Making Tidal Energy Projects Stick:Lessons learned in the analysis of moorings, anchors, and

operations at tidal energy sites in the Bay of Fundy

ICOE Halifax 2014

Dean Steinke, PEng, MASc

ICOE Halifax 2014

Dean Steinke, PEng, MASc

Overview

• About DSA and dynamic analysis

• Lessons learned

• Research needs

About DSA

• Victoria, BC

• Halifax, NS

• Started 2006• 7 technical full-time• Formed by Ryan Nicoll /

Dean Steinke• Spin off from UVic

What does DSA do?

What does DSA do?

• Creates virtual prototypes of marine, offshore and subsea technologies

• High-fidelity numerical simulation and analysis

• “dynamic analysis”

What is dynamic analysis?

• Predicting motions of structures on and below ocean

• Problems are nonlinear– Forces dependent on

motions– Motions dependent on

forces

• Referred to as:– Global analysis– Coupled analysis– Multi-body dynamics

DSA Offerings

Services

• Research and development

• Concept studies

• FEED

• Design assessment

• Operational support

• Detailed analysis and design

Industries

• Subsea

• Marine renewable energy

• Defence / Naval

• Offshore

• Marine Engineering / Naval Architecture

• Ocean technology

• Aquaculture

Applications

• Mooring analysis• Risers / pipelines *• Marine towing / salvage• Towed bodies• UUVs / AUVs / ROVs• Aquaculture

• Launch and recovery• Wave energy devices• Tidal energy platform

design• Seakeeping analysis• Subsea installation

analysis

Bay of Fundy mooring study and installation analysis

ProteusDS Key Capabilities

• Cable / pipeline finite-element model

• Mechanism model

• API / controllers

• 6 DOF rigid body model – coupled vessel / line hydrodynamics

ProteusDS Environmental Modeling

• Spectral wind model

• Regular / Irregular wave models

– JONSWAP, PM, Airy,

• Current modeling

• Linear / nonlinear seabed models

Lesson 1: Know your project phases

• Know your project phases

– Feasibility

– Concept study / Pre-FEED

– FEED

– Detailed design

• Don’t try to skip steps

• Build slowly

Lesson 2: Know your seabed, know your site

Lesson 3: Be sensitive

• Check the sensitivity of designs to:

– Wind

– Waves

– Current

• Check your costs

• Conduct failure analysis

Lesson 4: Perform simple tests

• Simple tests can reinforce your assumptions

• Not every problem needs to be solved by a PhD dissertation and a million dollar grant

• Build simple models

• Add complexity as it is warranted

Lesson 5: Wave loading is important

Lesson 6: Work in a team and create lots of drawings

• Operations

• Managers

• Engineers

• Research engineers

• Oceanographers

Lesson 7: Know your offshore standards

• Offshore standards aren’t necessarily too stringent

• Well referenced:

– DNV RP C205 – Environmental Conditions and Environmental Loads

– DNV OS E301 – Position Mooring

– API RP 2SK – Design and Analysis of Stationkeeping Systems for Floating Structures