Lectures on Hydroelasticity
Introduction
Welcome to this video lecture series on linear hydroelasticity of ocean structures. These videos have evolved out of a series of lectures on linear hydroelasticity that Prof. Riggs gave at an International PhD Summer School in Ocean Engineering, July 14-21, 2019 in Harbin, China. Hydroelasticity is multi-disciplinary, in that it requires sophistication both in finite element modeling of structures as well as in hydrodynamics. Therefore, basics in each area are covered. Feel free to skip those videos that cover areas in which you are well-versed and listen to the ones that fill in gaps in your knowledge. A summary of each video is provided to help you decide whether to watch a given video or to skip it.
Note: Each "Video" link is to a video hosted on YouTube. The "Alternate" link is to the same video on a Chinese hosting site.
Video – 2 min 27 sec – Alternate
Overview and Scope
Video covers the scope of the video series. Explains what hydroelasticity is, the components of it, and example applications. Recommended for all users.
Video – 13 min 20 sec – Alternate
Basic Concepts in Naval Architecture
Video covers basic concepts for floating rigid structures, such as buoyancy and stability, center of buoyancy, cernter of gravity, coordinate systems, rigid body modes, and hydrostatic stiffness. All for rigid bodies, as a necessary introduction to hydroelasticity.
Video – 18 min 12 sec – Alternate
Structural Dynamics and Structural Analysis
These videos cover basics of structural dynamics and structural analysis, with an emphasis on topics of particular importance for hydroelasticity. Video 1 covers the dynamics of single degree-of-freedom systems. Video 2 covers structural analysis via the finite element method. Video 3 returns to dynamics of multi-degree-of-freedom structures.
Video 1 – 32 min 23 sec – Alternate
Video 2 – 23 min 48 sec – Alternate
Video 3 – 11 min 50 sec – Alternate
Potential Flow Theory
Linear potential flow theory is the fluid model most widely used in linear hydroelasticity. Prof. Masud Hayatdavoodi from the University of Dundee in Scotland and Harbin University reviews the basics of linear potential flow theory.
Equations of Linear Hydroelasticity
Brings together the fundamental equations governing linear hydroelasticity. Topics include the equations of motion, reduced basis, and obtaining the response.
Video - 20 min 56 sec. – Alternate
Modeling
Video discusses issues in modeling through examples: JOMAE barge, ISSC benchmark, OTEC cold water pipe, and mobile offshore base.
Video – 33 min 03 sec – Alternate
Detailed Hydroelastic Analysis Example – The OMAE Barge
One of the benchmark problems presented in the paper Riggs, H. R., Niimi, K. M., and Huang, L. L. (2007), “Two benchmark problems for three-dimensional, linear hydroelasticity,” Journal of Offshore Mechanics and Arctic Engineering, 129, 149-157 is of a simple barge designed to ensure significant hydroelastic response. The analysis steps are covered in detail. The input files are provided in the Examples download on the program download page. The workflow is described in Workflow for OMAE Barge.pdf. The videos correspond to the steps in that document.
Introduction – 17 min 06 sec – Alternate
Eigen-1 – 34 min 02 sec – Alternate
Eigen-2 and Eigen_View – 22 min 13 sec – Alternate
Eigen-Post – 10 min 20 sec – Alternate
Kf – 20 min 35 sec – Alternate
Hydrodynamics – 34 min 09 sec – Alternate
RAOs – 36 min and 28 sec – Alternate
Wet Frequencies and Modes – 8 min and 40 sec – Alternate
Animation – 6 min and 21 sec – Alternate