5th Computational Methods and Ocean Technology (COTech 2026)

Session

Advanced Computational Methods & Applications in Marine, Subsea and Offshore Technology

CT02

Not scheduled

KE E-102 (University of Stavanger, Norway)

107. A Physics-Guided Graph‑Attention Surrogate for Farm-Scale Wake and Power Prediction Trained on Three-Turbine Configurations

Lichao Xiong

Plenary Contribution

Machine learning surrogate models for wind farm wake prediction often require computationally expensive, full-farm training data and lack physical interpretability. To address this, a graph-attention surrogate model is proposed for farm-scale wake and power prediction, trained exclusively on a 3-turbine configuration. By representing turbines as nodes and wake interactions as edges, the model...

28. A Reduced-Order 3D Streamline Simulation Model for Evaluating Perforation-Depth Effects on Injection Energy in Anisotropic Reservoirs

Shipra Singh (University of Stavanger)

Paper Contribution

High-fidelity reservoir simulators can predict well-pressure behaviour, but the mechanisms linking perforation depth, saturation changes, and injection-energy demand are often difficult to isolate. This paper presents an interpretable reduced-order 3D streamline model for water injection in anisotropic reservoirs with point-perforated vertical wells. It reveals how perforation depth,...

103. Anti-phase vortex shedding behind dual step cylinders

Lars Erik Holmedal (Department of Marine Technology, NTNU)

Plenary Contribution

Vortex shedding behind stepped cylindrical structures can exhibit complex threedimensional
wake dynamics due to the interaction between vortex cells generated by
different cylinder segments. In the present study, a numerical study is conducted
to investigate the flow past dual step cylinders at ReD = 150 with a low diameter
ratio D/d = 1.33 and three aspect ratios L/D = 1, 3, and 6....

76. Assessing the Influence of CFD Parameters on Edge Scour Predictions Using TUDFlow3D

Rui Antunes (Faculdade de Engenharia da Universidade do Porto (FEUP))

Paper Contribution

The rapid expansion of offshore wind has increased the demand for reliable scour protection systems to ensure the long-term stability of turbine foundations. Rip-rap scour protections are widely used to mitigate local scour around monopiles. However, edge scour can develop around the protection perimeter, compromising stability and increasing maintenance costs. Optimising scour protection...

102. Bubble Drag Reduction over a Flat Plate: Operating Envelope, Interfacial-Force Mechanisms, and Multi-Slot Injection

Chen Zhao (Department of Marine Technology, NTNU)

Plenary Contribution

Ship frictional resistance can be reduced by injecting gas beneath the hull, but bubble drag reduction decays downstream injection point through mechanisms that is partly understood. Here, BDR over a ?flat plate is investigated using multiphase model in OpenFOAM-dev, validated against the ?at-plate experiments of Elbing et al. (2008) at three gas injection ?ow rates, Q = 2.55, 4.81 and 9.06...

70. Human-AI-in-the-loop global sensitivity analysis framework for marine engineering systems

Yu Ma (University of Stavanger (UiS))

Paper Contribution

In the life cycle of marine engineering systems, the system performance may differ across different structural and load parameters. To identify the sensitivity, Sobol's global sensitivity analysis (GSA) of the system parameters can be practiced. Possibilty of parameter changes can be quantified and ranked with the Sobol indices decomposed from the total variance. The traditional Sobol's GSA...

69. Kriging-based surrogate optimisation of float geometry for the M4 multibody wave energy converter

Dr David Lande-Sudall (Western Norway University of Applied Sciences)

Paper Contribution

The Moored Multi-Modal Multibody (M4) wave energy converter (WEC) has been developed since 2015. To date, float geometry and arrangements have been assumed based on theoretical assumptions of peak power extraction and mean wavelengths at typical wave energy sites. However, this may lead to suboptimal power capture, particularly for sites with multiple modes of occurrence in energy period and...

111. Multi-body CFD of a laboratory-scale ship-lock analog in REEF3D

Elyas Larkermani (NTNU)

Plenary Contribution

Inland ship locks couple a floating vessel, moving gates and a free-surface filling wave in a confined chamber. Design practice (PIANC; German hawser limits of order 1/600 of displacement) has long relied on physical models. Three-dimensional CFD with a moving ship is already used for lock filling, typically with body-fitted or morphing meshes whose updates dominate the cost. The open-source...

110. Numerical simulations of the OC5-DeepCwind and INO WINDMOOR semi-submersibles with REEF3D::CFD

Dr Ahmet Soydan (Norwegian University of Science and Technology)

Plenary Contribution

Floating offshore wind turbines (FOWTs) couple large-amplitude rigid-body motion, strongly nonlinear free-surface hydrodynamics and mooring line dynamics, and their reliable design requires numerical tools that resolve all three simultaneously. This work presents a numerical framework that demonstrates two semi-submersible platforms with experimental data: the OC5-DeepCwind platform tested at...

101. On the Modeling of Air Lubrication Effects on a Full-Scale Ship Model Using Euler–Euler and Volume-of-Fluid Methods

Adam Pawel Kosinski (1Department of Marine Technology, NTNU)

Plenary Contribution

Air lubrication involves the injection of air beneath a ship’s hull, either as a continuous air layer
(ALDR) or in the form of microbubbles (BDR), to reduce skin-friction drag and thereby improve
the energy efficiency of marine vessels. Though previous computational fluid dynamics (CFD)
investigations have predominantly focused on model-scale vessels or flat-plate geometries,...

100. Separable Physics-Informed Neural Networks for Modelling Flows around a Circular Cylinder near the Plane Wall

Peiqing Zhao (University of Stavanger)

Flows around circular cylinders near a solid boundary exhibit complex interactions between the wake and the wall boundary layer, resulting in significant variations in flow characteristics with the gap-to-diameter ratio. Accurate prediction of such flow fields using conventional computational fluid dynamics (CFD) can be computationally demanding, particularly across different flow regimes and...

109. Simulation of ship-waterway interaction in confined waterways

Dr Leon-Carlos Dempwolff

Plenary Contribution

When a ship navigates confined waters, the surrounding bathymetry alters the flow field around its hull and gives rise to strong ship–waterway interaction. This interaction appears mainly as vertical motion (squat), lateral motion (bank effect), and significant long- and short-period waves. Because long-period waves are reflected at inlets and outlets, they can affect following vessels. Since...

50. Study of cavitation behavior in rigid and flexible hydrofoils

Dr Mariusz Domagala (Western Norway Univeristy of Applied Sciences, Cracow University of Technology)

Paper Contribution

Active blade pitch control systems play a crucial role in maximizing the performance and energy yield of tidal and marine current turbines by continuously adjusting the blade pitch angle in response to changing flow conditions. As an alternative to actively controlled systems, passive load-control strategies have attracted considerable interest due to their mechanical simplicity, lower...