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首页> 外文会议>25th International Conference on Offshore Mechanics and Arctic Engineering 2006(OMAE2006) vol.4 >Numerical Investigation of the Unsteady Flow at High Reynolds Number over a Marine Riser with Helical Strakes
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Numerical Investigation of the Unsteady Flow at High Reynolds Number over a Marine Riser with Helical Strakes

机译：高螺线管海底上升管高雷诺数非定常流动的数值研究

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Prediction of Vortex-Induced Vibrations (VIV) is one of the main topics in the design of deepwater risers. The understanding and modelling of the complex fluid-structure interaction requires advanced analysis techniques coupling, in a correct manner, both structural and fluid dynamics aspects. This study aims to develop, optimise and calibrate a numerical code to provide reliable results within a reasonable analysis timeframe and without, or very limited, need of experimental verification. For this purpose, the unsteady Reynolds Average Navier-Stokes (RANS) code Xnavis is applied to solve a typical riser VIV problem and compute the three-dimensional riser-fluid dynamics interaction. During a preliminary analysis phase, the two-dimensional (2-D) flow past (ⅰ) a bare circular cylinder and (ⅱ) a straked riser at high Reynolds numbers is simulated (different incidences flow/stake vanes are analysed). Numerical results are validated and calibrated against published test data. The core analysis phase is then focused on the numerical investigation of the unsteady flow over a three-dimensional (3-D) helical strake. In this phase, the three-dimensional flow field, turbulent structures and response frequency patterns are analysed. Spectral analysis of data is performed to identify carrier frequencies deemed to be critical due to the induced vibration of the whole structure, and helical strakes efficiency in reducing the riser vibrations is also addressed. Finally, comparison between numerical and experimental results shows that the complexity of a three-dimensional model is indeed compensated by a significantly improved accuracy of the obtained results.
机译：涡激振动（VIV）的预测是深水立管设计的主要主题之一。对复杂的流体-结构相互作用的理解和建模需要先进的分析技术以正确的方式耦合结构和流体动力学方面。这项研究旨在开发，优化和校准数字代码，以在合理的分析时间内提供可靠的结果，而无需或非常有限地需要实验验证。为此，将不稳定的雷诺平均纳维-斯托克斯（RANS）代码Xnavis应用于解决典型的立管VIV问题并计算三维立管-流体动力学相互作用。在初步分析阶段，模拟了在高雷诺数下通过（ⅰ）裸圆柱和（ⅱ）立管的二维（2-D）流动（分析了不同的入射流/立管叶片）。数值结果将根据发布的测试数据进行验证和校准。然后，岩心分析阶段将重点放在三维（3-D）螺旋形风道上非定常流动的数值研究上。在此阶段，分析了三维流场，湍流结构和响应频率模式。进行数据的频谱分析以识别由于整个结构的感应振动而被认为是至关重要的载波频率，并且还解决了降低提升管振动的螺旋线效率。最后，数值结果和实验结果之间的比较表明，三维模型的复杂性确实得到了明显提高的结果精度的补偿。

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