Short Course on Theory and Practice of Riser and Mooring Dynamics

Dr Subrata K Chakrabarti, President of Offshore Structure Analysis Inc, US visited WIT to present a one-day course entitled ‘Theory and Practice of Riser and Mooring Dynamics’

Lectures were presented on the following topics:

Basic Hydrodynamics Current and Wave Loads Inline & Transverse Forces Hydrodynamic Coefficients Damping of Moorings and Risers Frequency and Mode Shapes VIV mechanism Lock-On Phenomenon VIV Suppression Mooring Types (catenary, taut, etc) Mooring Components & Turret Mooring Line Characteristics Static Catenary Equations Dynamics of Moorings Field Testing	Drilling & Production Risers Riser Equations Steel Catenary Riser SCR Equations Dynamics of Risers Fatigue Analysis Method of Solution CFD Analysis Commercial Software Design Guidelines Example Problems Scaling Laws and Test Facilities Mooring System Modelling Riser Modelling Case Study

Course Objectives

The course had two main objectives:

1. To provide a basic understanding of the hydrodynamic design of moorings and risers with particular emphasis to their application.
2. To offer experience with the actual design analysis, model tests and field application.

A lecture on a theoretical topic identified in the course outline was presented emphasizing different mooring and riser types used in offshore structures, and their method of analysis.  Subsequently, a discussion was made with relevant design calculations and their applications. Applicability in design and limitations of the methods were discussed and demonstrated with the help of practical examples and design charts.

Course Presenter

Dr. Subrata K. Chakrabarti is the President of Offshore Structure Analysis Inc. and the past Director of Marine Research Division of Chicago Bridge & Iron Company. He has more than 35 years’ experience in offshore structure design and analysis and has been involved in the development of many offshore production structures.  He has published over 180 technical papers and has written four textbooks.  His fourth textbook “Theory & Practice of Hydrodynamics and Vibration” will form the basis for this course. Selected materials from his other books "Hydrodynamics of Offshore Structures" "Offshore Structure Modeling”, and “Handbook in Offshore Engineering" (Editor), were also included in the course.