We work in technology-rich workplaces, where we need to keep skills current to ensure that the companies we work for stay competitive. Professional development has many benefits, and DSA wants to help you and your business to continue running effectively and efficiently.
Whether you are a new ProteusDS user or a seasoned pro, regular professional development and software training can build skills within your company that will improve your bottom-line by ensuring you are using the most effective tools and processes.
We’ve compiled some of the top reasons to invest in ProteusDS training:
#1 Keep up with industry changes
Ocean engineering best practices are always evolving, to avoid being left behind it’s important for you and your business to keep on top of them. At DSA we work across many ocean sectors which give us a tremendous knowledge base to draw upon in training sessions. To the benefit of all attendees, standards and recommended practices for analyses are frequently discussed during training.
#2 Keep in touch with the latest features
New features within ProteusDS are developed all the time! Our team announces these advancements in all our major releases updates. In a training session, you can discover first-hand how these new features are used. In addition, not every feature is discussed in the tutorials or in release announcements. We often dive into these lesser known features in our training sessions.
#3 Keep one step ahead of the competition
Training helps users be more productive and efficient. Huge investments in tools without the appropriate training can signify inefficiencies that affect your company’s competitiveness. We find that users who invest in training find new and better ways to ProteusDS that save their businesses time and money.
#4 Keep connected with the software developers
Training with the software developers has three significant benefits. First, you are learning from the experts. Second, if you are encountering complex issues or have concerns with your simulations these issues are addressed quickly and efficiently. Lastly, training sessions provide an invaluable opportunity for you to give feedback to DSA that can guide future developments that will make your ProteusDS usage more efficient and tailored to your specific needs.
A.J. Baron, Project Engineer with DSA leading ProteusDS training in Singapore, March 2017
Interested in learning more about ProteusDS training options? Want to book training today?
DSA is very pleased to announce the release of ProteusDS v2.36. The software is ready to go and active subscribers can use their login credentials to download the latest version from our website. We’ve highlighted some of the key new features below.
Support for visualization-only models
A good computational model is very different than a 3D model used for purely visualization purposes. Because of this, we have added the ability to handle models that are to be used for visualization purposes only. Now, in the ProteusDS Simulation Toolbox, you can add a $VisualizationModel property toaRigidBody. The model specified through this property is not used for computations. We have added functionality in both PostPDS and ProteusDS Simulation Toolbox to toggle visualization or computational models on or off.
Comparing computational and visualization display modes in PostPDS
We have released a set of powerful bathymetry analysis features in PostPDS that allow users to assess seabed slope and depth. To access these features, simply right-click on the Seabed item in the Categories tree in the UI, and select the appropriate Bathymetry Plotting option. The depth and slope plots now have legends that make it easy to interpret seabed data. The exclusion zone plot allows you to find safe regions to place equipment or position anchors.
PostPDS showing the slopes in a bathymetry file using the bathymetry plotting options
Modeling ropes that are sewn into nets
For our aquaculture and net-modeling users, we have added support for modeling rib-lines or “structural lines” that are frequently sewn into nets to add strength and shape. This is done within the Net DObject itself and not using additional Cable DObjects. This dramatically reduces the numbers of DObjects and connections required to simulate a net pen with rib lines leading to faster simulations. To apply a rib-line to a net, use the $ExtCableLongitudinal or $ExtCableTransverse property in the Net input file.
We have also added an option to connect the end of a line to any point on a net. You do not have to connect a line directly to a node! This is much easier for creating supporting lines in net pens. To create this connection specify the Net as the master and the Cable as the follower, and use the Point connection type.
Visualization of structural lines (indicated in yellow) that are sewn into net panels.This feature reduced net analysis complexity significantly.
So, that’s ProteusDS 2.36 – we hope you enjoy it and find the new features useful.
v2.36 Change log
Added time history plot functionality for RigidBody DObject in PostPDS
Added legends for bathymetry plots in PostPDS
Added support for computational and visualization models in ProteusDS solver, PST, and PostPDS
Added height above seabed probe to RigidBody to check for clearance
Added inclination angle and tension output for ExtMass and ExtMassCylinder attachments
Added ability to connect the end of a cable to anywhere on a net panel
Added ExtCable functionality to Net DObject to allow for modeling of ropes which are sewn into nets to provide strength and shape
Enhanced ‘Duplicate Selected DObject(s)’ functionality to allow for optional duplication of connections
Addressed overlapping water rendering
Improved full-screen support with ability to toggle the display device that the full-screen window appears on by pressing ‘F1’
Addressed mooring line naming issue with taut leg mooring generator
OCEAN ENGINEERING COMPANY DSA ANNOUNCES REPRESENTATION FOR SOUTHEAST ASIA
Halifax, Nova Scotia – Dynamic Systems Analysis Ltd. (DSA) maker of ProteusDS dynamic analysis software is pleased to announce that it has signed an agreement with OceanPixel of Singapore and they will represent DSA and its software products in Southeast Asia.
DSA is an engineering services and software development company. ProteusDS is DSA’s flagship hydrodynamic and mechanical marine dynamic analysis software package. It is customizable, validated, efficient, and reduces the risk for its users by allowing them to assess how their technologies will respond to extreme wind, waves, and currents. ProteusDS is capable of enhancing in-house analysis, design, and system optimization capabilities for offshore, subsea, and marine organizations.
OceanPixel currently offers suitability analytics and other technical services for the marine renewables market, including engineering and environmental assessment. It is working on projects in Singapore, Indonesia, and the Philippines, and is pursuing projects all over Southeast Asia.
“OceanPixel is proud to have Dynamic Systems Analysis Ltd as a partner in advancing the marine renewable energy industry in Asia.” said Michael Lochinvar Abundo, Managing Director at OceanPixel. “Through this partnership, we hope to deliver a range of great quality services to various sectors involved in the Marine and Offshore industry.”
The collaboration between the two companies will enable delivery of turnkey solutions to the marine renewables market in Southeast Asia. OceanPixel will provide sales, training, and consulting services for DSA’s products in the market.
“We’re very excited about this partnership,” said Dean Steinke, Director of Operations at DSA. “Working within the marine renewables sector has always been a natural fit for us. The uniqueness of the marine renewable industry calls for constant innovation. It requires the provision of software and teams like OceanPixel’s that are extremely flexible and adaptable to the sector’s needs. OceanPixel will expand our presence in the increasingly important Southeast Asia marine renewable market. It’s an ideal partnership.”
OceanPixel Pte Ltd (OP) is a Singapore start-up company spun off from the Energy Research Institute at Nanyang Technological University (ERI@N) incorporated in September 2014. The core team has combined expertise in Renewable Energy research, development, demonstration, project development and know-how and experience in the relevant industry ecosystems, business, finance, policy and education.
Offering technical services, data catalogues and report products, we have various global involvements and currently handles projects in Singapore, Indonesia, and the Philippines with potential projects in other parts of Asia under development.
Strategically partnering and collaborating with experts from the UK and, with access to marine renewable energy thought leaders in the South East Asia (SEA) region, OP has positioned itself to be the pioneer company dedicated to ocean renewable energy planning and development in SEA and beyond.
Subsurface mooring deployment, recovery, and performance in current and waves
For many years moorings have been designed using basic mass-drag-buoyancy calculations, spreadsheets, rules-of-thumb, black magic scripts, and a dose of ‘salty-sea-dog’ experience. With these methods, we can frequently estimate a line size to use or an approximate anchor weight. But sometimes despite our experience we still have questions. This article looks at increasing the precision of mooring analyses using numerical modeling software designed for ocean engineers.
Software for single point moorings has come a long way in recent years. Finite element-based cable analysis programs have been tested and developed by oceanographic institutions and ocean engineers for various purposes (towed bodies, ROVs, moorings, etc.). However, their use has been typically limited to a few advanced numerical modelling specialists who had both the expertise and patience to wade through the complex analysis process. In recent years, increasingly-refined software has been developed. This software has benefited from increased computational power and advances in 3D graphics. We can now get a much clearer picture as to what is happening with our moorings subsurface through simulation and visualization.
The video below demonstrates an analysis carried out using our ProteusDS software.
Analyzing buoy pitch and knockdown in current
The video shows four buoys of various styles (spherical, elliptical, and streamlined) being loaded by current. As the current ramps up to 3.6 knots, the knockdown and pitch of the buoys increase. There are two key forces at play – buoyancy and drag. The buoyancy provides a vertical restoring force that keeps the buoy from pitching. Conversely, hydrodynamic drag pitches the buoys about their mooring connection point.
A pitch of greater than 20 degrees is not recommended for ADCPs, as the inclinometers which allow for compensation of buoy pitch typically only have a range of 20 degrees. Mooring designers would try to limit ADCP buoy pitch to only a few degrees if possible. In addition to uplift and drag, buoy pitch also depends on the length of the mooring and weight of mooring equipment (chain, shackles, line, etc.).
The example shows that increased buoyancy is effective in preventing knockdown and limiting pitch, as the AF49-750 buoy has the lowest pitch and knockdown of the elliptical and spherical buoys. However, this buoy still pitches significantly at the higher currents, whereas the streamlined StableMoor® buoy, with its reduced drag and configurable connection point, is effective at maintaining low pitch and knockdown.
The ProteusDS model uses 6 degrees of freedom for the buoys (heave, sway, surge, roll, pitch, and yaw). Although this case is essentially 2D, the solver solves for the position in 3D. The effect of the attachment point and location of drag loading affect the pitch calculated by the software.
The ProteusDS software pre-processor is shown. This software allows users to add mooring elements such as shackles and swivels from a central library. Line types such as Amsteel Blue or wire rope can likewise be selected.
Transient loading and acoustic release damage during mooring deployment
One aspect not often considered by mooring designers is what happens during deployment. As shown in the video, the simulation allows for prediction of launch transients, which ensures that shackles and lines are properly selected to handle the deployment loads.
We’ve observed that acoustic releases get damaged during deployment when they are placed too close to the anchor. ProteusDS can be used to check that the acoustic release’s downward momentum will not cause it to crash into the seabed or anchor.
A few questions I’m asked from time to time are: How long will it take for the mooring to come to the surface? and, How far might the mooring drift as it comes to the surface? The mooring recovery section of the video shows how you can assess this.
In the case considered, the AF36-750 mooring rises at about 2.7 meters per second. If this mooring was deployed at 750 meters, it would take between 4 and 5 minutes to surface!
Although no current was applied in the example, current can be applied in the simulation to determine how far it might drift in the time it takes to get to the surface.
ProteusDS post-processing software showing rendered view of the mooring systems being tested.
Interaction of waves with subsurface moorings
Much like current, waves can cause an ADCP mooring to pitch and move. The example in the video shows the impact of the subsurface orbital wave motion on the mooring line and buoy. A JONSWAP wave spectrum is simulated to check how much the buoy will pitch. Clearly, in this case, a bottom mounted ADCP frame would be preferred – but we don’t always have the equipment we need on hand. It’s good to have tools to check the impact of waves on our moorings.
DSA has carried out a series of simulations in consultation with DeepWater Buoyancy using our ProteusDS software. The software is designed to help mooring designers and builders to answer practical questions about mooring performance. Most would agree that the software’s 3D visualization capabilities shown in the video are really cool, but I believe that the real value of the software is that we don’t have to speculate what is happening subsea. We can now get a clear picture.
Curious to learn more about using dynamic analysis software to assess mooring deployment, recovery, and performance in current and waves?
About DeepWater Buoyancy, Inc.
DeepWater Buoyancy creates subsea buoyancy products for leading companies in the oceanographic, seismic, survey, military and offshore oil & gas markets. Customers have relied on our products for over thirty years, from the ocean surface to depths exceeding six thousand meters.
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…
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.
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.
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 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:
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.
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
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