This study focuses on the calculation and the verification of wave forces acting on large cylindrical offshore structures using CFD. Before starting our simulations regarding large cylinders, experimental results conducted by Chen (2014) are considered in this study. This experimental study is replicated numerically and wave forces acting on this cylinder demonstrated good agreement with the results obtained from CFD simulations plus Morison equation. In addition, wave surface elevations are also compared. It is observed that by means of both wave surface elevations and wave forces, numerical results are in good agreement with experimental results. As the second part of the study, the applicability of Morison equation is tested as the structure starts to experience diffraction forces. In other words, as the cylinder gets larger, it is expected that the applicability of Morison equation will decrease. After the appropriate mesh size is determined, wave forces are obtained for increasing diameters. It is observed that even the cylinder is considered "large", near diffraction zones, Morison Equation may still be applicable since results are in good agreement with Morison equations given in Beji (2019). This study validates the consistency of the analytical solutions with numerical approaches. The results highlight the suitability of the Morison equation to a certain degree. From CFD simulations, it is also possible to calculate wave forces acting on large cylindrical offshore structures which are in diffraction zone as well.

Oral Presentation:
Tunçay, R.Y, & Bayraktar Bural, D. “Numerical Simulation of Wave Forces Acting on Large Cylinders” 4th International Naval Architecture and Maritime Symposium (INT-NAM 2023), İstanbul/TÜRKİYE, 11 October 2023, p. 535-548 

 

Related Staff:
Deniz Bayraktar Bural
Rabia Yağmur Tunçay