OC6 Phase Ia: CFD Simulations of the Free-Decay Motion of the DeepCwind Semisubmersible-猫眼课题宝

DOI：

10.3390/en15010389

发表时间：

2022-01

期刊：

Energies

影响因子：

3.2

通讯作者：

中科院分区：

工程技术4区

文献类型：

作者：

Lu Wang;A. Robertson;J. Jonkman;Jang-Whan Kim;Zhi-rong Shen;A. Koop;Adri;Borr;S. Nadal;W. Shi;Xinmeng Zeng;E. Ransley;S. Brown;M. Hann;P. Chandramouli;Axelle Vir;Likhitha Ramesh Reddy;Xiang Li;Q. Xiao;C. Alonso;Sho Oh;H. Sarlak;S. Netzband;Hyunchul Jang;Kai Yu

目前，浮式海上风力发电系统的设计主要基于具有经验拖曳力的中保真度模型。模型系数的调整需要来自实验或高保真模拟的数据。作为OC6（Offshore Code Comparison Collaboration，Continued，with Correlation，and unauthority，OC6）项目的一部分，本研究探讨了后一种选择。对DeepCwind半潜式平台进行自由衰减运动的计算流体动力学（CFD）模型进行了验证和确认研究。几个机构提供了计算流体动力学结果，以验证OC 6实验活动。目的是评估参与者的CFD设置是否可以提供中保真度模型所需的流体动力阻尼系数的有效估计。线性和二次阻尼系数和等效阻尼比被选为验证的指标。大的数值不确定性估计的线性和二次阻尼系数，然而，等效阻尼比更一致的预测较低的不确定性。在实验和计算流体力学波动衰减运动之间观察到一些差异，这是由模拟中未考虑的机械阻尼引起的，可能源于系泊装置，包括库仑摩擦力。总体而言，模拟和实验显示出合理的一致性，从而证明了使用CFD模拟来调整中保真度模型的可行性。

Currently, the design of floating offshore wind systems is primarily based on mid-fidelity models with empirical drag forces. The tuning of the model coefficients requires data from either experiments or high-fidelity simulations. As part of the OC6 (Offshore Code Comparison Collaboration, Continued, with Correlation, and unCertainty (OC6) is a project under the International Energy Agency Wind Task 30 framework) project, the present investigation explores the latter option. A verification and validation study of computational fluid dynamics (CFD) models of the DeepCwind semisubmersible undergoing free-decay motion is performed. Several institutions provided CFD results for validation against the OC6 experimental campaign. The objective is to evaluate whether the CFD setups of the participants can provide valid estimates of the hydrodynamic damping coefficients needed by mid-fidelity models. The linear and quadratic damping coefficients and the equivalent damping ratio are chosen as metrics for validation. Large numerical uncertainties are estimated for the linear and quadratic damping coefficients; however, the equivalent damping ratios are more consistently predicted with lower uncertainty. Some difference is observed between the experimental and CFD surge-decay motion, which is caused by mechanical damping not considered in the simulations that likely originated from the mooring setup, including a Coulomb-friction-type force. Overall, the simulations and the experiment show reasonable agreement, thus demonstrating the feasibility of using CFD simulations to tune mid-fidelity models.

OC6 Phase Ia: CFD Simulations of the Free-Decay Motion of the DeepCwind Semisubmersible

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