ABSTRACT

Hydrodynamic coefficients of subsea manifolds are significant parameters in predicting dynamic responses during deep-water installation. To calculate these coefficients, a series of model tests of the drag coefficients of a typical subsea manifold with eight slots were carried out at Zhejiang University. A numerical simulation was performed using the computational fluid dynamics (CFD) method, and the Navier–Stokes equations were solved to obtain the drag and added mass coefficients. On the prediction of drag coefficient, a similar tendency was found for both the numerical and experimental results, proving the accuracy and reliability of the proposed CFD method. The effects of variables such as the Keulegan-Carpenter (KC) number and frequency of forced oscillation on the added mass coefficients were analysed. The added mass coefficients increase nearly linearly as the KC number increases, but the oscillation frequency has little influence on the added mass coefficients.

摘要

海底歧管的水动力系数是预测深水安装过程中动态响应的重要参数。为了计算这些系数，浙江大学对典型的八槽海底管汇的阻力系数进行了一系列模型试验。使用计算流体动力学 (CFD) 方法进行数值模拟，并求解 Navier-Stokes 方程以获得阻力和附加质量系数。在阻力系数的预测上，数值和实验结果都发现了相似的趋势，证明了所提出的 CFD 方法的准确性和可靠性。分析了诸如 Keulegan-Carpenter (KC) 数和强迫振荡频率等变量对附加质量系数的影响。