Understanding the behaviour of thruster-induced flow in shallow water is essential for offshore and port operations — particularly when assessing seabed interaction, scour, and sediment transport. This article compares the limitations of two-dimensional (2D) modelling with the more comprehensive results obtained from three-dimensional (3D) analysis.
Why It Matters
In 2D modelling, the vertical plane is isolated — omitting horizontal flow components and oversimplifying flow interaction with the seabed. While this approach offers speed and lower computational cost, it fails to capture the full picture of thruster behaviour in confined or complex environments.
3D modelling, on the other hand, captures both vertical and horizontal dynamics, offering a more realistic representation of how flow interacts with seabed topography. This includes the prediction of scour zones, sediment displacement, and threshold of motion values.
Key Findings
2D models underestimate complexity and potential for scour
3D models reveal asymmetric flow distribution and more accurate threshold of motion
Real-world implications for vessel positioning, berthing operations, and asset protection
Engineering Insight
This comparative study demonstrates the value of 3D computational fluid dynamics (CFD) analysis in predicting seabed response and guiding offshore design and operational decisions. RYDER’s advanced modelling capability supports safe, sustainable offshore operations with greater confidence in near-field seabed impact assessments.
Visual Outputs
Figure 1: Contour of velocity – 2D (top) vs 3D (bottom)
Figure 2: Threshold of motion comparison – 2D (green) vs 3D (blue)
Figure 3: Predicted threshold of motion from 3D analysis
Learn More
To discuss how RYDER can support your next marine engineering challenge through high-resolution CFD and seabed interaction modelling, get in touch with our team.