCD). The first experiment (Phase I) consisted of producing several combinations of finite regular waves with varying parameters, including amplitude, frequency, and signal duration. Superposition of these finite regular waves produced repeatable wave groups at a specific location in the MASK. The second experiment (Phase II) consisted of two parts. The first part applied the wave-packet method to produce single large-amplitude waves, based on the technique developed by Clauss and Bergmann (1986) and Clauss and Kuehnlein (1994, 1995).
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2008
- Accession Number
- ADA493240
Entities
People
- Christopher C. Bassler
- Gerritt E. Lang
- Jason B. Carneal
- Joel T. Park
- Martin J. Dipper Jr.
- Sang S. Lee
Organizations
- Naval Surface Warfare Center Carderock Division