Modeling Nonlinear Wave-Induced Loads on a Submerged Body
Abstract
The wave-induced linear loads on a submerged underwater vehicle are well understood for canonical shapes. An analytical solution even exists for arbitrary body-of-revolution shapes. Wave-induced nonlinear loads, on the other hand, are not nearly as well predicted. Assuming inviscid flow, complicated potential functions provide solutions for the nonlinear loads but require large computer resources to solve. This thesis investigates wave-induced nonlinear loads on a fully submerged cylindrical body in a wave field consisting of two superimposed regular waves. A dynamic verification of a load cell was first performed to ensure that the small loads could be accurately measured. The load cell dynamic measurement error was calculated at less than 8 percent. Then, through experimental measurements, the study empirically developed a contour map of these nonlinear loads. These loads are presented as functions of the wave height and wavelength of each of the two underlying waves. By covering a large parameter space of wavelengths and looking at two different wave heights, this thesis created contour maps of the nonlinear loads at a fine wavelength resolution and demonstrated how to collapse the nonlinear loads for any wave height. These contour maps can be used during the design process with model-based systems engineering tools for predicting the loads on an underwater vehicle to ensure it meets maneuvering and stability requirements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2022
- Accession Number
- AD1213726
Entities
People
- Mehmet Bahadir
Organizations
- Naval Postgraduate School