Multi-resolution MPS for incompressible fluid-elastic structure interactions in ocean engineering

The paper presents a multi-resolution MPS (Moving Particle Semi-implicit)-based FSI (Fluid-Structure Interaction) solver for efficient and accurate simulations of incompressible fluid flows interacting with elastic structures. The fluid model is founded on the projection-based MPS solution of continuity and Navier-Stokes equations. The structure model is set based on MPS-based discretization of linear and angular momenta corresponding to an isotropic elastic solid. Fluid-structure coupling is conducted in a mathematically-physically consistent manner along with implementation of a multi-resolution scheme comprising of common radius of influence, revised weight function, revised number density and potential number density concepts to enhance i) consistency of particle-based discretizations, ii) imposition of boundary conditions and iii) volume conservation at fluid-structure interface. A set of previously developed enhanced schemes are also adopted for the fluid model. The robustness and efficiency of proposed Enhanced Multi-resolution MPS-MPS FSI solver are investigated through a set of ocean engineering-related benchmark tests. To the best knowledge of authors, this study presents the first multi-resolution particle method for FSI corresponding to incompressible fluid and elastic structures.     

不同雷诺数下倾斜圆柱绕流三维数值模拟研究

基于计算流体力学(CFD)开源代码OpenFOAM开展了不同雷诺数(Re=100、1500和3900)和倾斜角度(-60°≤α≤60°)工况下倾斜圆柱绕流流场的三维数值模拟,研究倾斜圆柱绕流的三维瞬时及时均尾流流场、流线拓扑、升阻力系数与旋涡脱落频率随雷诺数及倾斜角度变化的规律,探讨在顺流向及逆流向情况下独立性原则对倾斜圆柱绕流的适用性。研究结果表明:随着圆柱倾角的增大,倾斜圆柱尾流产生较为明显的轴向流,尾流旋涡脱落受到明显抑制,细碎旋涡逐渐消失,尾流宽度随之减小;随着雷诺数的增大,圆柱尾流涡管发生明显的变形,展向掺混使得大量细碎旋涡产生,呈现出明显的三维特性。在不同雷诺数下,阻力系数均值、升力系数均方根及无量纲涡脱频率在一定倾角范围内符合独立性原则。