Simulating water-entry/exit problems using Eulerian-Lagrangian and fully-Eulerian fictitious domain methods within the open-source IBAMR library
Simulating water-entry/exit problems using Eulerian-Lagrangian and fully-Eulerian fictitious domain methods within the open-source IBAMR library
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DOI：
10.1016/j.apor.2019.101932
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发表时间：
2020-01-01
影响因子：
4.3
通讯作者：
Mattiazzo, Giuliana
中科院分区：
文献类型：
--
作者：
Bhalla, Amneet Pal Singh;Nangia, Nishant;Mattiazzo, Giuliana
在本文中，我们采用两种实现的虚拟域（FD）的方法来模拟入水和出水问题，并证明他们的能力，以模拟实际的海洋工程问题。在FD方法中，流体动量方程在固体域内使用附加的体积力来扩展，该体积力将结构速度约束为刚体速度。使用这个公式，在整个计算域上求解一组方程。约束力的计算有两种不同的方法：一种是使用浸没边界（IB）方法的欧拉拉格朗日框架，另一种是使用布林克曼惩罚（BP）方法的完全欧拉方法。两种FSI策略都使用相同的多相流算法，该算法以保守形式求解离散不可压缩Navier-Stokes系统。采用一致的输运格式对区域内的质量和动量进行平流，保证了海洋工程实际应用中高密度比多相流的数值稳定性。对自由下落的楔形体（直的和倾斜的）和圆柱体的例子进行了模拟，并将数值结果与文献中的基准情况进行了比较。
In this paper we employ two implementations of the fictitious domain (FD) method to simulate water-entry and water-exit problems and demonstrate their ability to simulate practical marine engineering problems. In FD methods, the fluid momentum equation is extended within the solid domain using an additional body force that constrains the structure velocity to be that of a rigid body. Using this formulation, a single set of equations is solved over the entire computational domain. The constraint force is calculated in two distinct ways: one using an Eulerian Lagrangian framework of the immersed boundary (IB) method and another using a fully-Eulerian approach of the Brinkman penalization (BP) method. Both FSI strategies use the same multiphase flow algorithm that solves the discrete incompressible Navier-Stokes system in conservative form. A consistent transport scheme is employed to advect mass and momentum in the domain, which ensures numerical stability of high density ratio multiphase flows involved in practical marine engineering applications. Example cases of a free falling wedge (straight and inclined) and cylinder are simulated, and the numerical results are compared against benchmark cases in literature.