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首页> 外文期刊>Ocean Engineering >3D numerical modelling of scour around a jacket structure with dynamic free surface capturing
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3D numerical modelling of scour around a jacket structure with dynamic free surface capturing

机译：3D动态自由表面捕获的夹克结构周围的数值模型

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摘要

This paper presents a numerical investigation of local scour with dynamic free surface capturing around a jacket structure. The hydrodynamics and resulting scour are calculated using the open-source CFD model REEF3D. The model solves the Reynolds-averaged Navier-Stokes equations with k - omega turbulence closure. The free surface is captured with the level set method. The simulated flow hydrodynamics are coupled with sediment transport algorithms. The modelling of the local scouring process is based on the bed load and the suspended load while accounting for the bed slope for the calculation of the critical bed shear stress. In order to obtain a more realistic prediction of the scour hole, a sand-slide algorithm is implemented to correct the bed slope when it exceeds the angle of repose. The grid and lime step size convergence tests are performed to ensure the quality of the simulated hydrodynamics in the numerical wave tank (NWT). The model is validated for local scour around a pile in an experimental flume using different values of Keulegan-Carpenter number (KC). The results show a good agreement with the experimental data. The validated model is applied to simulate scour around a jacket structure. The key findings from the study are the modelling of flow hydrodynamics and the lime development of local scour around a jacket exposed to waves and steady current.
机译：本文介绍了局部冲刷的数值调查，具有夹套结构的动态自由表面。使用开源CFD Model Reef3D计算流体动力学和产生的冲刷。该模型解决了具有K - Omega湍流闭合的雷诺平均的Navier-Stokes方程。使用电平设置方法捕获自由表面。模拟流动流体动力学与沉积物传输算法耦合。局部冲洗过程的建模基于床负荷和悬浮载荷，同时占床斜率以计算临界床剪切应力。为了获得更真实的冲刷孔预测，在超过休息角时，实现了砂滑动算法以校正床斜率。进行电网和石灰级级收敛试验以确保数值波罐（NWT）中的模拟流体动力学的质量。使用不同价值的keulegan-carpenter数（KC）在实验水槽中验证该模型。结果表明，与实验数据吻合良好。验证的模型应用于模拟夹克结构周围的冲刷。该研究的主要发现是流动流体动力学的建模和局部冲刷的局部冲刷暴露于波浪和稳定电流的灰色开发。

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