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首页> 外文期刊>Ocean Engineering >Influence of hydrodynamic coefficients in the response behavior of triangular TLPs in regular waves
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Influence of hydrodynamic coefficients in the response behavior of triangular TLPs in regular waves

机译：流体动力系数对规则波中三角形TLP响应特性的影响

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摘要

Triangular configuration tension leg platforms (TLPs) are used for deep-water oil/gas exploration. The mechanics of TLP is highly nonlinear due to larger structural displacements and fluid motion-structure interaction. Triangular TLP has major consideration for deep-water application also due to its relative insensitivity with increasing water depth, excellent station keeping characteristics, etc. which makes this as a most cost effective and practical production system for deep waters. This study focuses on the influence of hydrodynamic drag coefficient (C_d) and hydrodynamic inertia coefficient (C_m) on the nonlinear response behavior of triangular TLP models under regular waves. Two typical triangular TLP models vis-a-vis TLP_1 and TLP_2 are taken for the study at 600 and 1200 m water depths, respectively. Hydrodynamic forces on these TLPs are evaluated using modified Morison equation under regular waves. Diffraction effects are neglected. Various nonlinearities arising due to relative velocity term in drag force, change in tether tension due to TLP movement, and set down effect are being considered in the analysis. The dynamic equation of motion has been solved in time-domain by employing Newmark's β numerical integration technique. Based on the numerical study conducted, it is seen that the response evaluated using varying hydrodynamic coefficients through the water depth is significantly lesser in comparison to the response with constant coefficients in all activated degrees-of-freedom. However, sway, roll, and yaw degrees-of-freedom are not present due to the unidirectional wave loading considered for the study. The influence of hydrodynamic coefficients in wave period of 15 s is more in comparison with that of 10 s, and is nonlinear. The hydrodynamic coefficients also influence the plan dimension of TLP and its site location (geometry). Therefore, it may become essential to estimate the range of C_d-C_m values to vary through the water depth, based on Reynolds number (Re) or Keulegan-Carpenter number (Kc) even before the preliminary design of the TLP geometry.
机译：三角形构造的张紧腿平台（TLP）用于深水石油/天然气勘探。由于更大的结构位移和流体运动-结构相互作用，TLP的力学是高度非线性的。三角TLP还因深水应用相对不灵敏，水深增加，出色的站位保持特性等而成为深水应用的主要考虑因素，这使其成为最经济，最实用的深水生产系统。本研究着重研究水动力阻力系数（C_d）和水动力惯性系数（C_m）对规则波作用下三角形TLP模型非线性响应行为的影响。针对水深分别为600和1200 m的两个典型的三角形TLP模型分别针对TLP_1和TLP_2。使用修正的Morison方程在规则波下评估这些TLP上的流体动力。衍射效应被忽略。分析中考虑了由于阻力中的相对速度项，由于TLP运动导致的系绳张力变化以及下陷效应而引起的各种非线性。通过使用Newmark的β数值积分技术，可以在时域中解决动态运动方程。根据进行的数值研究，可以看出，与在所有激活的自由度中具有恒定系数的响应相比，使用贯穿水深的变化流体力学系数评估的响应要小得多。但是，由于研究中考虑了单向波浪载荷，因此不存在摇摆，滚动和偏航自由度。与10 s相比，在15 s的波浪周期中水动力系数的影响更大，并且是非线性的。流体动力系数也会影响TLP的平面尺寸及其站点位置（几何形状）。因此，甚至在TLP几何的初步设计之前，就必须根据雷诺数（Re）或Keulegan-Carpenter数（Kc）来估计C_d-C_m值的范围以在整个水深中变化，这一点变得至关重要。

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