Wind load is one of the major design loads for the hull and mooring of offshore floating structures, especially due to much larger windage area above water than under water. By virtue of extreme design philosophy, fully turbulent flow assumption can be justified and the hydrodynamic characteristics of the flow remain almost constant which implies the wind load is less sensitive to the Reynolds number around the design wind speed than wind profile. In the perspective of meteorology, wind profile used for wind load estimation is a part of Atmospheric Boundary Layer (ABL), especially maritime ABL (MBL) and have been studied how to implement the profile without losing turbulence properties numerically by several researchers. In this study, the MBL is implemented using an open source CFD toolkit, OpenFOAM and extended to unstable ABL as well as neutral ABL referred to as NPD profile. The homogeneity of the wind profile along wind direction is examined, especially with NPD profile. The NPD profile was applied to a semi-submersible rig and estimated wind load was compared with the results from wind tunnel test.

风载荷是海上浮式结构的船体和系泊的主要设计载荷之一，特别是由于水上的风程比水下大得多。借助极端的设计理念，可以证明完全湍流假设是合理的，并且流体的水动力特性几乎保持恒定，这意味着在设计风速附近，风荷载对雷诺数的敏感性低于风廓线。从气象学的角度来看，用于风载荷估算的风廓线是大气边界层（ABL），尤其是海上ABL（MBL）的一部分，并且已经有研究人员研究了如何在不损失湍流特性的情况下实现该廓线。在这项研究中，MBL是使用开源CFD工具包实现的，OpenFOAM并扩展到不稳定的ABL以及称为NPD配置文件的中性ABL。检验了沿风向的风廓线的均匀性，尤其是使用NPD廓线时。NPD配置文件应用于半潜式钻机，并将估计的风荷载与风洞试验的结果进行了比较。