On the Coupling of Incompressible SPH with a Finite Element Potential Flow Solver for Nonlinear Free-Surface Flows
On the Coupling of Incompressible SPH with a Finite Element Potential Flow Solver for Nonlinear Free-Surface Flows
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DOI：
10.17736/ijope.2018.ak28
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发表时间：
2018-09
影响因子：
0.8
通讯作者：
G. Fourtakas;P. Stansby;B. Rogers;S. Lind;S. Yan;Q. Ma
中科院分区：
文献类型：
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作者：
G. Fourtakas;P. Stansby;B. Rogers;S. Lind;S. Yan;Q. Ma
提出了一种准任意拉格朗日-欧拉有限元法（QALE-FEM）非线性势流求解器与不可压光滑粒子流体动力学（ISPH）Navier-Stokes方程求解器之间的二维单向耦合方法。非线性势流求解器，如QALE-FEM是高效的求解器，在大的域中传播波;然而，当极端的非线性发生，如破碎，破碎波，和海洋结构物的激烈相互作用，该方法变得无法处理这些流的功能。粒子方法ISPH是已知的，是准确的，这样的高度非线性fragmentized流，并提供近noisefree压力。因此，ISPH是理想的近场流动，涉及翻转，飞溅，砰击。在这里，我们提出了一种单向耦合方法QALE-FEM和ISPH的方法分别用于远场和内部/本地制度。为了验证单向耦合算法，采用了两个正弦波，得到了满意的结果。目的是将这种方法扩展到使用两相（空气-水）求解器的势流求解器与ISPH的强耦合。其目的是可靠地预测极端波浪力和海上结构物（如海洋可再生能源和石油天然气工业的甲板和平台）上的砰击。
This paper presents a two-dimensional, one-way coupling methodology between the quasi-arbitrary Lagrange–Euler finite element method (QALE-FEM) nonlinear potential flow solver and the incompressible smoothed particle hydrodynamics (ISPH) Navier-Stokes equations solver. Nonlinear potential flow solvers such as the QALE-FEM are highly efficient solvers for propagating waves in large domains; however, when extreme nonlinearity takes place, such as fragmentation, breaking waves, and violent interaction with marine structures, the methodology becomes incapable of dealing with these flow features. The particle method ISPH is known to be accurate for such highly nonlinear fragmentized flows and provides near-noisefree pressures. ISPH is thus ideal for near-field flows involving overturning, splashing, and slamming. Herein, we propose a one-way coupling methodology between QALE-FEM and ISPH where the methods are used for the far-field and inner/local regimes, respectively. To validate the one-way coupling algorithm, two sinusoidal waves have been used with satisfactory results. The intention is to extend this approach to the strong coupling of the potential flow solver with ISPH using a twophase (air–water) solver. The aim is to reliably predict extreme wave forces and slamming on offshore structures such as decks and platforms for marine renewable energy and the oil and gas industry.