How to Solve 8 Tough Ocean Engineering Problems with Dynamic Analysis

Many engineers think of dynamic analysis as being required for analyzing risers and moorings in the offshore industry. But dynamic analysis is used in many other marine sectors.

ProteusDS is DSA’s dynamic analysis software. It is used by ocean engineers and industry professionals to conduct dynamic analysis of systems that are exposed to extreme wind, current and waves. There are many applications for the software outside of offshore oil & gas – so let’s explore just how diverse the software is…

Aquaculture

These systems include traditional fish farms in both circular and square cage designs along with shellfish aquaculture farms. These systems often contain nets which are connected to moored rigid or semi-rigid structures, such as buoys and floating collars.

As the aquaculture industry continues to grow, the number of traditional sheltered sites is declining, and thus an increasing number of installations are operating in regions that are exposed to high energy ocean swell, current, and wind conditions. The need to understand how to design aquaculture installations is necessary.

To support accurate aquaculture analysis, we have recently added wake-shielding and self-shielding models to ProteusDS, which is essential to avoid any overly conservative estimation in the loads on fish farms for installations.

Debris Impact & Cable Contact

ProteusDS has been recently enhanced to model contact between bodies. This technology could be used to predict the effects of ice or a log impacting a floating platform. Alternatively, lines running through a sheave or a chute can be modeled. This capability is under active development, and users interested in testing it should contact us.

Cable Ferry

ProteusDS is used by naval architecture firms to predict the motion of vessels and marine platforms. Used in conjunction with BEM software like DSA’s ShipMo3D, ProteusDS is used to perform seakeeping and manoeuvring studies. These studies can include moorings, towlines and cables.

ProteusDS was recently used to conduct an in-depth analysis of a cable ferry running between Vancouver Island and Denman Island in Western Canada. The ferry was modeled using a 6 DOF rigid body. The model developed captured key sources of loading, including wave diffraction and wind loading on the superstructure. The ferry travelled across the channel using a simulated traction winch that acted on the drive cable.  The cables were modeled using the finite element cable model that also interacts with the bathymetry of the channel. The ultimate and fatigue loads in the cables were assessed using the model.

 

Commercial Fisheries 

The ability to model winches, lines, vessels, and nets enables allows modeling many types of fishing operations. Through numerical modeling of commercial fishing operations, ProteusDS has been used to cut client’s’ costs by limiting snarls and providing feedback on optimal tow arrangements and winch selections. DSA has also generated informative 3D visualizations of the behaviour of fishing gear in the water and supervised flume tank testing of fishing gear.

 

Elastic Moorings

Elastic moorings are often used in situations where elongation or compliance is needed, but where a chain mooring is not practical or may harm the environment, or where space is limited. The Seaflex elastic mooring technology relies on a viscoelastic rubber hawser with specially formulated characteristics that is used to manage loads.

The load response of Seaflex depends on the time history of loading.This complex hysteretic phenomenon, while well understood from a conceptual standpoint, can be difficult to represent numerically. Seaflex and DSA worked together to solve this problem and accurately model the response of Seaflex mooring technology using nonlinear axial rigidity parameters. This nonlinear axial rigidity modeling capability is also useful for synthetic rope with nonlinear elongation characteristics – such as Nylon.

 


Towed Arrays & Towfish

ProteusDS can also be used to simulate towed systems such as towfish or towed arrays. For towfish, the foil model is used to model control surfaces. The control surfaces can be actively controlled to maintain depth or altitude. The tow cable and vessel dynamics can be incorporated to perform layback analysis.

Similarly, the high fidelity cubic finite-element cable model can be used to analyze the loading and profiles of high speed towed arrays for seismic or defence applications.

 

Launch & Recovery 

Safely deploying and recovering equipment (spools, jumpers, AUVs, ROVs, small craft) from vessels in various sea conditions is a potentially high risk operation. Predicting the limits of safe launch and recovery operations in terms of human factors, loading and motions can enable operators to make good decisions in the field and prevent errors.

ProteusDS contains a mechanism modeling and control infrastructure that model A-frames, cranes, and other handling equipment. Offloading, lowering, and many other operations can be simulated. An important benefit of this type of analysis is that visualization of these simulations helps managers, analysts, and others better communicate with each other about how complicated operations will take place.

 

 

Tidal Device Installation

In many ocean sectors, sea trials or operator experience largely guide routine marine operations. However, in tidal energy, the strong directional currents and narrow deployment windows make it difficult to perform sea trials safely and cost effectively, and there is often less operator experience. ProteusDS has the ability to perform fully coupled analysis of floating service vessels installing structures such as tidal turbines, floating platforms, or laying cable.

Modeling the waves and currents in tidal passages is important for these assessments.  ProteusDS contains a spatially and time varying current modeling capability that enables accurate representation of large-scale eddies and turbulence which will impact towing operations.

 

 

Designing for the ocean environment is a constant challenge. Dynamic analysis with ProteusDS allows for rapid innovation and optimization while reducing risk.

To learn more about DSA’s services, or licensing the ProteusDS software please feel free to:

ProteusDS v2.34 is now available

v2.34 is now available

It’s been an exciting and busy start to 2017 here at DSA and it’s been several months since our last release of ProteusDS (v2.29) – so we are very pleased to announce the release of ProteusDS v2.34.

The software is ready to go and login credentials for active subscribers will allow you to access ProteusDS v2.34 from our website.

Version 2.34 introduces new functionality, including:

Net modeling enhancements


The latest version of ProteusDS contains fixes and enhancements for net modelers. Improvements have been made to increase the accuracy of predicted hydrodynamic forces on nets, and mooring components in the wakes of nets.  The pre-existing wake-shielding model, which accounts for fluid velocity reduction through nets, has been updated and is considered essential for not over-estimating forces on successive net pens in simulations. This builds on the self-shielding model that was added in the previous release to account for local hydrodynamic shielding between adjacent net twines at low angles of incidence

Secondly, automatic adjustment of net twine drag coefficient with Reynolds number has been added as default to nets, and has been proven to accurately estimate hydrodynamic forces on nets over wide ranges of fluid velocity. DSA has produced a validation document which outlines the net model developments for estimating hydrodynamic loading and comparisons made to experimental tank tests of nets and full-scale fish farms. It is critical that net users add to their existing net model input models the $FluidCoefficientReData property.

Enhancements have also been made to the net arc space calculations in ProteusDS, which is used to position external masses on nets. Performance improvements were made by switching from a bi-quintic to a linear-cubic interpolation scheme.

The image shows a side view of three successive square aquaculture pens, with current flowing right to left. The leading cage experiences the largest hydrodynamic forcing and netting deformation. Current velocity is then reduced with the wake shielding model as the flow traverses through multiple nets, as seen in the middle and trailing cages.

 

Lastly, improvements have been made to previsualization of nets in the ProteusDS Simulation Toolbox. Users can now distinguish which net edge is which according to its colour.

Users can now distinguish which net edge is which according to its colour.

Cable model damping optimization


The finite-element cable model is one of the core models in ProteusDS. Users will now have the ability to automatically estimate a reasonable axial damping coefficient in cables based on a damping ratio, axial stiffness and element lengths. Testing has shown that this typically results in major simulation speed-ups.

Simulation execution time can be greatly increased by utilizing automatic cable damping, as each instance of a cable segment defined in a cable has a particular calculated axial damping coefficient based on the average element stiffness, average element length, and cable node mass covered by the cable segment.

 

Environmental condition transitions


The latest version of the ProteusDS contains a major new feature that allows control over the application current, wind and waves in a simulation. We’ve added the ability to independently control when the current, wind, and wave conditions will start in any given simulation and the length of time that those conditions will be ramped to their set state.

Previously the singular $TRamp property was used to control ramping of all environmental conditions. Users could not, for instance, have a steady state current with wind and then have waves start at some point later on in a simulation.

This feature is very useful when a user wants to determine an initial steady state configuration (positions and loads) for a model (e.g. a mooring system, a fish farm, a moored buoy) – then after the steady state is reached, introduce unsteady wave loads. Previously this level of analysis was only achievable after running separate simulations.

So, that’s ProteusDS 2.34 – we hope you enjoy it and find good use for all the new features.

 

Complete list of additions, changes and resolved issues.


Additions:

  • ProteusDS Simulation Toolbox pre-visualizer now displays name of any currently selected DObject(s)
  • Added Net edge and ribline colouring to pre-visualizer
  • Added automated calculation of axial damping for Cables/Scables using $AxialDampingMode property
  • Added environmental timing/ramping options to the Environment input file which allows users to set the start time and ramp duration independently for wind, waves and currents.
  • Improved 2.5D spatially varying current loading
  • Added Reynolds number dependent drag as default to net panel feature
  • Added defaults for variation of drag with Re (for cylinders)
  • Improved drag loading and wake/shielding model for nets
  • Improvements to simulation destabilization detection

Resolved issues:

  • Addressed a number of rendering issues in pre-visualizer
  • Improved performance of pre-visualizer rendering
  • Resolved out-of-bounds current sampling
  • Renamed “Transform” to “Translate / Rotate” in ProteusDS Simulation Toolbox

View our 2015 change log here

Western Economic Diversification

Dynamic Systems Analysis recently took part in an initiative with Marine Renewables Canada to further emphasize the opportunity that marine renewables can bring to Canada.  DSA submitted a  letter of support to the Western Diversification Program to demonstrate the opportunities and benefits industry development is creating for local businesses, communities, and organizations across Canada.

The purpose of this outreach initiative is to broaden the current dialogue around marine renewable energy companies to ensure they have opportunities to provide expertise and solutions to the growing marine renewable energy market.


To whom it may concern:

RE: Western Diversification Program Call for Proposals – Marine Renewables Canada’s Supplier Engagement and Development Initiative

Dynamic Systems Analysis Ltd.(DSA) strongly supports Marine Renewables Canada’s proposal for its Supplier Engagement and Development Initiative which is aimed at supporting Western Canadian companies (namely SMEs) in participating and benefiting from the emerging marine renewable energy sector. As a new cleantech sector, marine renewable energy development requires a range of enabling technologies, expertise, and innovation that is currently present in Western Canada.

Marine Renewables Canada’s past work with its membership in British Columbia, Manitoba, and other areas of Canada has been successful in helping Canadian companies gain new business development opportunities and carving out a leadership role for Canada in this new cleantech sector. We are particularly pleased to see Marine Renewables Canada leveraging past work and current funding from other sources to ensure that Western Canadian companies and organisations can play a role in local, national, and international marine renewable energy advancement.

DSA is an ocean engineering consultancy and software company. We provide progressive and accessible dynamic analysis software and expertise which makes it possible for ocean engineers, naval architects, oceanographers – or anybody with business in the water – to assess the motions and loads on vessels, structures, lines, and technologies in marine environments.

Over the years DSA has thrived providing engineering services as part of a growing supply chain to companies developing renewable energy technologies destined for areas like the Bay of Fundy, across Canada and around the world.

DSA has invested and will continue to invest, in developing our dynamic analysis software, ProteusDS, which will continue to contribute to advancing marine renewable energy. However, because this is an emerging technology there is a need for continued support to assist companies/SMEs in participating in the sector and developing solutions that have global applications.

We fully support Marine Renewables Canada’s proposal and look forward to the work the association will do to catalyze and facilitate development of a national marine renewable energy industry in which Western Canadian companies play an important role.

ProteusDS Singapore Workshop

About ProteusDS training

If you want to maximise your ProteusDS investment, there’s no better way than giving you or your people the skills to use ProteusDS to its fullest extent. That’s why we offer a range of training options, from small in-person classes to virtual training, self-led tutorials, and private workshops.

 


Course type: ProteusDS user workshop

When: March 9th & 10th 2017

Where: The Hive

Nanyang Technological University
52 Nanyang Avenue Singapore 639816

Room TBD

Please email Martin Koh @ martinkoh@oceanpixel.org for confirmed final event location


Registration:

Please email Martin Koh @ martinkoh@oceanpixel.org to register.


Who should attend?

  • New users
  • Prospective users
  • Existing users looking to refresh or build skills and
  • Technologists, engineers, and scientists deploying and designing moorings

Key topics:

  • Single and multiple leg moorings
  • Subsurface moorings
  • Automated mooring report tools
  • Tidal energy platforms
  • Wave energy converters
  • Towed bodies
  • Booms and floating pipes
  • Aquaculture net systems
  • Tug, barge, and towed systems
  • Simulating cables, moorings, chains in the marine environment
  • Details in finite element line modelling: meshing, damping, hysteresis
  • Details in floating structure hydrodynamics modelling: meshing and wave radiation/diffraction effects
  • Environmental effects including current, tides, waves, wind effects and
  • Optimizing simulations for speed

All places are reserved on a first come first served basis. To reserve your spot please contact:

Martin Koh
martinkoh@oceanpixel.org

2017 Events

We’re crossing the globe

to attend industry events near you


February

San Diego, California-  OiNA

February 14 –  16


March

Singapore – Introduction to Ocean Renewable Energy /  Introduction to ProteusDS

March 8-9

Madrid, Spain –  TC114 Plenary

March 13-17


May

Halifax, Nova Scotia – Aquaculture Canada

May 27th  – 31st


June

Trondheim, Norway – OMAE 

June 25th –  30th


August

Trondheim, Norway – AQUA NOR

August 15-18

Cork, Ireland – EWTEC

August 27th –  September 2nd


*This list will be updated periodically throughout the year as conference and event attendance is confirmed.


 

DSA Joins Powerful Altair Partner Alliance

logoaltair logo

Halifax, Nova Scotia – Nov 21st, 2016 – Dynamic Systems Analysis is pleased to announce we have joined The Altair Partner Alliance (APA). The Altair Partner Alliance (APA) gives clients access to a broad spectrum of software products using their existing HyperWorks Units (HWUs) at no additional cost.

The addition of DSA’s ProteusDS and ShipMo3D software will allow APA clients test virtual prototypes of systems that are exposed to extreme wind, current, and waves and the interactions of ships and offshore structures with waves and the marine environment.

“Altair provides many tools and solutions for the maritime industry and we are continually searching for ways to increase value to our customers,” said Molly Heskitt, Senior Director of Business Development, Marine and Shipbuilding Industry at Altair. “Working with DSA to provide access to their unique offerings in hydrodynamics and ship design is a great example of how Altair’s Partner Program can provide that additional value.”

ProteusDS is a full featured hydrodynamic, mechanical and marine dynamic analysis software package. It is customizable, validated, efficient, and aims to reduce risk. Using advanced time and frequency domain options, ShipMo3D can analyze freely maneuvering ships and other floating structures in a variety of sea states. With a wealth of features and models, ShipMo3D is capable of enhancing in-house analysis, design and system optimization capabilities.

“DSA has always been a simulation driven company. Simulation throughout every phase of a project can reduce risk and optimize solutions,” said Dean Steinke, Co-founder & Director of Operations at DSA. “Altair’s shared commitment of this vision is why DSA joining the Altair Partner Alliance makes so much sense. It is going to be exciting to see what Altair’s users can accomplish with our software using complementary applications such as HyperMesh®!”

DSA software is used across many industries including marine, offshore, subsea and inshore. Thanks to its highly customizable design, DSA software allows the assessment of unique applications while still providing accurate results.  Data can even be exported from ShipMo3D to ProteusDS to simulate large floating or submerged structures as a part of complex moored systems.

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About Dynamic Systems Analysis, Ltd.

Dynamic Systems Analysis is an ocean engineering software and consultancy company. DSA makes it possible for ocean engineers, naval architects, oceanographers – or anybody with business in the water – to assess the motions and loads on vessels, structures, lines, and technologies in marine environments. Our ability to customize quickly and expertly respond to the unique challenges of each client and user in an open and friendly manner is our greatest strength. We constantly seek to improve and to extract maximum impact for every software feature we develop and analyses we conduct. For more information about DSA, visit dsa-ltd.ca.

About Altair

Founded in 1985, Altair is focused on the development and application of simulation technology to synthesize and optimize designs, processes and decisions for improved business performance. Privately held with more than 2,600 employees, Altair is headquartered in Troy, Michigan, USA with more than 45 offices throughout 20 countries, and serves more than 5,000 corporate clients across broad industry segments. To learn more, please visit www.altair.com.

About the Altair Partner Alliance

Altair’s HyperWorks platform applies a revolutionary subscription-based licensing model in which customers use floating licenses to access a broad suite of Altair-developed, as well as third-party, software applications on demand. The Altair Partner Alliance effectively extends the HyperWorks Platform from more than 20 internally developed solutions to upwards of 60 applications with the addition of new partner applications. Customers can invoke these third-party applications at no incremental cost using their existing HyperWorks licenses. Customers benefit from unmatched flexibility and access, resulting in maximum software utilization, productivity and ROI. For more information about the Altair Partner Alliance, visit http://www.altairhyperworks.com/apa.

Media Contacts

Dynamic Systems Analysis, Ltd.
Lauren Dunn
+1-902-407-3722 x 109
lauren.dunn@dsa-ltd.ca

Altair Corporate/North America
Biba A. Bedi
+1-757-224-0548 x 406
biba@altair.com

Altair Europe, the Middle East and Africa
Evelyn Gebhardt
+49-6421-9684351
gebhardt@bluegecko-marketing.de