Thesis
Predicting the effects of fouling control coatings and heterogeneous hull roughness on ship resistance
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2023
- Thesis identifier
- T16679
- Person Identifier (Local)
- 201986604
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- This research builds on one of the spotlights of fluid-hull interaction theories: the effects of hull surface conditions on ship hydrodynamics.Several factors, such as biofouling accumulation, coatings failure, and corrosion, deteriorate the hull surfaces (i.e., increasing the hull roughness). Although the consequences of poor hull surface conditions on fuel consumption and emissions are well-known, the rationales behind the hull roughness effects on ship performance are yet to be thoroughly understood. Furthermore, there is epistemic uncertainty associated with biofouling management strategies (e.g., the choice of fouling control coatings and drydocking operations). Last but not least, although hull roughness is typically spatially heterogeneous, most research has only dealt with homogeneously distributed hull roughness. Therefore, given the importance of hull roughness on ship performance from economic and environmental perspectives, this thesis aims to investigate the effects of fouling control coatings, mimicked biofouling and heterogeneous hull roughness on ship hydrodynamics using experimental and numerical methods.Part I (Chapters 4 and 5) of the thesis presents experimental roughness function data for different surfaces, including a hard foul-release coating developed from the fully turbulent flow channel (FTFC) facility of the University of Strathclyde. Furthermore, the results of the FTFC tests were compared against flat plate towing tank tests showing excellent agreement. Afterwards, Part II (Chapter 6 and 7) employed the experimental results in similarity law scaling and Computational Fluid Dynamics (CFD) analysis for full-scale predictions at different speeds. Notably, more than one of the paints tested showed a reduction in the estimated effective power requirements (i.e., up to 5.7%). Finally, Part III (Chapter 8) extended the CFD analysis to the effects of the heterogeneous distribution of hull roughness on ship resistance by simulating heterogeneous scenarios with various hull forms, and speeds. Eventually, the results were correlated by defining a Roughness Impact Factor (RIF) which could have practical implications for biofouling management decisions.
- Advisor / supervisor
- Tezdogan, Tahsin
- Demirel, Yigit Kemal
- Resource Type
- DOI
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PDF of thesis T16679 | 2023-08-23 | Public | Download |