cDynamics

Experts in engineering simulation CFD, FEA & Offshore Dynamics

MARINE | COMPOSITES | RENEWABLES | SUBSEA

About cDynamics cDynamics is an engineering consultancy company founded in Kristiansand, Norway, in 2015. We provide technical advisory services in segments such as marine operations, shipbuilding, steel and composite design and fluid- and thermal flow.

Our expertise spans from structural analysis and CAD to advanced dynamic co-simulation. As of 2021 cDynamics count 8 engineers and is rigged for further growth.

Knut Inge Edvardsen CEO

Glenn Tørå CTO

+47 45 03 28 41 knut@cdynamics.no

+47 41 50 85 37 glenn@cdynamics.no

Come and engage with the engineering team in cDynamics.

We provide you with independent expert analyses and documentation exactly when you need it. Our expertise in design, analysis, and software can be what you need to bring your project forward.

Offshore wind and marine operations We have been assisting many clients with their difficulties regarding offshore wind and marine operations in general.

Our experience has helped with hydrodynamic issues, unwanted structural vibrations, forces in hydraulic cylinders, control system tuning to avoid negative damping of floating wind turbines, dynamic positioning, lifting procedures and cable analyses – just to name a few examples.

Foundations

Cables Operations

Foundations

Cables

Concept developments for floating offshore wind. cDynamics have delivered concept simulations to several new offshore wind foundation concepts.

Ten years of experience in cable protection systems for offshore wind turbines and substations.

We deliver verification of cable and cable protection systems against ULS and FLS loads for bottom fixed and floating wind farms.

Marine operations Offshore handling and installation simulation of offshore wind monopiles and jackets, subsea lifting operations, cable installation and pull-in.

Different offshore wind turbine concepts.

Offshore wind turbine on a jacket foundation.

Andreas Ommundsen

Kasper Sandal

Ane Vatshelle

+47 95 25 30 30 andreas@cdynamics.no

+47 97 95 45 18 kasper@cdynamics.no

+47 90 93 30 74 ane@cdynamics.no

Offshore dynamics and CFD engineer

Team leader offshore wind

Offshore dynamics engineer

Offshore power cable verification Structural cable verification

Cable heat analysis

We deliver verification of cable and cable protection systems against ultimate fatigue limit states for bottom fixed and floating wind farms.

We document temperatures in cable/CPS using CFD or calculation according to IEC 6028.

Track record of structural verification/ analysis of cable protection for Hornsea One and Trianel offshore wind farms.

Tender analysis for 10 other bottom fixed wind farms.

We document structural integrity of cable and CPS using OrcaFlex. Fatigue analysis of power cables in OrcaFlex/Helica (DNV).

Thermal analysis of wind turbine power cable.

Installation analysis Virtual testing of commissioning and decommissioning to reduce risk.

Ultimate Limit State (ULS) and Fatigue Limit State (FLS) analysis of wind turbine power cable.

Installation of wind turbine power cable.

Co-simulation For optimizing and dimensioning of hydraulic, electrical or control systems, it is important to model the coupled effects between the “internal” system and the external system (e.g. payload). A co-simulation captures the coupled effects and reduces risk of overseeing important dynamics.

We can deliver a co-simulation package consisting of: 1. A model of the external system in OrcaFlex 2. A SimulationX model exported as a Functional Mockup Unit (FMU) of the sub-system (hydraulic/electrical/control) 3. A wrapper that makes the OrcaFlex model and the FMU talk to each other

The work flow of a co-cimulation analysis.

Flow analysis We have experience with a wide variety of CFD-projects, and most of the common software’s used for fluid flow. At present we are mostly using OpenFOAM for free surface problems and Acusolve by Altair for most other analyses, as well as RADIOSS (also by Altair) for fluid structure interaction analyses (FSI). We have our own in-house HPC server suitable for CFD-simulations.

Slamming Impact loads due to waves and/or motion are problems we have experience solving with CFD – also considering fluid structure interaction if necessary. A normal delivery from us would include the loads due to the slamming pressure from a set of load cases, and if desired the utilization of relevant structural parts.

An FSI slamming simulation of a WaveFoil.

Green sea Analysing green sea is demanding due to its non-linear nature. Best results (not including model tests) are obtained with CFD-analyses, and we have the know-how to do this. A normal delivery from us would include results from several wave cases, and the pressure loads due to the water on relevant structural surfaces.

Green sea analysis of a fixed structure.

Using simulation to choose right mud agitator A mud agitator is mainly used to agitate and mix the drilling mud to prevent solid particles from depositing in the tank. For proper mixing the mud agitator must be properly sized with respect to power requirement and impeller size.

Read more on our website.

Working offshore represents a big investment in time, money and effort.

Reduce your risk by simulating the effects of the ocean on your material.

Wave, wind and current loads Simple potential theory can be used to obtain the wave loads in frequency domain if the wave loads are linear. However, if they are non-linear, more sophisticated methods must be carried out. We have the tools and competence to calculate non-linear wave loads. A normal delivery from us would include the wave loads on a selected structure for several load cases.

Wind and current loads, on for example super- and substructures of ships or platforms, are highly dependent on direction, and might be calculated with CFD simulations to find the values of drag coefficients. A normal delivery from us would include the wind/current loads or drag coefficients on a selected structure for several wind/current directions.

Wave loads on an inclined cylinder, also taking into account the internal resonant piston modes.

Pulling a submarine out of a moonpool An innovative way to lift heavy objects out of the water is to use a moonpool, which essentially is a vertical tunnel in the middle of the ship.

The advantage of a moonpool lift relative to a conventional lift is that the vertical force acts close to the centre of gravity, and thus generates much smaller pitch or roll moments to the vessel.

Read more on our website.

Linear potential theory and seakeeping analyses We have much experience with linear analyses based on Response Amplitude Operators (RAOs). A typical delivery from us would include meshing of the geometry, calculation of the wave frequency response – also accounting for second order wave drift loads – and often applying the results in further analyses. This usually involves tweaking the viscous damping loads based on model tests or CFD analyses and calculating the response in irregular waves, typically with mooring lines or other structural components connected to the vessel. The simplicity and speed of such analyses makes them widely used, and the results are reliable as long as one knows when they are valid or not. The software we use for these types of simulations are OrcaWave and OrcaFlex by Orcina.

Computational mesh of OO-Star floating wind turbine foundation.

Structural analysis We offer high competence in structural analysis (FEA), within areas spanning from linear static analysis for structural dimensioning purpose to dynamic analysis related problems such as vibration and damping.

We have broad and extensive background in dimensioning of both isotropic materials such as steel, aluminium, titanium, and non-isotropic materials such as glass- and carbon fibre composites. Our structural engineers are familiar with close collaboration with design engineers and fabrication yards ensuring cost-efficient designs with good producibility.

For structural analysis we use software such as Altair HyperWorks, Staad/Pro, EsaComp and MathCad. Structural dimensioning • • • • •

Static linear analysis Steel design and code check Joint design, welds and bolts Buckling analysis Fatigue analysis

Vessel structural design

Advanced simulation

• Glass and carbon fibre hull designs • Composite joints design and analysis • Specification and support of composite lab tests

• Dynamic analysis • Impact and shock analysis • Vessel drive train analysis (Forced vibration analysis) • Anistropic material models

Design and CAD Our strong bonds between analysis and design ensures close collaboration between design engineering and analysis engineer, making sure your product design is in safe hands.

Our main software for design work are SolidWorks, Autodesk Inventor and Rhinoceros.

Structural/Mechanical

Ship design

Design work

• Steel design drawings • Mechanical design drawings

• General arrangements • Ship line drawings • Complete set of hull structural drawings

Advanced/free-form geometry.

Monica Vegsund

Øystein Rott

Magnus Strøm

+47 99 11 76 73 monica@cdynamics.no

+47 41 33 33 66 oystein@cdynamics.no

+47 45 29 52 73 magnus@cdynamics.no

Structural analysis engineer

Design engineer

Design engineer

www.cdynamics.no 2021