In this tutorial we have seen how we can use the “MacCamy-Fuchs” load formulation for hydrodynamic analysis in AquaSim. Furthermore, we have described the theoretical background, assumptions and validity of this load formulation. Calculation and verification of the added mass and hydrodynamic damping obtained using this load formulation has also been covered.

Lastly a case study was performed, for a vertical circular cylinder with fixed radius and finite length, comparing the total horizontal wave excitation force and corresponding phase, calculated by AquaSim using the “MacCamy-Fuchs” load formulation, the “Numerical diffraction” load formulation and calculations using the analytical long wave approximation (Morison equation with \(C_a=1.0\) and \(C_D=0.0\)) . The results were as expected and showed good agreement.

References

Aquastructures AS. (2024a). The AquaSim Package Theory User Manual. TR-20000-2049-1. Version 2.20.0.

Aquastructures AS. (2025a). AquaSim Training courses. Hydrodynamic analysis in AquaSim using NEMOH. #2112.

Aquastructures AS. (2025b). On numerical calculation of diffraction forces, added mass and hydrodynamic damping. TN-FOU-101830-1. Revision 1.

Aquastructures AS. (2025c). AquaSim Training courses. Tarpaulin closed compartment, inner fluid mass. #2103.

Maccamy, R. C., & Fuchs, R. A. (1954). WAVE FORCES ON PILES: A DIFFRACTION THEORY. CORPS OF ENGINEERS WASHINGTON DC BEACH EROSION BOARD.